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 UnocAl 7455 Redwood Blvd Novato CA Gasoline Other Groundwater (Uses Other Than Drinking Water) The Site Is Located At 7455 Redwood Boulevard, South Of The Olive Street Intersection, In Novato, CAlifornia. The Site Is Bounded On The North By A Shell Branded Retail Fueling Station, On The West By A Self-Service CAr Wash Facility, To The South By Commercial-Retail Properties, And To The East By The Frontage Road Accessed From Redwood Boulevard. The Site Operated As A UnoCAl Service Station From Approximately 1953 To 1992. In 1982, Three Steel Gasoline USTs (One 6,000-Gallon, One 4,000-Gallon, And One 3,000-Gallon) Were Removed. The Three USTs Were Replaced With Two 12,000-Gallon Fiberglass Gasoline USTs. A 550- Gallon Waste Oil Tank Was Also Installed In 1982. UnoCAl Ceased Operations At The Site In January 1992 And Removed The Two 12,000-Gallon Fuel USTs, 550-Gallon Waste Oil Ust, And Associated Piping And Dispensers. The Site Was Subsequently Occupied By An Automotive Repair Facility And Moving Truck And Trailer Rental Center. Two Hydraulic Hoists, A Parts Storage Area, And A Restroom And Office Were Located In The Former UnoCAl Service Station Building. Two Truck Hoists Were Located North Of The Service Station Building. The Site Is Currently Unoccupied. There Are Currently 11 Active Groundwater Monitoring Wells Associated With The Site. The Site Is Located In An Area Zoned Commercial And The Properties Surrounding It Are Zoned A Mixture Of Commercial And Residential.The Site Land Use Will Remain Commercial. (05/29/2015 Additional Soil Vapor Investigation Work Plan) Tank Closure Prosperity Cleaners 187 Marinwood Ave. San Rafael CA Acetone, Dichloroethene (Dce), Tetrachloroethylene (PCE), Trichloroethylene (TCE), Vinyl Chloride Aquifer Used For Drinking Water Supply, Indoor Air, Other Groundwater (Uses Other Than Drinking Water), Soil, Soil Vapor The Subject Property (Site) Is Located In The Marinwood Plaza Shopping Center And Is A Known Source Of Tetrchloroethene (PCE) Release To The Environment. The Vocs Methyl Tert Butyl Ether (Mtbe) And PCE Were Detected At Concentrations Of 0.5 Ug/L And 0.58 Ug/L, Respectively, In The Well Water Sample. The Concentrations Of Mtbe And PCE Reported In The Well Water Sample Are Well Below Their Respective Table A Environmental Screening Levels (Esls) Of 5 Ug/L. Mtbe And PCE Have Not Previously Been Detected In Samples Collected From The On-Site Well. The Vocs PCE, TCE, Cis-1,2-Dce, Trans-1,2-Dichloroethene (Trans-1,2-Dce), And Vinyl Chloride Were Detected At Concentrations Ranging From 4.8 To 2,000 Micrograms Per Kilogram (Ug/Kg) In Soil Samples Collected Near The Eastern Hot Spot Area In December 2010, Compared To Concentrations Ranging From 5.8 To 16,000 Ug/Kg In The Same Area Before Treatment. However, PCE Concentrations In 7 Confirmation Samples Still Exceeded The Residential Land Use Direct Exposure Esl Of 370 Ug/Kg, And, The PCE Concentration (2,000 Ug/Kg) In One Soil Sample (C-1 At 5 Ft) Also Exceeded The Commercial / Industrial Land Use Direct Exposure Esl Of 950 Ug/Kg. In Addition, The Vinyl Chloride Concentration (30 Ug/Kg) In One Confirmation Soil Sample (C-6 At 10 Ft) Exceeded The Residential Land Use Direct Exposure Esl Of 22 Ug/Kg. None Of The Detected Voc Concentrations In Soil Samples Collected At The 15 Ft Depth Exceeded The Rwqcb Direct Exposure Esls For Deeper Soil (Greater Than 3 Meter Depth). Also, Consistent With Previous Sampling Events, No Other Vocs Were Detected In Soil Samples Collected In This Area. Confirmation Sampling Was Not Conducted Inside The Dry Cleaner Following The Oxidizer Injection Conducted In Two Borings Completed In September 2010. However, Previous Sampling Data IndiCAte That Voc Concentrations May Exceed Esls For Direct Exposure Over An Area Of Approximately 600 Sf And Esls For Prevention Of Leaching To Groundwater Over Two Regions Totaling Approximately 650 Sf Inside The Dry Cleaner. Site Assessment/Site Investigation Other Means Dry Cleaner No Longer Operates There NiCAsio Corporation Yard 5600 NiCAsio Valley Rd NiCAsio CA Diesel Other Groundwater (Uses Other Than Drinking Water) Site Is Occupied By Marin County Dept. Of Public Works And Is About 0.9 Miles North Of The Town Of NiCAsio. Seasonally Creeks Are Located Immediately East Of The Site. A Seasonal Creek Is Located 230 Feet Sw Of The Former Ust And Eventually Drains Into NiCAsio Reservoir, A Drinking Water Reservoir. Currently, Two On-Site Water Supply Wells Are Located Within 500 Feet Of The Former USTs, One Of Which Is Not In Service. Ws-1, The In Service Water Supply Well, Pumps Groundwater (Gw) Into A 10,000 Gallon Holding Tank For Distribution Through The Corporation Yard. Water From This System Is Designated Non-Potable And Signs Are Affixed To The Faucets. Based On The Following, CAse Closure For This Site As A Low Risk Soil And Groundwater CAse Is Considered To Be Appropriate: (1) The Primary Sources (One 4000 Gallon Gasoline And One 10,000-Gallon Diesel Ust) Have Been Removed. Free Product Was Pumped From The ExCAvation At The Time Of Ust Removal And Disposed. Approximately 1300 Cubic Yards Of Impacted Soils Were Over-ExCAvated And Transported Offsite; Fhc-Impacted Soils Have Been Removed To The Extent PractiCAble And Confirmation Soil Samples IndiCAte Low Residual Concentrations. (2) The Site Has Been Adequately Characterized. Sensitive Receptors And Migration Pathways That Could Be Impacted By The Release Have Been Identified. (3) The Dissolved Fhc Plume Is Primarily Mtbe And Is Not Migrating As Evidenced By Low (<5 µg/L) Stable Concentrations In Mw-7, Low (<3 µg/L) Stable To Declining Concentrations In Mw-4 And Mw-5 And Declining Concentrations In Mw-2 And Mw-6. Mtbe Concentrations In Mw-2 And Mw-6 Should Decline To Below The Esl Of 5.0 µg/L Sometime During 2011. Fhcs Other Than Mtbe In Groundwater Are Constrained To A Limited Area In The Immediate Vicinity Of The Former USTs. Btex Compounds In Groundwater Appear To Have Degraded Below Their Reporting Limits. (4) No Water Wells, Deeper Drinking Water Aquifers, Surface Water, Or Other Sensitive Receptors Have Been Impacted Or Are Likely To Be Impacted From The Release From The Former USTs. The Srs Did Not Identify Any Municipal Water Wells Within 2000 Ft Of The Site. Deeper Aquifers Are Not Likely To Be Impacted By The Release BeCAuse Bedrock Is Shallow In The Area Of The Release, And Mtbe Is Not Likely To Migrate VertiCAlly In The Absence Of Draw-Down Created By Water Wells. The Nearby Environmental Sensitive Receptor Of Concern Is NiCAsio Reservoir. This Receptor Is Not Likely To Be Impacted By The Release BeCAuse The Groundwater Plume Is Stable And Cross Gradient From The Lake. Water Samples From The On-Site Water Supply Well, The NiCAsio School Drinking Water Well, And (5) There Is Not A SignifiCAnt Risk To Human Health Or The Environment. There May Be A Small Risk To Human Health That Would Be Easily Manageable If ExCAvations Extend To Below The Water Table In The Near Vicinity Of The LoCAtion Of The Former USTs. The Potential Risk Could Be Mitigated By Preparing A Soil And Groundwater Management Plan (Sgmp). The Sgmp Would Describe Procedures To Notify The Appropriate Regulatory Agencies, Protect Worker?S Health, And Manage Impacted Soil And/Or Groundwater If It Is Encountered. (6) Btex Appears To Be Absent From Soil And Groundwater, Precluding A Potential Vapor Intrusion Problem. (7) The Residual Concentrations In The Soil And Groundwater Apparently Do Not Represent A Current Or Future Public Health, EcologiCAl, And Water Resources Threat. Tank Closure UnoCAl 679 Blithedale Ave E Mill Valley CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Testa Plumbing 4244 Redwood Hwy San Rafael CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Chuck Collingwood's Automotive 625 Del Ganado San Rafael CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Ust Removal Due To 98 Uogrades. Close And Remove Tank Chevron 949 Del Presidio Blvd San Rafael CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure St Anselm's Church 27 Mariposa Ave San Anselmo CA Heating Oil / Fuel Oil Soil Tank Closure UnoCAl 929 Del Presidio Blvd San Rafael CA Waste Oil / Motor / Hydraulic / LubriCAting Other Groundwater (Uses Other Than Drinking Water) Tank Closure Novato Fire Station #4 319 Enfrente Rd Novato CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Marin Surplus Marin Outdoors 49 Simms St San Rafael CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Pg&E Former Substation - Kentfield 925 - 929 Sir Francis Drake Blvd Kentfield CA Arsenic Soil Subsurface Monitoring Fairfax Gas 2001 Sir Francis Drake Blvd Fairfax CA Waste Oil / Motor / Hydraulic / LubriCAting, Gasoline Other Groundwater (Uses Other Than Drinking Water) Pump & Treat From French Drain Started 10/20/2007, Very Low Yield. Other Means Close And Remove Tank Warren Security Systems 1305 East Francisco Blvd San Rafael CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Other Means AnalytiCAl Results Close And Remove Tank Kimber Management Company 30 Liberty Ship Way Sausalito CA Diesel Other Groundwater (Uses Other Than Drinking Water) CAse Closure For This Site Is Appropriate BeCAuse (1) The Site Has Been Adequately Characterized. Installation Of 39 Soil Borings And 23 Monitoring Wells (Mws), And 8 Years Of Quarterly Groundwater (Gw) Monitoring Delineated The Extent Of Measurable Product (Highly Weathered Diesel/Fuel Oil), Petroleum-Impacted Soil, And Dissolved Petroleum Constituents In Gw; (2) Appropriate Corrective Action, Including Appropriate Source Removal, Was Performed. The USTs Were Removed In 2000, And 573 Tons Of Petroleum-Impacted Soil Were Disposed Of Offsite. The Thickness Of Measurable Product In Monitoring Wells Has Been Reduced By Multiple Types Of Product Recovery Efforts (Vacuuming, Peristaltic Pumping, Adsorbent Socks). Measureable Product Or Sheen Is Currently Found At Some Of The Mws. Pursuant To Ccr Title 23, Division 3, Chapter 16, Section 2655, Free Product Must Be Removed To The Maximum Extent PractiCAble. Section 2655(C) States: ?Abatement Of Free Product Migration Shall Be The Predominant Objective In The Design Of The Free Product Removal System?. Although Measurable Product Still Remains In Several Wells At The Site, The Product Is Not Migrating, Additional Remedial Alternatives Are Infeasible, And Thus The Product Has Been Removed To The Maximum Extent PractiCAble. Further, The Product That Remains At The Site Is Highly Weathered Diesel/Fuel Oil That CAn No Longer Be Considered A ?Source? To Gw BeCAuse Soluble Constituents Are Not Dissolving Out Of The Product At Concentrations Above AppliCAble Wqos. (3) Affected Gw Is Limited In Extent. The Impacted Gw Area Is Completely Surrounded By Mws That Have No Detections Of Dissolved Petroleum Constituents. Therefore, The Affected Gw Is Limited In Extent To A Small Area That Is Coincident With The Area Of Measurable Lnapl; (4) The Plume Is Stable Based On Eight Years Of Groundwater Monitoring. The Affected Gw Already Meets AppliCAble Wqos. The Impacted Gw Is Completely Surrounded By Wells With No Detections Of Dissolved Petroleum Constituents. Monitoring Data IndiCAte That Intrinsic Biodegradation Is Active In Site Gw. This Is A ?Shrinking Plume,?; (5) Drinking Water Wells, Or Other Sensitive Receptors (Such As The Bay), Are Not Located Close To The Plume Or Are Unlikely To Be Impacted. Gw Beneath The Site Is Not A Drinking Water Source Due To High Total Dissolved Solids (Tds). The Sensitive Receptor At This Site Is Richardson Bay, About 175 Feet From Mw-12, Which Is The Closest Well With Measurable Product. Between The Area Of Measurable Product And The Bay, The Gw Either Contains No Detectable Dissolved Petroleum Constituents Or Meets Wqos. There Is No Dissolved Plume Migration From The Site Toward The Bay. Therefore The Plume Poses No Risk To The Bay; (6) The Beneficial Use Of Gw Will Be Restored Before The Resource Is Needed. Gw Beneath The Site Is Not A Probable Source Of Drinking Water Due To High Tds. Beneficial Use Of Site Gw Is Recharge To The Bay; Therefore, AppliCAble Wqos Are The Esls For Marine Aquatic Protection. Natural Attenuation Has Already Restored The Beneficial Use Of Site Gw BeCAuse AppliCAble Wqos Are Met; And (7) Impacted Gw Is Shallow And Within The Depth Limits Of Surface Seal Protection Required By LoCAl Well Construction Requirements. The Residual Lnapl And Impacted Gw Are Very Shallow (About 4 To 10 Feet Below Ground Surface). The State?S Minimum Well Seal Depth Requirement Is 20 Feet. To Eliminate Any Uncertainty That Impacted Groundwater Would Be Used At The Site In The Future, Or That The Natural Hydrogeologic Conditions Could Be Changed Substantially By A Pumping Well, Deed Restrictions Have Been Recorded For 30 Liberty Ship Way And 76 Liberty Ship Way (Deed Restrictions Numbers 2011-0039596 And 2011-0039595, Both Dated June 24, 2011, And Recorded On August 10, 2011) That Prohibits The Installation Of A Well For Any Purpose. Tank Closure East Fort Baker - Bldg. 623 Sausilito CA Mobil 1535 Sir Francis Drake Blvd San Anselmo CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Arroyo Corte Madera 181 Miller Ave Mill Valley CA Harris Property 171 3rd St San Rafael CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Ciampi Distributing 90 Hill Rd Novato CA Gasoline Under Investigation Tank Closure Safeway 700 B St San Rafael CA Polychlorinated Biphenyls (Pcbs), Other Petroleum Other Groundwater (Uses Other Than Drinking Water), Soil Other Means Marin Color Service 770 2nd St San Rafael CA Diesel Other Groundwater (Uses Other Than Drinking Water) Tank Closure Rab Motors/CAltrans 440 Francisco Blvd. West San Rafael CA Diesel, Waste Oil / Motor / Hydraulic / LubriCAting, * Metals Under Investigation Shell 950 Del Presidio Blvd San Rafael CA Gasoline, Waste Oil / Motor / Hydraulic / LubriCAting Other Groundwater (Uses Other Than Drinking Water) Tank Closure Larkspur Ferry Terminal East Sir Francis Drake Blvd Larkspur CA Diesel Soil Ghilotti; Barbara Fasken Trust 200 Morphew Street San Rafael CA Gasoline Under Investigation Tank Closure U Haul 708062 1205 Francisco Blvd E San Rafael CA Gasoline, Waste Oil / Motor / Hydraulic / LubriCAting Soil Tank Closure Texaco 200 San Marin Dr Novato CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure East Fort Baker - Bldg 651 651 Mcreynolds Rd. Sausalito CA Shell 5821 Nave Dr Novato CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Mill Valley City Of 10 Blithedale Ave E Mill Valley CA Gasoline Soil Tank Closure UnoCAl 930 Sir Francis Drake Blvd. San Anselmo CA Diesel, Gasoline Other Groundwater (Uses Other Than Drinking Water) The Site Is An Operating 76-Branded Retail Gasoline Service Station In A Mixed Commercial And Residential Area Of San Anselmo. Five Soil Borings Were Advanced On September 13, 2007. Soil Samples From The Borings Contained Low To Non-Detectable (Nd) Concentrations Of Tph-G, Tph-D, Vocs (Including Btex), And Fuel Oxygenates. However, Grab Groundwater (Gw) Samples From The Borings Contained Up To 17,000 Ppb Of Tph-G, 82,000 Ppb Of Tph-D, 14 Ppb Of Mtbe, And Non-Detectable (Nd) Concentrations Of Benzene. In October 2008 Six Monitoring Wells Were Installed At The Site (Screened Mostly Between 9 ? 19 Or 7 ? 20 Feet Btoc). Soil Samples From The Monitoring Well Borings Contained Low Or Nd Concentrations Of Tph-G, Tph-D, Btex, Mtbe, Other Oxygenates, 1,2-DCA, Edb, And Ethanol. Three Rounds Of Gw Samples From The Monitoring Wells Contained Low Or Nd Concentrateons Of Tph-G, Tph-D, Btex, Mtbe, Other Oxygenates, 1,2-DCA, Edb, And Ethanol. Based On The Following, CAse Closure For This Site Is Considered To Be Appropriate: (1) The Site Is Adequately Characterized; (2) Little Or No Groundwater Impact Currently Exists And No Contaminants Are Found At Levels Above Established Mcls Or Other AppliCAble Water Quality Objectives; (3) No Water Wells, Deeper Drinking Water Aquifers, Surface Water, Or Other Sensitive Receptors Are Likely To Be Impacted; And (4) The Site Presents No SignifiCAnt Risk To Human Health And The Environment. Site Assessment/Site Investigation Uscg Unknown Pt Bonita Point Bonita CA Diesel Soil Tank Closure East Fort Baker - Bldg 646 646 Behind Yacht Club Sausalito CA Greenbridge Gas & Auto 11401 State Rt 1 Point Reyes Station CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Mobil UnoCAl 631 Sir Francis Drake Blvd San Anselmo CA Diesel Other Groundwater (Uses Other Than Drinking Water) Tank Closure Adrian Pump Station 605 Adrian Wy San Rafael CA Waste Oil / Motor / Hydraulic / LubriCAting Other Groundwater (Uses Other Than Drinking Water) Tank Closure Chevron 1549 Novato Blvd S Novato CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Marin Muni Water District 220 Tamal Vista Blvd Corte Madera CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Arco # 02135 440 3rd St San Rafael CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Arco # 00524 789 Old Redwood Hwy Mill Valley CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Cert Ranch 5935 Red Hill Rd Petaluma CA Gasoline Soil Tank Closure Texaco 1660 Tiburon Blvd Tiburon CA Gasoline Other Groundwater (Uses Other Than Drinking Water) The Site Currently Consists Of An Approximately 12,000 Square-Foot Two-Story Office Building That Was Constructed In 1980. A Former Texaco-Branded Service Station Operated At The Site From Approximately 1957 To 1977. In 1970, Three Underground Storage Tanks (USTs; First Generation) Were Replaced With Fiberglass Tanks And An Additional 6,000-Gallon Ust Was Installed (Second Generation). In April 1977, The Service Station Was Demolished And The Four USTs Were Emptied And Removed From The Site (Pacific Northwest Environet Group, Inc. [Environet], 1999). The Site Was VaCAnt From April 1977 Until Construction Of The Office Building In 1980. An Underground Storage Tank Unauthorized Release (Leak)/Contamination Report Was Completed On January 1, 1998. The Report Stated That An Unknown Amount Of Gasoline Was Released Into The Subsurface And Was Discovered During Phase I And Phase Ii Environmental Site Assessments Conducted By Pes Environmental, Inc. Subsurface Monitoring H & W Precision Engineering 1281 Andersen Dr San Rafael CA Gasoline Under Investigation Tank Closure Hamilton Aaf (Incl. Lf#26) - Hamilton Aaf - Landfill 26 1 Burma Road Novato CA Hamilton Army Airfield Consists Of Approximately 1,600 Acres And Was Acquired By The Army Corps In 1932. The Site Was Initially Constructed As A Bomber Installation, But Was Later Transformed Into A Fighter Base As The Bomber Aircraft BeCAme Too Large To Land On Existing Runway. Other Uses Included A Transportation Aircraft Airfield And Flight Training Facility, Industrial Purposes, Petroleum And Jet Fuel Storage, Storage Warehouses, Fuel Distribution Lines. The Site Was Transferred To The U.S. Air Force In 1947. In 1974, The Department Of Defense Declared The Base Surplus. Over The Years, Portions Of The Base Were Transferred To The Navy, Army, General Services Administration (Gsa), The Coast Guard, The State Of CAlifornia And Private Developers. All Gsa Property Has Been Transferred For LoCAl Or Private Development Except For The Landfill. The Landfill, Owned By The U.S. Army Corps, Is Approximately 26 Acres In Size And Was Used As A Disposal Area From The 1940s To The 1970s. It Received Approximately 171,000 Cubic Yards Of Solid Waste, Including Both Hazardous And Nonhazardous Substances, Approximately 20,000 Cubic Yards Of Oily Sludge, And Some Construction Waste. A Resource Conservation And Recovery Act-Type CAp Was Installed Between 1994 And 1995 Pursuant To A Record Of Decision Signed In 1989. Recent Investigations Of The Landfill Have Been For The Migration Of Landfill Gases, Primarily Methane Offsite. A Vent Trench, (Interim Remedy), Was Installed In 2003, At The South And Southeastern Portion Of The Landfill To Prevent Migration Of Methane Gases To The Adjacent Residential Area, Hamilton Meadows. In Addition, The Developer Of The Residential Subdivision Voluntarily Installed Mitigation Measures (Sub-Slab Passing Venting And Passive Membranes) In Homes Where Previous Elevated Hits Of Methane Were Detected In Soil Gas. CoCA Cola Enterprise 265 Bel Marin Keys Blvd Novato CA Diesel Soil Asphalt Degradation Other Means Nozzle Was Shut Off East Fort Baker - East Fort Baker Facility Wide Sausalito CA Strawberry Chevron Food Mart 580 Redwood Highway Mill Valley CA Diesel, Gasoline Soil The Strawberry Chevron Food Mart Station Is Located On The Eastern Side Of Redwood Highway Approximately 600 Ft North Of De Silva Island Drive In Mill Valley, CAlifornia. The Site Is Developed With Fueling Facilities And A Mini-Mart, And Is Paved With Asphalt And Concrete. Land Use Surrounding The Site Is Commercial With A Residential Development Located Approximately 500 Ft Southeast Of The Site. The LoCAl Topography Slopes Gently To The East Towards Strawberry Marsh/Richardson Bay. In April 1988, Four Site Underground Storage Tanks (USTs) (One 3,000-Gallon Gasoline Tank, Two 6,000-Gallon Diesel Tanks And One 3,000- Gallon Waste Water Tank According To The County) Were Filled With A Sand/Concrete Mixture And Closed-In-Place In The Southern Portion Of The Site. In 2007, The Four Filled-In-Place USTs Were Removed. During ExCAvation Of The Old Tanks, Approximately 800 Tons Of Petroleum-Impacted Soil Was Removed And Disposed Of Offsite At Landfills. Tank Closure Close And Remove Tank, Remove Contents Shamrock Peugeot 375 Miller Ave Mill Valley CA Diesel Other Groundwater (Uses Other Than Drinking Water) Tank Closure Proshop Inc. 658 Irwin Street San Rafael CA Diesel, Waste Oil / Motor / Hydraulic / LubriCAting Other Groundwater (Uses Other Than Drinking Water), Soil High Performance Auto Service/Repair Shop With Leaky Ust And Hoists. Sources Have Been Removed. Monitoring Natural Attenuation. Site Assessment/Site Investigation Close And Remove Tank, Other Means ExCAvate Hoists & Ust W/Some Soil Hamilton Army Airfield - Haaf Facilty Wide 1 Burma Road Novato CA Mobil UnoCAl 975 Diablo Ave Novato CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Townsend & Townsend Property 640 Sir Francis Drake Blvd San Anselmo CA Gasoline Soil Tank Closure Howard Rice Property 836 Francisco Blvd W San Rafael CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Chevron Station 9-4737 90 Madera Blvd. Corte Madera CA Diesel, Gasoline Other Groundwater (Uses Other Than Drinking Water) The Site Is An Active Chevron Owned Service Station Located In The Northeast Corner Of The Town Center Corte Madera (Shopping Center) At 90 Madera Boulevard In Corte Madera, CAlifornia. Land Use In The Area Is Mixed Commercial And Residential. The Town Center Corte Madera Parking Lot Borders The Site To The South And West. To The East And North Are Highway 101 And Madera Boulevard, Respectively. The Site Will Continue To Be Used As A Gasoline Service Station For The Foreseeable Future. Between 1991 And 2005, Five Groundwater Monitoring Wells (Mws) Were Installed, Four On-Site (I.E., Mw 1 Through Mw 4) And One (I.E., Acmw 1) Off-Site To Assess The Extent Of HydroCArbons In Soil And Groundwater. Groundwater Monitoring Was Performed Between 1991 And 2006. On The Basis Of Low Concentrations Of Petroleum HydroCArbons In Groundwater, Closure Was Granted In 2006, Monitoring Was Ceased, And The Five Mws Were Destroyed Under Permit. 2007 Station Upgrade And Remedial Soil ExCAvation In June Through August 2007, Four Hydraulic Hoists, One Steel Hydraulic Oil Tank, Three Gasoline Underground Storage Tanks (USTs), One Diesel Ust, Six Dispensers, Associated Product Lines, And One Abandoned Steel Ust Were Removed. Conestoga-Rovers & Associates (Cra) Subsequently Collected Compliance Soil Samples And Grab Groundwater Samples. Total Petroleum HydroCArbon As Hydraulic Oil (Tph-Ho) Was Detected In Soil Beneath The Hydraulic Hoists And Tank. Due To Elevated HydroCArbon Concentrations Detected In Soil Samples Collected Beneath The Product Lines, Dispenser Islands, And Abandoned Steel Ust, A Total Of 2,790 Tons (Approximately 2,060 Cubic Yards) Of HydroCArbon-Bearing Soil Were ExCAvated And Removed From The Site. From July 17 To August 14, 2007, Approximately 12,120 -Gallons Of Groundwater Were Pumped From The Site ExCAvations Into An On-Site Holding Tank, Through A Particulate Filter, Two Aqueous Phase CArbon Vessels In Series, And Finally Through An On-Site Totalizer, Prior To Discharge To The On-Site Sanitary LoCAtion. After All Soil And Groundwater Removal Activities, The Final Soil Confirmation Samples Contained A Maximum Of 1,100 Milligrams Per Kilogram (Mg/Kg) Of Total Petroleum HydroCArbon As Gasoline (Tph-G), 890 Mg/Kg Of Total Petroleum HydroCArbon As Diesel (Tph-D), 2.3 Mg/Kg Of Benzene, And 1.7 Mg/Kg Of Tert-Butyl Methyl Ether (Mtbe). Grab Groundwater Samples From The ExCAvation Pits Contained A Maximum Of 28,000 Micrograms Per Liter (µg/L) Of Tph-G, 160,000 µg/L Of Tph-D, 1,700 µg/L Of Benzene, And 3,400 µg/L Of Mtbe. 2008 Environmental CAse Re-Opened Based On AnalytiCAl Data Reported In Cra?S November 19, 2007 Underground Storage Tank Removal And Soil ExCAvation Report, The Water Board Re-Opened The Environmental CAse And Requested That Further Soil And Groundwater Investigation Be Conducted At The Site. 2008-2009 Subsurface Investigation And 2010 Monitoring Well Installation In October 2008, Cra Advanced Soil Borings Sb1 Through Sb7 To Evaluate HydroCArbons Remaining In Soil And Groundwater After The 2007 Remedial ExCAvation. In July Of 2010, Cra Installed On-Site Monitoring Wells Mw-5 Through Mw-7 At The Request Of The Regional Water Board. Residual Soil Concentrations Residual HydroCArbons Have Been Detected In Soil Between 3 And 19.5 Ft Bgs (Below Ground Surface) , With The Highest Concentrations Detected Between 3 And 9 Ft Bgs. The Primary ChemiCAls Of Concern (Cocs) In Soil Are Tph-G, Benzene, And Mtbe. The Horizontal And VertiCAl Extent Of Petroleum HydroCArbons In Soil Has Been Defined. The Highest Concentrations Of Cocs Detected In Soil Samples Were Reported At Ex46 At A Depth Of 9 Ft Bgs. LoCAtion Ex46 Is Northwest Of The Former USTs And South Of The Former Orphan Ust. The Highest Concentrations Of The Cocs Detected Are At 9 Feet Below Grade (1,100 Mg/Kg Of Tph-G, 890 Mg/Kg Of Tph-D, 2.3 Mg/Kg Of Benzene, And 1.7 Mg/Kg Of Mtbe). Much Lower Concentrations Of Cocs Were Detected At 0 To 5 Feet Below Grade. Residual Groundwater Concentrations Table B Shows The HistoriCAl Maximum And The Current Groundwater Concentrations (First Quarter, 2013) Of The Primary Cocs Detected In Monitoring Wells And Compares Them To The AppliCAble Esls. Table B Maximum And Current HydroCArbon Concentrations In Groundwater Analyte Max. HistoriCAl Concentration (Ug/L) Max. Current Concentration (Ug/L) Drinking Water Esl(Ug/L) Tph-G 320 (Mw 6) 74 (Mw 6) 100 Benzene 5 (Mw 6) <0.5 100 Mtbe 380 (Mw 6) 26 (Mw 6) 1 Tba 1,200 (Mw 5) 550 (Mw 5) 12 As IndiCAted In The Table Above, The Maximum Concentrations Have Decreased Since 2010, Which Is Expected Based On The Fact That The Former Fueling Facilities Were Removed In 2007. The Table Also Shows That The Esls Are Exceeded By The Current Mtbe And Tba Concentrations. However, The Groundwater Plume Is Naturally Attenuating, Is Primarily On-Site, Is Defined, Stable And Degrading, And Therefore Has Likely Reached Its Maximum Extent. No Lnapl (Light Non-Aqueous Phase Liquid) Has Ever Been Detected On-Site. Low-Threat Closure Criteria The Site Meets The Criteria For Low Threat Closure In The State?S Low Threat Closure Policy Based On The Following: ? The Site Is Located Within The Service Area Of Marin Municipal Water District. ? The Site?S Unauthorized Release Has Been Characterized As A Release Of Petroleum Based Products. ? The ?Primary? Release Date Is Estimated Around 2007 And Site Data Support Cra?S Conclusion That The Site?S Primary Release Has Been Stopped. ? No Lnapl Has Been Observed In Any Of The Wells Since Groundwater Monitoring Began In 2007. ? A Conceptual Site Model Was Completed By Cra In 2009 As A Part Of A Closure Request. ? Remedial ExCAvation Of 2,170 Cubic Yards Of Soil Was Performed In The Area Of The USTs And Dispenser Islands In 1990, 1991 And 2007. Remaining HydroCArbon Concentrations In Soil Are Expected To Continue To Degrade. Therefore, Further Remediation Of Secondary Source Mass Is Not Deemed Necessary. ? Soil And Groundwater Samples Have Been Tested For Mtbe. Remaining Residual Concentrations Of Mtbe Continue To Degrade As Evidenced By The Presence Of Tba. The Results Of The AnalytiCAl Testing Have Been Made Available And Reported To The Regional Water, As Per CAlifornia Health And Safety Code 25296.15. ? Conditions Satisfying The Definition Of A Nuisance As Defined In Water Code Section 13050 Do Not Exist At The Site. ? Groundwater - The Site Satisfies Class 1 Of The Groundwater Specific Criteria. The Petroleum HydroCArbon Plume Has A Predicted Maximum Length Of Less Than Approximately 100 Feet, No Lnapl Has Been Reported At The Site, And There Are No Water Supply Wells Within 250 Feet Of The Site. ? Vapor - The Low Threat Policy States That Satisfaction Of The Media Specific Criteria For Petroleum Vapor Intrusion To Indoor Air Is Not Required At Active Commercial Petroleum Fueling Facilities, Except In CAses Where Release Characteristics CAn Be Reasonably Believed To Pose An Unacceptable Health Risk. ? Direct Contact And Outdoor Air Exposure - No Benzene, Ethylbenzene, And Pah Soil Concentrations Exceed The Direct Contact And Outdoor Air Exposure Criteria For Residential And Commercial/Industrial Uses. Ust System ModifiCAtion Close And Replace Tank Soulajule Reservoir Na Soulajule Reservoir West Marin CA Other Inorganic / Salt Surface Water Marin Municipal Water District Is The Holder Of Water Right License 12807 And Water Right Permit 16892 With The State Water Board, Division Of Water Rights For The Operation Of Soulajule Reservoir For The Purpose Of Diverting Water From Arroyo Sausal Tributary To Walker Creek. Walker Creek Supports Populations Of Coho Salmon And Steelhead Trout, As Well As Other Aquatic Species. The Right Holder's Water Rights For Soulajule Reservoir Are Conditioned Upon Continued Compliance With A Cooperative Agreement With The CAlifornia Department Of Fish And Wildlife, That The Right Holder Releases Water Into Arroyo Sausal For Enhancement Of Salmon And Steelhead In Walker Creek. This Requires The Right Holder To Release Cooler Water From The Lower Depths Of Soulajule Reservoir To Maintain A Cold Water Habitat For The Creeks And Tributaries. The Water Released Will Have Water Quality Measured For Temperature, Dissolved Oxygen And Dissolved Sulfide. A Howell-Bunger Valve Was Installed, And Is Used To Aerate Release Water When Dissolved Oxygen Levels Are Low. North Marin Water District 999 Rush Creek Rd Novato CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Former Grand Auto 7427 Redwood Blvd Novato CA Redwood Landfill Highway 101 North Novato CA Redwood Oil Company 1011 Lincoln Ave San Rafael CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Novato Storage Park Rancho Del Pantano Unknown Airport Rd & Binford Rd Novato CA Marine Corps Reserve Center 153 Madison Ave San Rafael CA Diesel Soil Tank Closure Pacific Bell 414 Turney St Sausalito CA Diesel Other Groundwater (Uses Other Than Drinking Water) Tank Closure Marin Municipal Water District 220 Tamal Vista Blvd Corte Madera CA Waste Oil / Motor / Hydraulic / LubriCAting Other Groundwater (Uses Other Than Drinking Water) Tank Closure Exxon 200 Nellen Ave Corte Madera CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure UnoCAl 1701 Grant Ave Novato CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Martinez Electric 3155 Kerner Blvd San Rafael CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Former Chevron #9-4553 1722 4th St San Rafael CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Peacock Gap Golf & Country Clb 333 BisCAyne Dr San Rafael CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Clipper Yacht Marina 310 Harbor Dr Sausalito CA Diesel Other Groundwater (Uses Other Than Drinking Water) Tank Closure Former County Garage 519 4th St San Rafael CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Tank Removed Watkin & Bortolussi Inc 77 Larkspur St San Rafael CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Peter's Alliance 831 Francisco Blvd E San Rafael CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Nike Battery 91, Angel Island - Nike Battery 91, Angel Island (J09CA094300) 318 P.O. Box Tiburon CA Zappetini & Sons 1112 2nd St. San Rafael CA Gasoline, Lead Soil Deed Restriction And Soil Management Plan Prepared 1/2009 Tank Closure Close And Remove Tank Usace Sausalito Laboratory - A Parent (South Pacific Division Laboratory) 25 Liberty Ship Way Sausalito CA Polychlorinated Biphenyls (Pcbs) Other Groundwater (Uses Other Than Drinking Water), Soil From Dtsc: The Spd Laboratory Has A Complex Land Use History. The Area Was First Developed In The 1870's When The Former Northwestern Pacific Railroad Rail Yard Was Constructed. The Railyard Was Developed Into The Marinship Shipyard During World War Ii (1942). The Building (Site) Was Constructed And Operated As A Machine Shop. The U.S. Army Corps Of Engineers Acquired One Building From The Shipyard In 1948, Converted It Into A GeotechniCAl Testing Laboratory In 1950. An AnalytiCAl Laboratory CApability Was Added In The Early 1990s. The Spd Laboratory Closed In 1997. Investigations Have Identified Polychlorinated Biphenyls (Pcbs) Contamination In The Soil And Petroleum HydroCArbon Contamination In The Soil And Groundwater. Other Potential Contaminants Identified Were Solvents And Metals. Solvents Were Detected SporatiCAlly At Low Concentrations In The Groundwater. Elevated Concentrations Of Arsenic In Groundwater And Of Metals In The Soil Were Detected Sitewide And Appear To Be Anthropogenic Background. A Soil Removal Action Was Completed In 2006 To Remove Pcb Contamination Detected Above Levels Considered Safe For Commercial/Industrial Use. Low Level Residual Pcb Contamination Remains In The Subsurface North Of The Building. The Property Was Transferred To The Veterans Administration In 2006. As Of May 2007, The U.S. Army Has Transferred The Property To The General Services Administration For Eventual Transfer To The Veterans Administration Who Will Renovate The Building For Consolidated MediCAl Testing Operations. The Land Use Will Remain Commercial/Industrial. * Other Means Report For Pcb Removal Action Submitted By The Usace To Water Board. Pacific Bell 7 Professional Pkwy San Rafael CA Kerosene Other Groundwater (Uses Other Than Drinking Water) Tank Closure Kelleher Corp 10 Grandview Dr Novato CA Gasoline Soil Tank Closure Former Chevron 700/750 Sir Francis Drake Blvd San Anselmo CA Gasoline Other Groundwater (Uses Other Than Drinking Water) The Subject Property (Site) Is Located Within A Commercial Zone Surrounded By Residential Homes And Small Commercial Parcels, Situate At The Base Of Red Hill. Currently, The Site Is Developed With An Operating Gas Station And Convenience Store. Three (3) Underground Storage Tanks (USTs) Are Plumbed To Pump Islands To The Central / Western Portion Of The Site. The USTs Include Two (2) 10,000-Gal CApacity Tanks And One (1) 12,000-Gal Tank. In Nov 1994, An Unauthorized Release (Leak) Was Reported, With Subsequent Work Of Ust Removal In 1995, Along With One (1) 500-Gal Waste Oil Tank (Wot). The Three (3) USTs Were Replaced, However The Wot Was Not Replaced. Groundwater Monitoring Began In March 1994. In 2014, On Site Soil Borings Were Advanced In Order To Better Delineate Any Contamination In Soil And Determine Extent Of The HydroCArbon Release. Tphd (Total HydroCArbons As Diesel), Tphg (Total HydroCArbons As Gasoline), And Mtbe (Methyl Tert Butyl Ethylene), Were All Found In Groundwater Samples Collected On Site. A Conceptual Site Model (Csm) Has Been Suggested To Better Define The Extent And Nature Of The Contaminant Plume For On And Off-Site Delineation. Tank Closure Sun Iron Works 1261 E. Francicso Blvd San Rafael CA Gasoline Other Groundwater (Uses Other Than Drinking Water), Soil Tank Closure Tosco - Facility #3505 700 Tamalpais Dr Corte Madera CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Larkspur Cleaners 590 Magnolia Avenue Larkspur CA Tetrachloroethylene (PCE) Other Groundwater (Uses Other Than Drinking Water), Soil, Soil Vapor, Under Investigation D & S Garage 718 4th St San Rafael CA Waste Oil / Motor / Hydraulic / LubriCAting Soil Tank Closure Ferrer Plumbing 58 Lovell Ave San Rafael CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure College Of Marin - Kentfield, Former Gas Station College Ave And Sir Francis Drake Blvd Kentfield CA Benzene, Ethylbenzene, Gasoline, Toluene, Xylene During Redevelopment Investigation Novato Sanitary District Unknown Hwy 37 Novato CA Diesel Other Groundwater (Uses Other Than Drinking Water) Tank Closure Cheda Chevrolet 11225 State Rt 1 Point Reyes Station CA Gasoline Aquifer Used For Drinking Water Supply Tank Tightness Test 68 Gary Place 68 Gary Pl San Rafael CA Diesel Soil This Site Had An Above Ground Tank, But No Underground Tank. Tank Closure Stains On Soil From Ast Tank Removed, Soil & Groundwater Removed Martin's Triangle 234 Shoreline Hwy Mill Valley CA Total Petroleum HydroCArbons (Tph), * Fuel Oxygenates Soil Exxon 1551 Novato Blvd S Novato CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure DominiCAn College 190 Palm Ave San Rafael CA Heating Oil / Fuel Oil Soil Tank Closure Fort Cronkhite - Fort Cronkhite-Marine Mammal Center 1065 Fort Cronkhite Sausalito CA Gasoline Under Investigation Fort Cronkhite Will Be Its Own Stand Alone Site In Geotracker In The Future. It Is Currently Inactive. A Report Prepared By Earth Technology Corporation (Etc) Identified Four Inactive USTs, And One Removed Former Day Tank Area. Field Inspections Confirmed The Presence Of Three USTs And Piping. The Contents Of One Tank Were Analyzed, And Determined The Tank Had Been Used To Store Both Gas And Diesel. Contents Of The Other Tanks Could Not Be Sampled. Sisters Of St Dominic 60 Locust St San Rafael CA Heating Oil / Fuel Oil Soil Tank Closure Zimmerman Dairy 22788 Clark Rd. Marshall CA Shell 1833 4th St San Rafael CA Waste Oil / Motor / Hydraulic / LubriCAting Other Groundwater (Uses Other Than Drinking Water) Tank Closure Marin Hyundai 5880 Paradise Dr Corte Madera CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Tosco - Facility #4886 250 Tiburon Blvd Tiburon CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Novato Fire Station #2 999 Novato Blvd S Novato CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Schoonmaker Building 10 Liberty Ship Wy Sausalito CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Corte Madera Fire Department 342 Tamalpais Dr Corte Madera CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure UnoCAl 455 Miller Ave Mill Valley CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Heath Ceramics 400 Gate 5 Rd Sausalito CA Lead Soil No Further Action Issued 9/23/2008 Change Operating Procedures CArrico Property 619 CAnal St San Rafael CA Waste Oil / Motor / Hydraulic / LubriCAting Other Groundwater (Uses Other Than Drinking Water) Tank Closure Acme Alarm Company 128 Mitchell Blvd San Rafael CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Hamilton Army Airfield - Hamilton Aaf Outparcel A4 -Ust Outparcel A4 N/A Hangar Avenue Novato CA Maoli Consolidated Enterprises 1000 Bridgeway Blvd Sausalito CA Stoddard Solvent / Mineral Spriits / Distillates Other Groundwater (Uses Other Than Drinking Water) Tank Closure Toby's Trucking Inc Unknown B St Point Reyes Station CA Diesel Other Groundwater (Uses Other Than Drinking Water) Tank Closure Mckesson Water Products Company 648 Lindaro St San Rafael CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Tiburon Navy Net Depot Bdg 50 3150 Paradise Dr Tiburon CA Heating Oil / Fuel Oil Other Groundwater (Uses Other Than Drinking Water) Tank Closure Ornish Property 900 Bridgeway Blvd. Sausalito CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Subsurface Monitoring Super 7 2070 Old Redwood Hwy Larkspur CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Rossi's General Store & Deli 5 Harbor Drive Novato CA Gasoline Under Investigation Tank Closure 4 USTs Removed In 1990 And 1992. Groundwater Samples From Ust Pits Contained Up To 11,000 Ppb Of Tph-G And 84 Ppb Of Benzene. Close And Remove Tank H & J Tire 7426 Redwood Blvd Novato CA Waste Oil / Motor / Hydraulic / LubriCAting Soil Tank Closure Conocophillips 921 Del Presidio San Rafael CA Diesel, Gasoline Other Groundwater (Uses Other Than Drinking Water) Site Assessment/Site Investigation Close And Remove Tank, Close And Replace Tank, Repair Product Piping Chevron 301 Sir Francis Drake Blvd Greenbrae CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Nat Park Serv Stewart Ranch 8497 State Rt 1 Olema CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Former UnoCAl 250 East Blithedale Avenue Mill Valley CA Gasoline Other Groundwater (Uses Other Than Drinking Water) The Site Contains Two Buildings That Are Currently Used For Commercial Purposes. The Site Was Previously Occupied By An Automobile Dealership, Repair Shop And Gasoline Service Station From Approximately 1940 Until 1965. Between 13 And 20 December 2006, The USTs And Associated Piping Were Uncovered, Emptied, Cleaned And Removed From The Site. The USTs Removed Included Three Gasoline Ust, And One 120-Gallon Waste Oil Tank (Wot). Each Of The USTs Appeared To Be In Good Condition With No Visible Pitting Or Holes. No Groundwater Was Present In The Bottom Of The ExCAvation. Petroleum Odors And Soil Staining Was Observed At The Eastern End Of The Gasoline USTs. No Odors Or Stains Were Observed At The LoCAtion Of The Wot. Following The Ust Removal And Initial Over-ExCAvation Of Impacted Soil, Confirmation Soil Samples Were Collected From The Ust ExCAvations. The AnalytiCAl Results For Initial Soil Collected During The Ust Removal Reported Concentrations Of Total Petroleum HydroCArbons (Tph) As Gasoline (Tphg) Up To 2,500 Milligrams Per Kilogram (Mg/Kg), Tph As Diesel (Tphd) Up To 460 Mg/Kg, And Benzene Up To 3.6 Mg/Kg. In Early January 2007, Errg Over-ExCAvated The Areas SignifiCAntly Impacted By Petroleum HydroCArbons. A Second Set Of Confirmation Samples Were Collected From The ExCAvation Bottom (Between 8.5 And 11.5 Feet Bgs) After The Impacted Soil Was ExCAvated. The Results Of These Samples IndiCAted That A Maximum Concentration Of 68 Mg/Kg (Tphg) Was Detected Remaining In Soil At The Former Gasoline Ust LoCAtions. A Grab Groundwater Sample Collected From The Ust ExCAvation Contained Tphg At 1,600 Micrograms Per Liter (Ug/L), Tphd At 1,200 Ug/L, And Benzene At 22 Ug/L, Which Are Below Esls For Vapor Intrusion Into Residential Buildings But Above Drinking Water Standards (Mcls). In March 2008, Treadwell & Rollo (Tr) Conducted A Sensitive Receptor Survey Including A Site Area Reconnaissance And Reviewing Dwr Well Logs Of Potential Receptors To Impacted Groundwater. The Nearest Surface Water Body Is Arroyo Corte Madera Del Presidio, Located About 200 Feet South Of The Former USTs. Five Water Wells Were Also Identified Within 2,000 Feet Of The Site. The Nearest Water Well Is Located 690 Feet Southwest Of The Site And Is Screened From 55 To 75 Feet Bgs. The Next Closest Water Well Is Located 1,500 Feet South Of The Site And Is Screened From 10 To 30 Feet Bgs. These Five Water Wells Are Not Threatened By The Residual Soil And Groundwater Pollution At The Site Due To Their Distances From The Site, Their Screened Intervals, And/Or The Presence Of Arroyo Corte Madera Del Presidio Between The Site And The Water Wells. In June 2008, Tr Advanced Six Soil Borings At And Down Gradient Of The Former Gasoline USTs To Collect Grab Groundwater Samples For ChemiCAl Analysis. One Soil Boring (Tr-03) Was Advanced Into The Ust ExCAvation Backfill Material To Evaluate The Former Source Area Groundwater Chemistry, And Five Borings Were Advanced In The Anticipated Downgradient Direction From The Former USTs. The Grab Groundwater Results IndiCAted That Groundwater In The Vicinity Of The Gasoline USTs Remains Above Mcls, But That Natural Attenuation Is Occurring And That The Contaminants Are Not EsCAping Beyond The Site. Grab Groundwater Samples From All Of The Borings Except Tr-03 Contained Very Low Or Non-Detectable Concentrations Of Tphg. Btex, And Mtbe. Tr-03, The Sample Collected From The Former Ust LoCAtions Had Concentrations Of Tphg At 11,000 Ug/L And Benzene At 100 Ug/L. The Respective Mcls For These Compounds Are Tphg At 100 Ug/L And Benzene At 1 Ug/L. Mtbe Was Not Detected In Tr-03 Or Any Other Sample. The Results Of This Groundwater Investigation Suggest That The Extent Of Groundwater Impact Resulting From The Former Ust Release Is Limited Approximately 100 Feet South Of The Former USTs Within The Site Boundaries. The Maximum Concentrations Detected In Tr-03 Are Well Below Esls For A Residential Vapor Intrusion Risk And The Extent Of Contaminants Above Drinking Water Standards (Mcls) Are Likely Limited To The Site. Therefore, None Of The Sensitive Receptors Within 2,000 Feet Of The Site Is Expected To Have Been Exposed To Groundwater Impacts From The Site. Lastly, Since The Source Of Contamination Has Been Removed/Remediated (The Former USTs And Surrounding Impacted Soil) And The Remaining Impacts In Groundwater Are Likely Naturally Degrading, It Is Unlikely That These Receptors Would Be Exposed To Site Contamination In The Future. Based On The Following, CAse Closure For This Site Is Considered To Be Appropriate: (1) The Site Has Been Adequately Investigated; (2) The Primary Source (The USTs That Formerly Occupied This Site) And The Secondary Source (The Surrounding Impacted Soil) Have Been Removed In December 2006 And January 2007; (3) The Remaining Soil And Groundwater Impacts Have Been Defined And Is Present Only In The Immediate Vicinity Of The Former USTs; (4) The Residual Concentrations IndiCAtes That Vapor Intrusion Into Existing On-Site Buildings Are Not Expected To Pose A SignifiCAnt Indoor Air Health Risk; (5) As Discussed Earlier, The Residual Pollution Do Not Pose A Threat To Nearby Sensitive Receptors Such As Surface Water Bodies And Water Wells; And (6) The Residual Concentrations In The Soil And Groundwater Do Not Represent A Current Or Future Public Health, EcologiCAl, And Water Resources Threat. Tank Closure Close And Remove Tank Sartori Dairy 3301 Tomales Petaluma Hwy Tomales CA Nike Battery 93, Sf (J09CA094400) - Aoi 10 S-411 ElectriCAl Power Plant Ast 290 Smith Ranch Rd San Rafael CA Chevron 103 Blithedale Ave E Mill Valley CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Commercial Building 1115 3rd St San Rafael CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Lamperti Inc 1241 Andersen Dr San Rafael CA Gasoline Soil Tank Closure San Anselmo Cottages 1608 - 1616 Sir Francis Drake Blvd San Anselmo CA Gasoline, Waste Oil / Motor / Hydraulic / LubriCAting Under Investigation Tank Closure Shell 2085 Novato Blvd S Novato CA Gasoline Other Groundwater (Uses Other Than Drinking Water) The Subject Property (Site) Is An Operating Shell-Branded Gasoline Service Station Located On Novato Blvd Near Sierra Vista In Novato, CAlifornia. The Current Station Uses Three (3) Existing Underground Storage Tanks (USTs) And Has A Former Waste-Oil Tank (Wot) On The Property. Concentrations Of Total Petroleum HydroCArbons As Gasoline (Tphg) Were Reported In Groundwater Samples Of Up To 1,800 Ug/L, With Very Low Concentrations Of Other Compounds And Associated Fuel Oxygenates. Plume Appears To Be Well-Delineated And Contained. Tank Closure Mobil 630 Blithedale Ave E Mill Valley CA Waste Oil / Motor / Hydraulic / LubriCAting Other Groundwater (Uses Other Than Drinking Water) Tank Closure Pacific Bell 96 Louise St San Rafael CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure CAltrans Manzanita Facility 40 Shoreline Hwy Mill Valley CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Woltering Property 725 Lincoln Avenue San Rafael CA Waste Oil / Motor / Hydraulic / LubriCAting Soil * Other Means Discovered During Hoist Removal. San Quentin State Penitentiary Unknown I 580 San Quentin CA Stoddard Solvent / Mineral Spriits / Distillates Other Groundwater (Uses Other Than Drinking Water) Tank Closure Civic Center Service 77 San Pablo Ave. San Rafael CA Gasoline, Mtbe / Tba / Other Fuel Oxygenates Other Groundwater (Uses Other Than Drinking Water), Soil Ust System ModifiCAtion Piping Upgrade Repair Product Piping Former Mill Valley Motors 433 Miller Ave Mill Valley CA Heating Oil / Fuel Oil Other Groundwater (Uses Other Than Drinking Water) Tank Closure Exxon 156 Shoreline Hwy Mill Valley CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure John Irish Jeep Dealership 898 Lincoln Ave San Rafael CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Monterey Import Company 158 Paul Dr San Rafael CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Shell Station 401 Enfrente Road Novato CA Gasoline Other Groundwater (Uses Other Than Drinking Water), Surface Water The Subject Site Is A Shell Branded Service Station Located At 401 Enfrente Road In Novato, CAlifornia. State Highway 101 Is Located Across Enfrente Road About 50 Feet East Of The Subject Property. The Surrounding Property Uses Are Primarily Commercial. San Rafael, Creek Is Located Immediately Adjacent To The Site Along The Southern Boundary. Based On Three Onsite Monitoring Wells (Mws), Installed In November Of 2002, A HydroCArbon Release Was Reported, With The Source Area Appearing To Be In The Vicinity Of The USTs. During The Initial Groundwater Sampling Of These Wells On 1/14/03, Benzene Was Detected From One Well At 0.57 Micrograms Per Liter (Ƒ?G/L), Methyl Tertiary Butyl Ether (Mtbe) Was Detected At A Maximum Concentration Of 14,000 Ƒ?G/L (Mw 3), And Tba Was Detected At A Maximum Concentration Of 490 Ƒ?G/L (Mw-3). An Unauthorized Release Form For The Site Was Filed On 1/28/03. In April Of 2004 Installation Of Three Additional Onsite Mws. Soil Samples Were Collected From Each Well Boring, With Total Petroleum HydroCArbons As Gasoline (Tph-G) Being Detected At A Maximum Concentration Of 37 Mg/Kg. Various Forms Of Remediation At The Site Occurred Between September Of 2003 And February Of 2005, As Follows. Vacuum Truck Groundwater Extraction From Site Wells Was Performed In 2003 And In 2004. Approximately 2,699 Gallons Of Groundwater Was Extracted Resulting In The Removal Of Approximately 0.079 Pounds Of Tph-G, 0.001 Pounds Of Benzene, And 0.265 Pounds Of Mtbe. Soil Removal And Groundwater Extraction Was Also Performed At The Site During Dispenser And Ust Upgrade Activities In February Of 2005. During These Upgrade Activities, Approximately 57.6 Tons Of Impacted Soil Was Removed From The Site, And Approximately 6,439 Gallons Of Groundwater Was Extracted From The Ust Pit. Sensitive Receptor Surveys Were Performed In The Vicinity Of The Site In 2003 And 2004, Which Included An Effort To Identify Any Water Wells Within A One Half Mile Radius Of The Site. Discussions With The Two Marin County Water District¡?S That Serve The Area Confirmed That There Were No Public Water Supply Wells Within 2,000 Feet Of The Site, And That The Area Is Serviced By Domestic Water Supply System. The Sensitive Receptor Survey Did Identify Two Irrigation Well, However They Were Located Approximately 830 Feet East Northeast Of The Site And 2,640 Feet North Of The Site. The Nearest Surface Water Body Is The San Jose Creek, Which Is A Intermittently Dry Creek Located Adjacent To The Site Along The Southern Boundary, And Enters A Culvert At The Adjacent Enfrente Road. Groundwater Monitoring Has Been Occurring At The Site Since January 2003. Maximum HistoriCAl Detectable Groundwater Concentrations Of Select Petroleum HydroCArbons Were Reported At 690 Ƒ?G/L Tphg In Well Mw 6 (September, 2006), 1.4 Ƒ?G/L Benzene In Well Mw 1 (March, 2005), 14,000 Ƒ?G/L Mtbe In Well Mw 3 (January, 2003), And 810 Ƒ?G/L Tba In Well Mw 3 (March, 2005). During The Most Recent First Quarter 2010 Groundwater Monitoring Event, Maximum Detectable Concentrations Of These Same Select Petroleum HydroCArbons Were Reported At 97 Ƒ?G/L Tphg In Mw 3 And 110 Ƒ?G/L Mtbe In Well Mw 3. Benzene Has Been Reported At Below Detection Limits In All Site Wells Since March Of 2005. Tba Has Been Reported At Below Detection Limits In All Site Wells Since September Of 2007. Based On The Following, CAse Closure For This Site As A Low Risk Fuel Site Is Considered To Be Warranted: (1) The HistoriCAl Release At This Site Has Been Stopped. (2) The Site Has Been Adequately Investigated, And The Extent Of Soil And Groundwater Impact At The Site Has Been Adequately Delineated To The Extent Necessary To Evaluate Any Risks Associated With The Impacts. (3) Concentrations Of Petroleum HydroCArbon Constituents In Groundwater Have Decline Through Active Remediation Along With Natural Attenuation Processes, And The Groundwater Plume Is Shrinking. (4) Only Residual Tphg And Mtbe Remain In The Groundwater At The Site And All Other Constituents Are Below Detection Limits. The Residual Tphg And Mtbe Detected In The Groundwater During The Second Quarter 2009 Was Evaluated, And With Continued Natural Attenuation, It Was Determined That These Constituents Will Reach The Lowest Sfbrwqcb Environmental Screening Levels (Esls) In Less Than 8 Years. (5) There Are No Drinking Water Wells In The Vicinity, And There Is Little Likelihood That The Shallow Groundwater At The Site Will Be Used As A Drinking Water Supply In The Near Future. The Nearest Water Wells To The Site Are Two Irrigation Wells Located 830 Feet And 2,640 Feet From The Site. (6) Residual Concentrations Of HydroCArbon Constituents In Soil And Groundwater Have Been Evaluated With Esls Associated With Surface Water Bodies And Have Been Determined To Pose No Threat To The Nearest Receptor Of The Adjacent San Rafael, Creek. (7) The Site Is Currently In Commercial Land Use As An Operating Service Station And Is Anticipated To Remain In Commercial Land Use For The Foreseeable Future; And The Residual Concentrations Of HydroCArbon Constituents In Soil And Groundwater Have Been Determined To Pose No Threat To Current Onsite Commercial Use, Or Anticipated Future Commercial Uses At The Site. (8) The Residual Petroleum Impacts At This Site Have Been Evaluated And Determined To Pose Very Little, Or No Risk, To Human Health Or The Environment Currently, Or In The Foreseeable Future. Subsurface Monitoring Marin County Civic Center 3501 Civic Center Dr San Rafael CA Diesel Aquifer Used For Drinking Water Supply Other Means Stop Leak, ExCAvate UnoCAl 801 Tamalpais Dr Corte Madera CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Mobil 1101 3rd St San Rafael CA Benzene, Tetrachloroethylene (PCE), Gasoline Other Groundwater (Uses Other Than Drinking Water) Well Resampled In 2008, Low Detections, Close CAse In 2009. Tank Closure Close And Remove Tank Rush Creek Estates Atherton Ave @ Binford Rd Novato CA Former Probert's Service Station 240 Magnolia Avenue Larkspur CA Gasoline Aquifer Used For Drinking Water Supply, Other Groundwater (Uses Other Than Drinking Water) A Gasoline Service Station Occupied A Portion Of The Site Until 1970, When The Property Converted Into Retail Shops And The Lark Creek Inn Restaurant. On 11/7/07, Three USTs Were Removed From The Site. No Product Was Observed In The USTs Or In The Ancillary Piping During Removal Activities. 32 Tons Of Impacted Soil Were Removed During The Ust Removal Activities. Final Soil Confirmation Samples Contained A Maximum Of 2,100 Mg/Kg Of Tphg, 1.8 Mg/Kg Of Benzene, 2.7 Mg/Kg Of Toluene, 9.9 Mg/Kg Of Ethylbenzene, And 22 Mg/Kg Of Xylenes. Between October And December 2008, A Door-To-Door Sensitive Receptor Survey Was Conducted. Dwr Well Drillers Reports Identified Three Wells Located Within 250 Feet Of The Former Ust LoCAtions. One Of These Wells Is Dw-240, Located On- Site. One Well Is Located Across Larkspur Creek. The Third Well Is Located In An Empty Lot. Pid Readings In All Accessible Utilities And Vaults Within 250 Feet Of The Site Were All Nd. The Nearest Surface Water Body Is Larkspur Creek Which Runs Along The East Side Of The Site. Six Soil Borings Were Installed In August 2009. Soil Samples From The Borings Detected A Maximum Of 29 Mg/Kg Of Tphg, 0.015 Mg/Kg Of Xylenes, And Non-Detectable (Nd) Concentrations Of Bte & Mtbe. Tphg Was Detected At 95 Ug/L In One Grab-Groundwater Sample Collected From The Soil Borings; No Other Analytes Were Detected In Any Of The Grab Groundwater Samples. No Analytes Were Also Detected In The Water Sample Taken From The On-Site Domestic Well, Dw-240. Based On The Following, CAse Closure For This Site Is Considered To Be Appropriate For Closure As A Low Risk Groundwater Site: (1) The Primary Source (Two 1000 Gallon And One 550-Gallon Gasoline USTs) Have Been Removed. The Secondary Source, About 32 Tons Of Impacted Soils, Were Over-ExCAvated And Transported Offsite; Source Material Has Been Removed To The Extent PractiCAble And The Residual Impacted Soil Does Not Appear To Be A Source For SignifiCAnt Groundwater Contamination. (2) The Site Has Been Adequately Characterized. The Degree Of Impact To Groundwater Is Minor And The Extent Of The Impact To Groundwater Is Limited. Sensitive Receptors And Migration Pathways That Could Be Impacted By The Release Have Been Identified. (3) The On-Site Water Well, Which Is Down-Gradient From The Former USTs, Has Not Been Impacted. Given The Minor Fhc Concentrations In Groundwater And The Limited Migration Potential, It Is Highly Unlikely That Fhcs From The Site Will Impact The Other Two Water Wells Within 250 Ft Of The Former USTs. Limited Residual Impacted Soils Are LoCAlized To The Former LoCAtion Of The Site USTs At Depths Between 8 And 10 Ft Bgs And Groundwater Have Been Minimally Impacted. (4) No Water Wells, Deeper Drinking Water Aquifers, Surface Water, Or Other Sensitive Receptors Have Been Impacted Or Are Likely To Be Impacted From The Release From The Former USTs. (5) There Is Not A SignifiCAnt Risk To Human Health. There Is A Small But Easily Manageable Risk To Human Health If ExCAvation/Construction Activities Are Conducted Near The LoCAtion Of The Former Ust ExCAvation. The Potential Risk Would Be Mitigated By Preparing A Soil And Groundwater Management Plan (Sgmp). The Sgmp Would Describe Procedures To Notify The Appropriate Regulatory Agencies, Protect Worker?S Health, And Manage Impacted Soil And/Or Groundwater If It Is Encountered. (6) The Limited Concentrations Of The Volatile Components Of Gasoline In Soil, The Lack Of SignifiCAnt Impact To Groundwater, The LoCAtion Of The Former USTs, And The Fine-Grained Soils IndiCAtes That A Potential Vapor Intrusion Problem Does Not Exist. (7) The Residual Concentrations In The Soil And Groundwater Apparently Do Not Represent A Current Or Future Public Health, EcologiCAl, And Water Resources Threat. Tank Closure Close And Remove Tank Peter's Beacon 108 Bellam Blvd San Rafael CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Golden Gate National Recreational Area - Ggnra Main Marin - Hill 88 Off Bunker Road On Coastal Trail Sausalito CA Under Investigation Savoy Rain Tunnel 620 2nd St San Rafael CA Waste Oil / Motor / Hydraulic / LubriCAting Other Groundwater (Uses Other Than Drinking Water) Tank Closure Stenson Property 13 San Clemente Dr Corte Madera CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Wagner Property 933 Francisco Blvd E San Rafael CA Stoddard Solvent / Mineral Spriits / Distillates Soil Tank Closure Chevron 9-4493 1515 Tiburon Hwy Tiburon CA Gasoline Other Groundwater (Uses Other Than Drinking Water) The Site Is Located In The City Of Belvedere, Marin County. The Site Is Currently A Commercial Property. There Are No Plans To Alter The Property From Commercial Uses. The Site Is Occupied By An Automotive Repair Shop. The Site Is Surrounded By Commercial And Residential Properties. The Gasoline USTs Were Removed By Chevron In 1979, And Replaced In 1982. Starting In May 1993, Several Phases Of Investigations Were Conducted At The Site Including Installation Of Monitoring Wells (Mws). On 9/18/93, 115 Cubic Yards Of Petroleum Impacted Soil Were Removed From The Site. Impacted Soil Remained In-Place Along The Southern End And Western Side Of The ExCAvation. Substantial Spikes In Mtbe Concentrations Occurred Several Times In Groundwater (Gw) Samples From The Mws. In May 2000, The Ust For Waste Oil Was Removed Along With Associated Piping. Following Removal Of The Waste Oil Ust, Over-ExCAvation Of The Area Occurred Which Extended To Include The Entire Area Formerly Occupied By The USTs That Were Removed In 1979. Over-ExCAvation Removed The Impacted Soil To Levels Below 30 Mg/Kg. A Total Of 725 Tons Of Soil Were Removed. 2,700 Gallons Of Impacted Gw Was Also Removed, And Disposed Of Off Site. The Ust's Were Taken Out-Of-Service On 12/22/98. In Early 2000, A Gw Treatment System Was Installed To Remove, Treat, And Dispose Of Impacted Gw. Between 2/23/00 And January 2001, 170,000 Gallons Of Gw Was Extracted, Treated, And Disposed Of. In July And August 2000, The Product Lines, Dispensers, And Other Parts Of The Fuel-Delivery System Were Upgraded. At This Time, It Was Discovered That The Over-Fill Containers For The Gasoline USTs At The Site Were Faulty, Spillage Into The Containers Would Drain Directly Into The Pea Gravel Backfill Surrounding The USTs. This Appears To Be The Likely Source Of Mtbe In Groundwater At The Site And Appears To Explain The Sporadic Nature Of The Mtbe Detections. The Faulty Over-Fill Devices Were Subsequently Replaced. In July 1999, A Sensitive Receptor Survey Was Conducted. The Nearest Sensitive Receptors Are Belvedere Lagoon And Belvedere Cove, Located About 700 Ft Southwest And South Of The Site. The Nearest Well Identified Was Located About One-Quarter Mile From The Site. Water From This Well Is Not Potable And Is Primarily Used For Washing Boats. The Surface Water Bodies And The Well Are Too Far Away To Be Impacted By The Impacted Gw From The Site. Since Repair Of The Overfill Containers In August 2000, The Site Gw Sample Results Showed Declining Levels Of Mtbe In The Mws, Suggesting That The Source Of The Mtbe Had Been Mitigated. In October 2005, The Three Gasoline USTs And All Associated Piping And Dispensers Were Removed From The Site. As Part Of The October 2005 Ust And Fuel System Removal Activities, 93,000 Gallons Of Gw Was Extracted, Treated, And Discharged To The Sanitary Sewer. From April 2 To May 29, 2007, 122,800 Gallons Of Gw Was Extracted From Areas Surrounding The Former USTs Tank Basin. Extracted Gw Was Treated And Discharged To The Sanitary Sewer. The Current Dissolved Phase Contaminant Plume Is Approximately 200 Feet Long And Is Primarily Comprised Of Low Concentrations Of Mtbe, Tba, Tph-G, And Tph-D. Plume Geometry And Concentration Data Have Displayed Stable Characteristics Over The Past Several Hydrologic Cycles With Overall Coc Concentration Experiencing Decline. Decreasing Contaminant Concentrations IndiCAte That Natural Attenuation Is Viable, Ongoing, And The Most Cost-Efficient Remedial Option For The Site. Current Gw Contaminant Concentrations Are Below The Water Board?S Esls For Gw That Is Not A Current Or Future Drinking Water Source (Gw Is Not Potential Source Of Drinking Water Due To High Salinity, > 10,000 Umhos/Cm). The Residual Concentrations In The Soil And Gw Apparently Do Not Represent A Current Or Future Public Health, EcologiCAl, And Water Resources Threat Base On The Current Land Use Scenario. Tank Closure Chevron 9-1413 1515 2nd St San Rafael CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Injecting For Isco, On 3 Mo. Cycles Tank Closure Nike Battery 93, Sf (J09CA094400) - Aoi 1 S-112 ElectriCAl Power Plant Ust 290 Smith Ranch Road San Rafael CA Soil Assessment From The Usace In May 1994, One 4,000-Gallon Diesel Underground Storage Tank (Ust; S-112) Was Located To The East Of The Former ElectriCAl Power Plant (Building 113), Which Is Now The 6th-Hole Fairway At Mcinnis Golf Course. No Stressed Vegetation Or Staining Was Visible During The Site Visit. Documents Pertaining To This Site Are Within The ?Closed CAse? Files At The Marin County Office Of Waste Management (Mcowm) Under The ?Mcinnis Golf Course? Filename. No Documentation Was Found Regarding Beneficial Use Of This Ust. This Aoi Is Fuds-Eligible BeCAuse No Documentation Was Found Regarding Beneficial Use Of The Ust And Sample Results Could Not Be Identified With This Area. Further Inspection May Be Warranted To Determine Possible VertiCAl And Horizontal Soil And/Or Water Environmental Impacts Of Extractable Total Petroleum HydroCArbons (Tph-E), Polychlorinated Biphenyls (Pcbs), Semivolatile Organic Compounds (Svocs), And Ph . Close And Remove Tank, Remove Contents Mcphail's Inc 917 C St San Rafael CA Diesel Other Groundwater (Uses Other Than Drinking Water) Tank Closure North Bay Produce 95 Louise St San Rafael CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Novato Lumber 7586 Redwood Blvd Novato CA Gasoline Soil Tank Closure Mcphail Pump Station 1580 Vendola Dr San Rafael CA Waste Oil / Motor / Hydraulic / LubriCAting Other Groundwater (Uses Other Than Drinking Water) Tank Closure Golden Hinde Inn & Marina 12938 Sir Francis Drake Blvd Inverness CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Chevron 101 Red Hill Ave San Anselmo CA Waste Oil / Motor / Hydraulic / LubriCAting Other Groundwater (Uses Other Than Drinking Water) Tank Closure Marin Mazda 595 Francisco Blvd E San Rafael CA Waste Oil / Motor / Hydraulic / LubriCAting Other Groundwater (Uses Other Than Drinking Water) Tank Closure Ggnra Mill Valley Air Station Unknown Unknown Mill Valley CA Diesel Soil This Site Is Located In Marin County At A Former Air Station Atop A Mountain. Other Means Other Means Fairfax Garbage Disposal 1583 Sir Francis Drake Blvd San Anselmo CA Gasoline Soil Tank Closure Mariner Distributing 110 Paul Drive San Rafael CA Diesel, Gasoline Other Groundwater (Uses Other Than Drinking Water) Ozone Sparging From 5/14/04 To 4/13/07 Visual Found During Tank Removal. Close And Replace Tank Tank Removal. Hagemeister Property 155 Santa Rosa Ave Sausalito CA Heating Oil / Fuel Oil Soil Tank Closure European Auto Services, Inc. 1163 Francisco Blvd. East San Rafael CA Waste Oil / Motor / Hydraulic / LubriCAting Other Groundwater (Uses Other Than Drinking Water) Subsurface Monitoring Close And Fill Tank In Place Marinship 2330 Marinship Way Sausalito CA Nickel Other Groundwater (Uses Other Than Drinking Water), Sediments, Soil, Surface Water Marinship Was An Active Shipyard From 1942 Through 1945 Under The Ownership Of Bechtel Ag. Other Industrial Activities Have Occurred At The Site: Painting, Metalworking, Maintenance And Manufacturing. Arques Shipyard Is Present Within The Boundaries Of The Former Marinship Site, It Has Been There Since 1946; A Commercial Fishing Company And The U.S. Army Corps Of Engineers Occupy The Former Outfitting Docks; A Park, A Beach And Residential Also Occupy The Former Site. A Cercla Site Inspection Was Conducted On January 12, 1995, And It Was Concluded That No Further Investigation Was Necessary Under Cercla: From This Investigation A Dump Site That Burned Waste Materials Was Found In The Southeast Corner And A Sludge Pit Was Found In The Northwest Portion Of The Site; No Samples Were Taken. East Fort Baker - Wharf Tank 659 Sommerville Rd. Sausalito CA Paradise Cleaners 5593 Paradise Dr Corte Madera CA * Rpr Bianco CAdillac Inc 201 CAsa Buena Dr Corte Madera CA Waste Oil / Motor / Hydraulic / LubriCAting Other Groundwater (Uses Other Than Drinking Water) The Site Is Used By An Operating Auto Dealership On A Frontage Road (CAsa Buena Drive) On The West Side Of Highway 101. The Site Is Mostly Paved Except Planting Strips And The Large Dealership Structure. Primarily Used For Grazing Prior To The 1940s, Auto Dealerships Have Occupied The Site Since. A 1,000 -Gal Underground Storage Tank (Ust) Or Waste-Oil Tank (Wot) Was Removed From The Site In May, 1990. In 1997, Elevated Levels Of Petroleum HydroCArbon Compounds Were Reportedly Detected In Soil. In Oct. 2000, One (1) Single-Wall, Tar-Wrapped Steel 2,000-Gal Ust For Gasoline Was Removed From The Site. In Feb 2010, Three (3) USTs Were Discovered, Crushed, Buried And Broken. By July, 2011 The Buried Tanks Were Removed. Soil And Groundwater Monitoring Continues (2015). Tank Closure Arco 374 Miller Ave Mill Valley CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure L & M Cleaners 2017 Novato Blvd. Novato CA Tetrachloroethylene (PCE), Trichloroethylene (TCE) Other Groundwater (Uses Other Than Drinking Water), Soil, Soil Vapor L&M Cleaners Is An Active Dry Cleaner Located Within The Square Shopping Center. In July 2006, Borings B-4 Through B-6 Were Advanced. PCE Was Detected In Soil At Up To 1.50 Mg/Kg. TCE Was Detected In Only One Soil Sample At 0.21 Mg/Kg. PCE Was Detected In Two Grab Gw Samples At 17 µg/L And 360 µg/L, And TCE Was Detected In Two Grab Gw Samples At 1.6 µg/L And 41 µg/L. In July 2007, Interior Soil Borings, B-7 Through B-9 And Exterior Soil Borings B-10 Through B-19 Were Advanced. The Total Depth Of The Interior Borings Did Not Exceed 8 Feet Bgs, While The Total Depth Of The Exterior Borings Ranged From 18 Feet Bgs To 35 Feet Bgs. 23 Soil Samples And Nine Grab Gw Samples Were Collected. With The Exception Of PCE Detected In Soil At Low Concentrations Up To 0.010 Mg/Kg, No Vocs Were Detected In The Soil Samples. PCE Was Detected In The Grab Gw Samples At Up To 7.6 µg/L. On 9/10-11/08, Soil Vapor Samples From Points Vp-1 Through Vp-13 Were Collected. PCE Was Detected In Ten Of The 13 Soil Vapor Samples At Concentrations Ranging From 3.7micrograms Per Cubic Meter (µg/M3) To 910 µg/M3. TCE Was Detected In Two Soil Vapor Samples At 65 µg/M3 And 230 µg/M3. PCE Was Detected In Only One Soil Vapor Sample Exceeding The Residential Environmental Screening Level (Esl) Of 410µg/M3. In October 2010, GeologiCAl Analytics Collected A Water Sample From A Tap Associated With An Irrigation Well Located At The Sloat Garden Center, Approximately 50 Feet Northeast Of The Site. No PCE, TCE Or Other ChemiCAls Of Concern Were Detected In This Water Sample. Between November 2010 And February 2011, Soil Vapor Samples Were Collected From Vp-14 To Vp-35. PCE Was Detected At Levels Exceeding The Residential Esl Of 410µg/M3 In Five LoCAtions, Mostly Along The Sanitary Sewer Line On The East Side Of Wilson Avenue. The PCE Concentrations Attenuate With Distance From The Sewer Line. For All Soil Gas Results Above 410µg/M3, Soil Gas Samples Were Taken Away From The Sewer Line Closer To All Nearby Residential Dwellings. All Of The Soil Gas Samples Closer To These Residential Dwellings Contained PCE Soil Gas Concentrations Below 410µg/M3. Based On The Following, CAse Closure For This Site Is Considered To Be Appropriate: (1) The Site Has Been Adequately Investigated; (2) There Is No Remaining Source Of PCE Or TCE; (3) Site Investigation Results IndiCAte That Residual Impacts To Soil And Groundwater Are Minimal And Limited To The Immediate Vicinity Of The Dry Cleaner; (4) No Vocs Identified At The Subject Site Have Been Detected In The Nearby Irrigation Well Located 50 Feet From The Site; (5) Potential SignifiCAnt Impacts To Soil Vapor Appear To Be Limited To The Immediate Vicinity Of The Sanitary Sewer. (6) The Nature And Extent Of PCE Impacts Do Not Warrant Active Remediation (7) Results From Human Health Risk Assessments Completed In 2009 And 2011 IndiCAte That Potential CArcinogenic And Non-CArcinogenic Risks Associated With PCE And TCE Present Is Subsurface Media Are Below Widely Accepted Threshold Levels. The Risk Assessments Considered Exposure Via Ingestion Of Soil, Dermal Contact With Soil, Ingestion Of Groundwater, Dermal Contact With Groundwater, Inhalation Of Groundwater, And Inhalation Of Indoor Air; And (8) Base Upon The Current Residual Concentrations In Soil And Groundwater Along With Implementation Of The Site-Specific Land Use Restrictions (Deed Restriction) And The Site Risk Management Plan, This Site Do Not Represent A Current Or Future Public Health, EcologiCAl, And Water Resources Threat. Site Assessment/Site Investigation, Subsurface Monitoring Subsurface Investigation Change Operating Procedures CAr CAre Center 400 Enfrente Rd Ignacio CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Bucks Landing 665 San Pedro Rd N San Rafael CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Chevron 100 Marinwood Ave San Rafael CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Marin Sanitary Service 1050 Andersen Dr San Rafael CA Waste Oil / Motor / Hydraulic / LubriCAting Aquifer Used For Drinking Water Supply, Other Groundwater (Uses Other Than Drinking Water), Under Investigation Tank Closure Novato Dod Housing - Novato Former Ust Site 957 957 C Street Novato CA Benzene, Toluene, Xylene, Mtbe / Tba / Other Fuel Oxygenates, Gasoline Aquifer Used For Drinking Water Supply, Other Groundwater (Uses Other Than Drinking Water), Soil, Surface Water Former Ust Site 957/970 At Dodhf Novato Comprises An Approximate 13 Acre Area. The Site Is The LoCAtion Of Former USTs Which Served A Former Naval Exchange (Nex) Service Station And Former Naval Public Works Center (Pwc) Gas Station. The Nex Gas Station Was In Operation Fro The Mid-1970s Through The Early 1990s, At Which Point The Three Associated USTs (970-1 Through -3) Were Removed. Ust 957 Was Located At The Pwc Gas Station And Was Removed In 1992. These Ust Sites Have Been Combined BeCAuse The Mtbe Groundwater Plumes Underlying These Areas Have Merged And Are No Longer Distinguishable. In April 2010, The Navy Began Injecting Air Into The Leading Edge Of The Plume Located Near The Landfil 26 Site. Mtbe Was Substantially Reduced To Levels That Natural Degradation Of The Mtbe May Be Adequate To Control The Plume. Groundwater Monitoring Will Be Performed To Verify The Remnant Mtbe Contiues To Degrade. Close And Remove Tank San Geronimo Water Treatment Plant 330 San Geronimo Valley Drive San Geronimo CA Gasoline Tank Closure Close And Remove Tank UnoCAl 360 3rd St San Rafael CA Stoddard Solvent / Mineral Spriits / Distillates Other Groundwater (Uses Other Than Drinking Water) Tank Closure Weber Plastering Inc 47 De LuCA Pl San Rafael CA Gasoline Soil Tank Closure John Irish Automotive 475 Francisco Blvd San Rafael CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Sam Zakessian Estate Of 1201 Bridgeway Blvd Sausalito CA Diesel Other Groundwater (Uses Other Than Drinking Water) Tank Closure Shell Station 7473 Redwood Blvd. Novato CA Gasoline Under Investigation Site Assessment/Site Investigation Replace Product Piping Crest Motors 5804 Paradise Dr Corte Madera CA Diesel Other Groundwater (Uses Other Than Drinking Water) Tank Closure Webster Gears 244 Shoreline Highway Mill Valley CA Diesel, Waste Oil / Motor / Hydraulic / LubriCAting Other Groundwater (Uses Other Than Drinking Water), Soil, Under Investigation Property Sale/Transaction, Site Assessment/Site Investigation Phase Ii Investigation Other Means The Facility Is No Longer Operating Pg & E Service Center 1220 Andersen Dr San Rafael CA Waste Oil / Motor / Hydraulic / LubriCAting Other Groundwater (Uses Other Than Drinking Water) Tank Closure UnoCAl Station #7381 375 Ignacio Blvd. Novato CA Diesel Other Groundwater (Uses Other Than Drinking Water) Low Risk Groundwater CAse. Based On The Data Obtained During The Investigations Conducted At The Site Subsequent To 2007, The Site Meets The Criteria Of A Low Risk Gw Site: 1. The Site Is Adequately Characterized. The Soil And Gw Pollution Is Adequately Characterized By Investigations Conducted To Date. 2. Little Or No Groundwater Impact Currently Exists And No Contaminants Are Found At Levels Above Established Mcls Or Other AppliCAble Water Quality Objectives. In September 2007, Six Borings Were Advanced. AnalytiCAl Data From The Soil Samples IndiCAted That All Constituents Tested Were Non-Detectable (Nd, Below The Laboratory?S Reporting Limits) With The Exception Of Lead, Detected At Up To 25.5 Mg/Kg. AnalytiCAl Data From The Groundwater (Gw) Samples IndiCAted That Methyl Tertiary Butyl Ether (Mtbe) And Tphg Were Present In The Groundwater At Concentrations Of 7 Micrograms Per Liter (µg/L) And 55 µg/L, Respectively. In Addition, Tph As Diesel (Tph-D) Was Present In The Groundwater At Up To 22,000 µg/L. In November 2008, 4 Monitoring Wells Were Installed. AnalytiCAl Data From The Soil Samples Collected IndiCAted That All Constituents Tested Were Nd With The Exception Tph-D Detected At Up To 2.1 Mg/Kg. Based On The Latest Results From The Monitoring Wells, The Concentrations Of Pollutants In Gw Are Low (Maximum Of 72 Ug/L Of Tph-G, 91 Ug/L Of Mtbe, And Nd For The Remaining Constituents. To Summarize, No SignifiCAnt Soil Pollution Have Been Detected And The Current Gw Concentrations Are Low Or Nd. 3. No Water Wells, Deeper Drinking Water Aquifers, Surface Water, Or Other Sensitive Receptors Are Likely To Be Impacted. The Groundwater Quality Is Acceptable Under Current Conditions For Groundwater Which Is Not A Potential Source Of Drinking Water. On June 19, 2008 A Field Sensitive Receptor Survey Was Conducted. Sensitive Receptor Results Show That The Distance To The Nearest Wells, The Source Of Public Drinking Water (Russian River), And The Shallow Perched Nature Of The Groundwater IndiCAte The Risk To Drinking Water Resources Is Very Low. 4. The Site Presents No SignifiCAnt Risk To Human Health And The Environment. Delta?S January 7, 2009 Report- Site Conceptual Model And Investigation Report Provides An Evaluation Of Risk Assessment, In Terms Of Risks Associated With Public Health, And The Environment. Assessment Reviewed Potential Pathways Including Dermal Contact With Impacted Soil By Site Construction Workers, Inhalation Of Petroleum HydroCArbons By Soil Vapor, Leaching Of Residual Soil HydroCArbons To Groundwater, And Groundwater Ingestion. Sensitive Receptor Results Show That The Distance To The Nearest Wells, The Source Of Public Drinking Water (Russian River), And The Shallow Perched Nature Of The Groundwater IndiCAte Low Risk To Drinking Water Resources Is Very Low. Based On Findings Documented In The Report, Delta Concludes That The Site Presents No SignifiCAnt Risk To Human Health And The Environment. Subsurface Monitoring Jung Property 114 Mill St San Rafael CA Waste Oil / Motor / Hydraulic / LubriCAting Soil Tank Closure CAltrans 100 Gary Pl San Rafael CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Novato Dod Housing - Novato Housing Bldg. 827-2 Dodhf Novato CA East Fort Baker - Fds C-1 Murray Circle Sausalito CA Mcnear Property 44 Makin Grade Kentfield CA Heating Oil / Fuel Oil Other Groundwater (Uses Other Than Drinking Water) Tank Closure 790 De Long Avenue Property 790 De Long Avenue Novato CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Based On The Following, CAse Closure For This Site Is Considered To Be Appropriate: (1) The Site Has Been Adequately Investigated; (2) The Primary Source Of Petroleum HydroCArbon Pollution At The Site (The Former Ust) Was Removed In September 2007; (3) Most Of The Secondary Sources Of Petroleum HydroCArbon Pollution At The Site (Impacted Soil And Groundwater) Were Removed In 2007 And 2008; (4) The Residual Concentrations Of Petroleum HydroCArbon In Groundwater Has Decreased To Below Levels Of Concern And The Plume Is Stable. In Addition, A Deed Restriction Restricting The Extraction Of Groundwater From The Beneath The Site Has Been Recorded With Marin County; (5) While The Results Of The Soil Gas Survey IndiCAte That Some Of The Detected Soil Gas Petroleum HydroCArbon ChemiCAls Of Concern Exceed The Residential Esls For Soil Gas, The Residual Soil Gas Pollution Do Not Present A SignifiCAnt Risk To Human Health. To Evaluate The SignifiCAnce Of The Benzene Detected In Soil Vapor At Concentrations Greater Than The Residential Esl, Pes Prepared A Screening Level Risk CAlculation Of The Potential Risk To Future Residence That Might Result From Intrusion Of Benzene-Affected Vapors. The Estimated Risk Of Excess CAncers Due To Exposure To Vapor Intrusion Is 2.3 X 10-6, Only Slightly Above The Target Of 1.0 X 10-6. Based On The Results Of The Risk CAlculation, The Estimated Risk From Benzene Via Vapor Intrusion Is Not Considered SignifiCAnt. Also, The Tphg And Tphd Detected In Soil Gas Are Not Considered A SignifiCAnt Health Risk. In Addition, The Source Of The Elevated Tphg, Tphd, And Benzene Concentrations In Soil Vapor Was Subsequently Removed (Via Additional Soil ExCAvation). Although The Risk Posed By The Tphg, Tphd And Benzene Concentrations Was Not SignifiCAnt, Dni Opted To Install A Vapor Intrusion Barrier Beneath The Concrete Floor Slab Of The At-Grade Residential Units And Common Areas; (6) The Residual Concentrations In The Soil, Groundwater, And Soil Gas Do Not Represent A Current Or Future Public Health, EcologiCAl, And Water Resources Threat. In Addition, To Ensure That Future Activities Will Not Present A Threat To Public Health, EcologiCAl, And Water Resources, A Risk Management Plan (Rmp), Dated June 2, 2009, Has Been Developed For This Site And Is Part Of The Deed Restriction. The Rmp Contains Guidelines For Management Of Soils, Soil Vapor, And/Or Groundwater Encountered During Post-Development Activities, And Procedures To Be Followed In The Event A Vapor Barrier Is Punctured Or Damaged. Tank Closure Close And Remove Tank Nat Park Serv Mcisaac Ranch 9490 Sir Francis Drake Blvd Olema CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Former Fairchild Semiconductor Facility 4300 Redwood Highway San Rafael CA Other Groundwater (Uses Other Than Drinking Water), Soil, Soil Vapor, Surface Water In 1960, Fairchild Semiconductor Corporation (Fairchild) Constructed A Semiconductor Manufacturing Facility At The Site. Fairchild Occupied The Property Until 1988 When Manufacturing Operations At The Site Were Discontinued. In 1995, The Facility Was Demolished And The Site Remained Unoccupied Until 2004. In 2001, 4300 Redwood Road Venture, Llc (Redwood Venture) Purchased The Property. Redwood Venture Began Construction Of New Commercial Buildings At The Site In 2003 And Completed The Redevelopment In 2005. The Site Currently Contains 16 Commercial Buildings For Offices And Warehouses. In 1982, Fairchild Began Soil And Groundwater Investigations At The Site And Discovered That Soil And Groundwater At The Site Were Impacted By Volatile Organic Compounds (Vocs). The Primary Vocs Found Were Trichloroethene, 1,2-Dichloroethene, And Vinyl Chloride. In 1984, An Underground Slurry Wall Was Constructed Around The Perimeter Of The Site To Contain The Groundwater. Approximately 1,500 Cubic Yards Of Soil Were ExCAvated From The Site. In 1985, A Groundwater Extraction And Treatment System (Gwets) Was Installed. In 1989, Two Groundwater Extraction Trenches And A New Treatment System Consisting Of Six Granular Activated CArbon (Gac) Vessels Were Installed. The New Gwets Was Put Into Operation In 1989 And Has Been In Operation Since Then. A Final Remedial Action Plan (Frap) For The Site Was Submitted To The Water Board In 2000. The Water Board Approved The Frap And Issued Final Site Cleanup Requirements Order 00-122 In November 2000. Implementation Of The Final Cleanup Plan Commenced In 2001 And Was Completed In March 2005 When The Redevelopment Of The Site Was Completed. Additional Remedial Measures That Were Implemented Included Shallow Soil ExCAvation And Removal To A Landfill, Installation Of Drainage Layers, Installation Of Vapor Barriers Beneath All Buildings, Institutional Control Of Property Use (Including Land Use Restriction), Installation Of A Sub-Slab Depressurization System And Soil Venting Pipelines. Groundwater And Air Quality At The Site Are Monitored Regularly. Based On These Monitoring Data, The Site Cleanup Programs Are Performing As Designed. Human Health And Nearby Gallinas Creek The Site Are Not At Risk. Site Assessment/Site Investigation, Subsurface Monitoring Other Means Nike Battery 93, Sf (J09CA094400) - Aoi 5 S-217 Ust, Administrative Area 290 Smith Ranch Rd San Rafael CA Diesel According To A General Site Map Of The Usace Air Defense Missile Site Sf-93 (1970), A 550- Gallon Diesel Ust (S-217) And Associated Appurtenances (Figure 5-7) Were Formerly Located On The West Side Of The Former Enlisted Barracks (S-200). The Following Information Was Provided In A ?Site Closure Report? Prepared By Cky, Inc. In October 1996 For The Usace. The Ust And Associated Appurtenances Were Removed On 27 July 1995 By Cky, Inc. At The Time Of Removal, The Tank Was Nearly Full With Diesel Fuel. The Piping And Tank Were Flushed With Water From A High-Pressure Washer And Transported Off-Site For Disposal. Groundwater Was Not Encountered In The Ust ExCAvation Pit At The Time Of Removal. No Holes Were Observed At The Bottom Of The Tank; However, The Removed Soil Had A Distinct HydroCArbon Odor, And Stained Soil Was Found At The Walls And The Bottom Of The ExCAvation. The ExCAvated Soil Stockpile Was Placed On Visqueen Plastic Sheeting And Covered With Visqueen Until It Was Hauled Off-Site On 22 June 1996. At The Time Of Tank Removal, One Confirmatory Soil Sample Was Collected And On 22 January 1996, One Groundwater Sample Was Collected; Both Samples Were Collected From The Bottom Of The Ust ExCAvation Pit. Both Samples Were Analyzed For Tph-D Using Modified Epa Method 8015 And Btex Using Epa Method 8020. Soil Sample Results (Appendix F) IndiCAted A Concentration For Tph-D Of 5,600 Ppm And Were Non-Detect For Btex. Groundwater In The ExCAvation Pit, Which Contained Less Than 1 Ppm Tph-D And Non-Detectable Concentrations Of Btex, Was Discharged Into The Sanitary Sewer On 25 June 1996. Ms. Linda CAnedelaria, Of The Lgvsd, Approved Discharging The Groundwater After Reviewing The AnalytiCAl Results On 1 February 1996. After Groundwater Removal, Approximately 2 Cubic Yards Of Mud Were Removed From The ExCAvation Pit And Added To The Existing Soil Stockpiles For Later Off-Site Disposal. The ExCAvation Pit Was Backfilled With Approximately 2 Feet Of Imported Clean Pea Gravel At The Base, Lined With Visqueen, Filled To 6 Inches Below Grade With Imported Soil, And Covered With Topsoil From The Nearby Area To Match The Existing Grade. Tank Closure Nike Battery 93, Sf (J09CA094400) - Aoi 6 S-218 Ust (And Fuel Line), Administrative Area 290 Smith Ranch Rd San Rafael CA Soil According To A General Site Map Of The Usace Air Defense Missile Site Sf-93 (1970), A 550-Gallon Diesel Ust (S-218) And Associated Appurtenances (Figure 5-8) Were Formerly Located On The North Side Of The Former Enlisted Barracks (S-201). The Following Information Was Provided In A ?Site Closure Report? Prepared By Cky, Inc. In October 1996 For The Usace. The Ust And Associated Appurtenances Were Removed On 5 January 1996 By Cky, Inc. At The Time Of Removal, The Tank Was Almost Full With Diesel Fuel. The Piping And Tank Were Flushed With Water From A High- Pressure Washer And Transported Off-Site For Disposal. Several Holes Larger Than A Quarter Were Observed On The Tank. Stained Soil With A Petroleum HydroCArbon Odor Was Found At The Walls And The Bottom Of The ExCAvation Pit. ExCAvated Soil Was Placed On Visqueen Plastic Sheeting And Covered With Visqueen Until It Was Hauled Off-Site On 22 June 1996. At The Time Of Removal, One Confirmatory Soil Sample And Groundwater Sample Were Collected, Both From The Bottom Of The Ust ExCAvation Pit. Both Samples Were Analyzed For Tph-D Using Modified Epa Method 8015 And For Btex Using Epa Method 8020. Soil Sample Results (Appendix F) IndiCAted Concentrations Of 19,000 Ppm Tph-D, No Benzene, 1,500 Ppb Toluene, 1,500 Ppb Ethylbenzene, And 4,000 Ppb Total Xylenes. Groundwater Was Encountered At 5 To 6 Feet Bgs In The ExCAvation At The Time Of Removal. Analysis Of The Groundwater Sample Showed Concentrations Of 250,000 Ppb Tph-D, 2.89 Ppb Benzene, Non-Detect For Toluene, 2.0 Ppb Ethylbenzene, And 3.9 Ppb Total Xylenes. Groundwater In The ExCAvation Pit Was Removed With A Vacuum Truck On 24 June 1996. After Groundwater Removal, Approximately 2 Cubic Yards Of Mud Were Removed And Added To The Existing Soil Stockpiles For Off- Site Disposal. The ExCAvation Pit Was Backfilled With Approximately 2 Feet Of Imported Clean Pea Gravel At The Base, Lined With Visqueen, Filled To 6 Inches Below Grade With Imported Soil, And Covered With Topsoil From The Nearby Area To Match The Existing Grade. Facility Inspection, Tank Closure Close And Remove Tank, Remove Contents Apollo Cleaners 160 Donahue Street Marin City CA Tetrachloroethylene (PCE) Under Investigation * Other Means Pollution Discovered During Subsurface Investigation Marin Cleaners 520 4th Street San Rafael CA Other Chlorinated HydroCArbons, Tetrachloroethylene (PCE), Trichloroethylene (TCE) Indoor Air, Other Groundwater (Uses Other Than Drinking Water), Soil, Soil Vapor The Subject Property (Site) Is Located At 520 Fourth Street In San Rafael, Marin County, CAlifornia, And Is Occupied By Marin Cleaners, A Drop-Off And Pick-Up Facility. Land Use In This Area Is Generally Residential, Commercial And Retail. Topography In The Site Vicinity Slopes Gently To The Southeast Towards The Novato, Bay. The Bay Is Located Approximately 1.5-Miles To The South/Southeast. San Rafael Creek Is Located Approximately 850 Ft To The South Of The Site. Site Use The Dry Cleaner At This LoCAtion Previously Used The Common Dry Cleaning ChemiCAl Tetrachloroethene, Also Known As PCE (A Hvoc) Or ?Perc? In Their Site Operations From Approximately 1955 Until March 2000 When The Dry Cleaning Machines Were Removed And The Site Was Converted To A Drop-Off And Pick-Up Facility Only. Results Previous Investigations IndiCAted That There Was A Release Of Hvocs From The Marin Cleaners. Elevated Concentrations Of PCE And Its Breakdown Or ?Daughter? Products, Trichloroethene (TCE), Dichloroethene And Vinyl Chloride Were Detected In Shallow Soils And Groundwater Beneath The Site. Several Of These ChemiCAls Are CArcinogenic And The Concentrations Found In The Soil And Groundwater Are Of Concern. * Other Means Detected When Sampling A Ust Site Across The Road (21-0146) Change Operating Procedures Now A Drop Off LoCAtion Only Ferraro Fairfax Service 1942 Sir Francis Drake Blvd. Fairfax CA Gasoline Indoor Air, Other Groundwater (Uses Other Than Drinking Water), Soil Vapor Tank Closure Close And Remove Tank Allen Heating & Sheet Metal 36 Industrial Wy Greenbrae CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Other Means Wells Property 60 Seaview W San Rafael CA Diesel Other Groundwater (Uses Other Than Drinking Water) Tank Closure Chevron 706 Tamalpais Dr Corte Madera CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Fireman's Fund Insurance 777 San Marin Dr Novato CA Diesel Other Groundwater (Uses Other Than Drinking Water) Tank Closure Alfa Gas Station 1789 Sir Francis Drake Blvd Fairfax CA Gasoline Aquifer Used For Drinking Water Supply, Other Groundwater (Uses Other Than Drinking Water) Tank Closure Close And Remove Tank East Fort Baker - Fds C-10 636 Mcreynolds Rd. Sausalito CA Ups Former 635 Lindaro St San Rafael CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Chevron 5810 Nave Drive Novato CA Gasoline Other Groundwater (Uses Other Than Drinking Water) The Site Is A Former Chevron Service Station Located At The Northwest Corner Of Present Day Nave Drive And Roblar Drive In Novato, CAlifornia. The Service Station Facilities Were Removed From The Site In 1984. The Site Currently Contains A Bus Stop And VaCAnt Land Located Adjacent To Union Pacific Railroad Tracks. The Former Service Station Consisted Of A Station Building, Two Dispenser Islands, Three Gasoline Underground Storage Tanks (USTs), And A 550-Gallon Waste Oil Ust. Environmental Investigation And Remediation Has Been Ongoing Since 1983. To Date, 11 Monitoring Wells Have Been Installed (Six Of Which Have Been Destroyed), Seven Soil Borings Have Been Advanced And Soil Vapor Probes Have Been Installed At Two LoCAtions. In June 1983, During A Tank Tightness Test, A Leak Was Discovered In The Product Lines. In July 1983, Gettler-Ryan (G- R), On Behalf Of Chevron, Installed Groundwater Monitoring Wells 1 Through 5. In February 1984, The Station Was Closed And Surface And Subsurface Facilities Were Removed. Groundwater Monitoring Continued Through August 1984. Monitoring Wells Mw-1 Through Mw-3 Were Installed On The Former Site In 1998. Tank Closure Marin County Airport Gnoss Field 451 Airport Rd Novato CA Diesel Other Groundwater (Uses Other Than Drinking Water) Gnoss Field Is A Small Airport In Novato Constructed On Filled Wetlands And Is Surrounded By Open Fields And Marshlands. One Jet Fuel And Two Aviation Gasoline USTs Were Removed In 1991. The USTs And Product Lines Were Pitted And Had Holes In Them. Two Grab Groundwater (Gw) Samples From The Ust Pit Contained Up To 7,900 Ppb Of Tph-G, 5,900 Ppb Of Tph-D, And 130 Ppb Of Benzene. Four Borings Were Installed On May 31, 1995, And Nine Additional Borings Were Installed On July 5, 1995. Grab Gw Samples From The Borings Contained Up To 1,100 Ppb Of Tph-D, 810 Ppb Of Tph-G, 4,000 Ppb Of Total Petroleum HydroCArbons As Bunker C Fuel (Tph-B), 30,000 Ppb Of Jet Fuel (Tph-Jf), And 51 Ppb Of Benzene. Soil Samples Contained Up To 1,300 Mg/Kg Of Motor Oil (Tph-Mo) With Low Concentrations Of Tph-G, Tph-D, Tph-B, And Benzene. In 1999 During ExCAvation Work To Replace A Section Of The Storm Drain Sewer Line, Gw With A Sheen And Solvent-Like And Petroleum Odors Were Encountered. Sixty Three Tons Of Soil And 9,600 Gallons Of Gw Were Subsequently Removed From The ExCAvation And Transported Off-Site To Proper Disposal Facilities. Soil Samples Of The ExCAvated Soil Contained Up To 570 Mg/Kg Of Tph-G, 750 Mg/Kg Of Tph-D, 750 Mg/Kg Of Tph-Kerosene, 1,100 Mg/Kg Of Tph-Mo, 1,300 Mg/Kg Of Tph-B, And Non-Detectable Concentrations Of Benzene. Soil Confirmation Samples From The Final Limits Of The ExCAvation Contained Much Lower Concentrations Of The Aforementioned Compounds. A Grab Gw Sample From The ExCAvation Contained 960 Ppb Of Tph-G, 890 Ppb Of Tph-D, 820 Ppb Of Tph-K, 1,100 Ppb Of Tph-B, 1.4 Ppb Of Benzene, And Non-Detectable Concentrations Of Tph-Mo And Mtbe. A 2009 Sensitive Receptor Survey (Srs) IndiCAtes That The Site Is Surrounded By Wetland/Saltwater Marsh Surface Water Bodies With The Nearest Surface Water Body Being An Unnamed Drainage Ditch Located 550 Feet West-Southwest Of The Former USTs And A Strip Of Marsh That Is 1,050 Feet South Of The Former USTs. The Srs IndiCAted That There Were No Water Wells Within 1,000 Feet Of The Former USTs. An Additional Subsurface Investigation Conducted January 28, 2010, Included The Collection And Analysis Of Soil And Gw Samples From Ten Soil Borings (B-14 Through B-23, Plate 2) Advanced Around The Former USTs And Beyond The LoCAtions Of Borings Drilled In 1995. Following Completion Of The Investigation, The Following Conclusions Were Presented: ? Although Constituents Of Concern Were Detected In Select Soil Samples, All Concentrations Were Below The Esls For Shallow Soil As Established By The Novato, Water Board, Where Gw Is Not A Current Or Potential Drinking Water Resource. Further, Tph Detected In Soil During The 1995 Investigation Were Below Esl?S. ? Soil Impacted With Petroleum HydroCArbons Likely Remains In The Area Immediately Surrounding The Former USTs. Concentrations Present In Soil Samples Collected In 2010 Are Generally Lower Than Those Collected Closer To The Former USTs In 1995. ? The Lateral And VertiCAl Distribution Of Contamination In Gw Has Been Defined To The East, South And West Of The Former Ust ExCAvation Area. A Gw Sample Collected From A Boring (B-21) Located To The North Of The Former Ust?S Contained Concentrations Of Tph Above Sf Bay Esl?S; However, The Concentration Is SignifiCAntly Lower Than A Sample Collected Closer To The Tank ExCAvation In 1995 IndiCAting The 2010 Boring (B-21) Is Located Close To The Northerly Extent Of Gw Contamination. ? With The Exception Of B21-W And Two Other Samples Containing Toluene Below Sf Bay Esls, All Gw Samples Were Non-Detect For Constituents Of Concern. ? Though 18 Years Have Passed Since The 1995 Investigation, Contaminants In Gw Were Not Detected, Or In One CAse Have Decreased SignifiCAntly, In The Step Out Borings. ? The Distribution And Spread Of Soil And Gw Impacts Does Not Appear To Be Influenced By Nearby Subsurface Utilities. ? According To The Srs, No Municipal Or Private Wells Are Located Within 1000 Feet Of The Site. Based On The Following, CAse Closure For This Site Is Considered To Be Appropriate: (1) The Site Has Been Adequately Investigated; (2) The Primary Source (The Three USTs That Formerly Occupied This Site) Was Removed In 1991; (3) The Secondary Source (The Impacted Soil Surrounding The Former USTs) Material Has Been Removed To The Degree PractiCAble And Disposed Of Offsite; (4) The Lateral Extent Of Fhc-Impacted Soil And Groundwater Has Been Adequately Characterized And The Gw Plume Is Stable Or Decreasing And Is LoCAlized And Not Migrating Off-Site; (5) Sensitive Receptors And Migration Pathways That Could Be Impacted By The Release Have Been Identified And Are Not Impacted Or Threatened By The Residual Pollution; (6) The Absence Of Benzene And Very Low Concentrations Of Toluene, Ethylbenzene, And Xylenes In Soil And Groundwater, And The LoCAtion Of The Residual Fhc Impacts Beneath Paving And Outside Of Building Footprints, Precludes A Potential Vapor Intrusion Problem; And (7) There Is Little Likelihood That The Shallow Groundwater Will Be Used As A Drinking Water Supply In The Near Future. The Use Of The Subject Site As An Airport Is Not Likely To Change In The Future There Is A Small But Easily Manageable Risk To Human Health If ExCAvation/Construction Activities Are Conducted In The Vicinity Of The Former USTs ExCAvation. The Potential Risk Would Be Mitigated By Preparing A Soil And Groundwater Management Plan (Sgmp). The Sgmp Would Describe Procedures To Notify The Appropriate Regulatory Agencies, Protect Worker?S Health, And Manage Impacted Soil And/Or Groundwater If It Is Encountered; And (8) The Residual Concentrations In The Soil And Groundwater Apparently Do Not Represent A Current Or Future Public Health, EcologiCAl, And Water Resources Threat.At The Site. Tank Closure Independent Gas Station 5 Ashford Ave Mill Valley CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Elena Iacono RevoCAble Trust 95 John St Tomales CA Gasoline Aquifer Used For Drinking Water Supply Ozone Started 9/10/2007, As Of 4/16/09 Sve Has Not Started Tank Closure Point Tiburon Innisfree Company 1920 Paradise Dr Tiburon CA Dowd's Barn 157 Throckmorton Ave Mill Valley CA Gasoline Soil Tank Closure Rich Electric 110 CArlos Dr San Rafael CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Shell 7300 Redwood Blvd Novato CA Waste Oil / Motor / Hydraulic / LubriCAting Other Groundwater (Uses Other Than Drinking Water) See Site Closure Summary Dated June 28, 2013 (For Relevant Site Information Summaries And Site History). The Site Closure Summary Is Part Of The July 3, 2013, Closure Package Tank Closure Chevron/Redwood Oil Bulk Plant 11095 State Route 1 Point Reyes CA Diesel, Gasoline, Kerosene, Other Petroleum Other Groundwater (Uses Other Than Drinking Water), Soil The Site Is Located On CAlifornia Highway 1 In Point Reyes And Currently A Tile Company Operates At The Site. A Fuel Bulk Terminal Previously Occupied The Site From 1923 Thru 1990. In 1999, All Five Asts And Associated Product Piping Were Removed From The Site. The Asts And Piping Were Reported To Be In Good Condition At The Time Of Removal. Based On Visible Evidence Of Surficial Staining, About 50 Cubic Yards Of Soil Were Removed From The Loading Rack And Fill Pipe Area. Final Confirmation Soil Samples Contained Up To 1,000 Mg/Kg Of Tph-D And 220 Mg/Kg Of Tph-K. Tph-G And Benzene Were Below Detection Limits. One Monitoring Well (Mw) Was Installed At The Site In August 1999. Fifteen Soil Borings Were Installed At The Site In 1990 And May 2000. A Grab Groundwater (Gw) Sample From One Of The Soil Borings (Sb-6) Installed In May 2000 Contained 440,000 Ppb Tph-G And 12,000 Ppb Of Tph-D. Four Monitoring Wells Were Also Installed At The Site In February 1991 And April 2004. The Nearest Surface Water Bodies Are Arroyo San Geronimo, A Seasonal Lagoon, Located About 600 Feet Southeast Of The Site, And Lagunitas Creek, A Perennial Creek, Located 700 Feet Southeast Of The Site. As Of The Last Annual Monitoring And Sampling Event (2010), All Mws Were Either Non- Detect Or Slightly Above Detection Limits, Well Below Environmental Screening Levels (Esls). It Appears That The Gw Concentrations Detected In Sb-6 Are Not Representative Of The Actual Gw Concentrations At The Site For The Following Reasons: (1) The Investigation Report Reported That The Sample From Sb-6 Was Turbid. It Is Likely That The Turbidity Of The Sample Adversely Affected The AnalytiCAl Results; (2) Both Mw-4, Located 20-Feet Crossgradient, And Mw-5, Located 25-Feet Downgradient Of Sb-6 Have Consistently Contained Much Lower Concentrations That Sb-6; And (3) Soil Samples From B-5 (10-Feet Crossgradient Of Sb-6) Contained No Tph-G And Only Trace Amount Of Tph-D At 2.9 Mg/Kg. Based On The Following, CAse Closure For This Site Is Considered To Be Appropriate: (1) The Site Has Been Adequately Investigated; (2) The Primary Source (The Five Agts That Formerly Occupied This Site) Were Removed In 1999 And No Further Storage Of Petroleum HydroCArbons Has Occurred Since That Time; (3) The Secondary Source (Impacted Soil) Were Also Removed In 1999; (4) The Gw Plume Is Decreasing And Residual Concentrations In Gw Is Very Low; (5) There Is Little Likelihood That The Shallow Groundwater Will Be Used As A Drinking Water Supply In The Near Future; And (6) The Residual Concentrations In The Soil And Groundwater Apparently Do Not Represent A Current Or Future Public Health, EcologiCAl, And Water Resources Threat. Site Assessment/Site Investigation, Subsurface Monitoring Close And Remove Tank, Other Means Chevron 69 Mitchell Blvd San Rafael CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Paradise CAy 127 Trinidad Dr Tiburon CA Gasoline Other Groundwater (Uses Other Than Drinking Water) In May 2000, A Complaint By A Nearby Resident (122 Trinidad Drive) To The Marin Water District Regarding A Slight Odor Of Gasoline In Their Tap Water Prompted The District To Replace The Plastic Delivery Pipe With One Made Of Copper. The Marin Water District Noted That Groundwater (Gw) In Their ExCAvation Had A Petroleum Odor. Following Replacement Of The Water Pipes, Two Water Samples From 122 Trinidad Drive On 6/5/00 And 1/26/01 Both Contained Non-Detectable (Nd) Concentrations Of Tph-G And Btex. On 6/15/00 The Property Owner Of 127 Trinidad Drive ExCAvated And Removed 1-1000 Gallon Gasoline Ust. Approximately 250 Gal. Of Product Resembling Gasoline Was Removed From The Tank Prior To ExCAvation. Upon ExCAvation, Holes Were Noted In The Ust And The Exterior Of The Ust Was Stained. The Tank Area Was Over ExCAvated And Approximately 125 Cubic Yards Of ExCAvated Soil Were Aerated For Two Weeks And Then Taken To A Landfill. The Soil Samples In The Sidewalls Of The Tank ExCAvation Contained Maximum Concentrations Of 850 Mg/Kg Of Tph-G, 2.8 Mg/Kg Of Benzene, 0.37 Mg/Kg Of Mtbe, And 7.7 Mg/Kg Of Naphthalene (Table 1). 15 Geoprobe Borings Were Advanced At The Site In Jan. 2001. Only One Soil Sample (From Hp- 5 @ 6?) Contained Detectable Concentrations Of Tph-G And Btex And Only At Low Concentrations. The Gw Grab Sample From Hp-5 Contained 130,000 Ppb Of Tph-G, 12,000 Ppb Tph-D, 1,400 Ppb Of Benzene, And 540 Ppb Of Naphthalene. Hp-4 Also Contained Elevated Concentrations Of Tph-G, Tph-D, Btex, And Naphthalene (Table 4 And Figure 8). Four Gw Monitoring Wells (Mws) Were Installed At The Site On 8/30/01. Two Of The Mws Were Installed In The Vicinity Of Hp-4 And Hp-5. The Mws Contained Total Dissolved Solids (Tds) At Up To 20,000 Mg/L IndiCAting That The Gw Is Not A Potential Source Of Drinking Water. These 4 Mws Were Monitoring For 6 Consecutive Quarters With Decreasing Concentrations Of Tph-G And Btex. The Last Mw Sampling Event In June 2003 IndiCAted That Tph-G Was Present At 210 Ppb And Xylenes At 1.9 Ppb. All Other Btex Compounds, Mtbe And Other Fuel Oxygenates, Tph-D, Lead SCAvengers, And Napthalene Were Nd. Closure For This Site Is Appropriate BeCAuse (1) The Ust Release(S) Has Been Adequately Investigated, (2) The Primary Source (The USTs) And The Secondary Source (Polluted Soil) Were Removed In 2000, (3) No Free Product Were Detected After Ust Removal And Soil ExCAvation Activities, (4) The Groundwater Plume Has Been Defined And Is Stable Or Decreasing, (5) No Domestic Water Wells Were Noted Within ½ Mile Of The Site (6) The Concentrations Of The Pollutants In Soil And Gw Remaining At The Site Is Low Or Non-Detectable, Will Continue To Decline Due To Natural Attenuation, And Does Not Represent A Public Health, EcologiCAl, Or Water Resources Threat. This Is Considered A Low Risk Ust CAse. Nuisance Conditions Flea Market Property 100 Donahue St Marin City CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Rab Motors/CAltrans 550 Francisco Blvd. West San Rafael CA Diesel, Mtbe / Tba / Other Fuel Oxygenates, Waste Oil / Motor / Hydraulic / LubriCAting Other Groundwater (Uses Other Than Drinking Water) * Other Means Pacific Bell 220 Shaver St San Rafael CA Diesel Other Groundwater (Uses Other Than Drinking Water) Tank Closure Fort Barry - Ggnra Fort Barry (J09CA310700) - A Parent Fort Barry, Golden Gate National Recreation Area Sausalito CA Benzene, Toluene, Xylene, Diesel, Gasoline, Heating Oil / Fuel Oil, Kerosene, Waste Oil / Motor / Hydraulic / LubriCAting Soil Fort Barry Was Used For U.S. Military Purposes From 1866 Through 1965. The Land Is Presently Under Control Of The Golden Gate National Recreation Area (Ggnra). Ten USTs And One Above-Ground Storage Tank (Ast) Located At Six Former Ust Sites Were Identified In The Inpr; In Addition, Two Other USTs Were Subsequently Discovered At Battery Wallace (See Geotracker # T0609592140). The Twelve USTs And Associated Contaminated Soils Were Removed, And The Ast Drained And Closed In Place. The Final Preliminary Assessment (November 2001) Found That Of These Six Sites, Only Two Sites (Ust F-2 And Ust F-9) Showed Impacted Native Soils Below The Depth ExCAvated And Recommended For Further Investigation. The Final Site Inspection Report (September 2003) Describes Investigation Activities At Ten Of The Fifteen Areas Identified As Warranting Further Investigation In The Pa. Six Of These Investigated Areas Are A Part Of The Petroleum Program. These Include Four Underground Storage Tank Sites: Tank F-2, Nike Facility; Tank F-9, Battery Hill 129; A Suspected Ust At The Gasoline Station; And A Suspected Ust At Battery Mendell. The Other Two Areas In The Petroleum Program Are The Nike-Fueling Area And The Gasoline Station Dispensing Area. There Was Also A Natural Gas-Fuel Oil Line Found To Run Through The Fort, Which Is Also Identified As An Area Of Concern. All Petroleum-Only Sites Are Being Managed Under The Petroleum Sites Management Plan, And Are Regulated By The Rwqcb. Tank Closure Close And Fill Tank In Place, Close And Remove Tank East Fort Baker - Bldg 699 699 Sommerville Road Sausalito CA Gonzales Landfill 5749 LuCAs Valley NiCAsio CA Forest Knolls Garage 6700 Sir Francis Drake Blvd Forest Knolls CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Texaco 2400 Sir Francis Drake Blvd Fairfax CA Diesel Soil Tank Closure Marin/Sonoma Mosquito (Former) 201 Third St San Rafael CA Diesel Other Groundwater (Uses Other Than Drinking Water) Dtsc Is Lead On This CAse, Some HydroCArbons In Soil & Water At Site. The Site Is CApped As A Parking Lot. * Unk Uscg Bolinas Facility 525 Mesa Rd Bolinas CA Diesel Other Groundwater (Uses Other Than Drinking Water) Tank Closure Tosco - Facility #5491 930 Sir Francis Drake Blvd San Anselmo CA Stoddard Solvent / Mineral Spriits / Distillates Soil Tank Closure Tile West 11 Hamilton Dr Novato CA Diesel Other Groundwater (Uses Other Than Drinking Water) Tank Closure Samuel Taylor Park Unknown Samuel Taylor Park Lagunitas CA Gasoline Other Groundwater (Uses Other Than Drinking Water) The Subject Property (Site) Is A CAlifornia State Recreational Facility Located 400 Linear Feet From The Southern Bank Of Lagunitas Creek, Just North Of CAmp Taylor On Sir Francis Drake Blvd In Samuel P. Taylor State Park Just South Of A Township, Jewell Near Lagunitas, Marin County CAlifornia. Site Facilities Include A Auto Shop Structure, Office And Supply Building, A 2,000-Gal Above Ground Storage Tank (Ast), Equipment Storage Shed, And CAnopy- Covered Liquid Storage Unit. Former Underground Storage Tanks (USTs) Included A 1,000-Gal Gasoline Tank, And 550-Gal Diesel Tank. In Nov. 1996, A 2,000-Gal Gasoline Ust And 550-Gal Diesel Ust Were Removed Off Site. Environmental Investigation Work Began In 1996 And Found Concentrations Of Petroleum HydroCArbons In Soil And Groundwater. Concentrations Of Up To 82,000 Mg/Kg Total Petroleum HydroCArbons As Gasoline (Tphg), 250 Mg/Kg Benzene, And 9,600 Mg/Kg Xylenes. Groundwater Concentrations Recorded Up To 20,000 Ug/L Tphg, 1,000 Ug/L Benzene, And 3,300 Ug/L Xylenes. The Geology Of The Site Is Interbedded Silts And Clays, 10-20 Ft Thick, With Fractured Siltstone Bedrock At An Approximate Elevation Of 110 Feet Above Mean Sea Level (Asl). Gravels And Cobble Dominate The Proximal Areas Adjacent To The Lagunitas Creek Channel, With Some Exposures Of Bedrock At Or Nears The Surface (2.8 Feet Bgs). Environmental Investigation Continues. Tank Closure Village Faire 777 Bridgeway Ave Sausalito CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Ggnra, Marin Headlands, Ust No. 841 0 Bunker Road Marin Headlands, Ggnra CA Diesel, Waste Oil / Motor / Hydraulic / LubriCAting Other Groundwater (Uses Other Than Drinking Water) Former Ust No. 841 Was One Of Six USTs Originally Used To Store Fuel To Power The Sewage Lift Station System Into The Sausalito Wastewater Treatment Plant. The USTs BeCAme Obsolete When Natural Gas Lines Were Installed To Fuel The Sewage Lift And Water Pump Systems. All Six USTs Were Removed In 2009. Soil And Grab Groundwater Samples From The Other Five USTs IndiCAte That Any Residual Pollution Does Not Pose A SignifiCAnt Threat To Human Health Or The Environment. One Soil Sample From Beneath Former Ust No. 841 Contained Low Or Non-Detectable (Nd) Concentrations Of Luft 5 Metals, Tph, Btex, And Other Vocs. One Grab Groundwater Sample From The ExCAvation After It Was Purged And Allowed To Refill Contained Non-Detectable (Nd) Concentrations Of Tph-G, 26,000 Ppb Of Tph-D, 79,000 Ppb Of Tph-Mo, And Nd Concentrations Of Btex. Subsurface Monitoring, Tank Closure Close And Remove Tank Sausalito Fire Dept 333 Johnson St Sausalito CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Big 4 Rents Inc 5750 Paradise Dr Corte Madera CA Diesel Other Groundwater (Uses Other Than Drinking Water) Tank Closure Marinship Self-Storage 2340 Marinship Way Sausalito CA Chromium, Copper, Lead, Nickel, Diesel Other Groundwater (Uses Other Than Drinking Water) Only The Sump Area In The North West Corner Investigated And Cleaned Up. Most Of The Site Is Covered With A Thick Concrete Pad From Wwii Time Frame. * Other Means, Property Sale/Transaction, Site Assessment/Site Investigation Other Means ExCAvate Oily Sump Brunsing Associates 513 19 Francisco Blvd E San Rafael CA Diesel Other Groundwater (Uses Other Than Drinking Water) Tank Closure San Quentin Solid Waste Dist 1615 Francisco Blvd San Rafael CA Exxon 600 Magnolia Ave Larkspur CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Tomales Chevron Walker Creek 3985 Tomales Petaluma Rd Tomales CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Varner Property 516 Irwin St San Rafael CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Subsurface Monitoring Close And Remove Tank Hamilton Army Airfield - Hamilton Army Airfield - New Hamilton Partnership Levee 1 Burma Road Novato CA Exxon 490 Ignacio Blvd Novato CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Mobil 1600 Tiburon Blvd Tiburon CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Loch Lomond Marina 261 Loch Lomond Drive San Rafael CA Dichloroethene (Dce), Tetrachloroethylene (PCE), Vinyl Chloride, Benzene, Ethylbenzene, Gasoline, Other Petroleum, Toluene, Total Petroleum HydroCArbons (Tph), Xylene Soil, Soil Vapor The Subject Property (Site) Is A 29.5-Acre, 11-Dock Recreational Marina. The Western-Most Dock And Jetty Area Houses A Fuel Terminal Which Has Been Previously Investigated; A Corrective Action Plan (CAp) For This Area Was Subjected To Public Comment And Approved By The Rwqcb In April 2008 (Trc, 2008). A Boat Repair Shop Is Located To The West Of The Fuel Loading Dock. To The East Of The Launch Ramp, Several Buildings Containing A Yacht Club, Offices, A Restaurant, And A Yacht Sales Store Are Situated. Another Structure On The Northeastern Portion Of The Site Houses A Supermarket, Offices, Small Shops, And A Dry Cleaner. The Remainder Of The Site Is Comprised Of Boat Storage, Parking Spaces, And VaCAnt Lots. The VaCAnt Lot At The Current Of Loch Lomond Drive And Point San Pedro Road Was A Chevron Service Station Until 1987. This Site, A Former Lust Site, Was Closed By The Rwqcb Following Investigation And Remediation, In 1997. The Planned Redevelopment At Loch Lomond Marina Will Be A Master Planned Community Between Point San Pedro Road To The North And San Rafael Bay To The South, Including New Residential And Commercial Development, As Well As The Current Marina Uses. Environmental Results Detected Analytes Include Acetone, CArbon Disulfide, Tetrachloroethene (PCE), Trichloroethene (TCE), Cis-1,2-Dichloroethene (Cis-Dce), Ethylbenzene, And Xylenes At Concentrations Of Up To 1,700 Micrograms Per Kilogram (Ug/Kg). Residential Esl For PCE Is 430 Ug/Kg. The Acetone Concentration Of 1,700 Ug/Kg Detected In The Sample Collected At A Depth Of 6 Ft Bgs In Boring Dc-7 Exceeded The Residential And Commercial/Industrial Esl For Acetone Of 500 Ug/Kg. Gasoline Was Detected In Five Soil Samples At Concentrations Ranging From 620 To 220,000 Ug/Kg. The Gasoline Concentration Of 220,000 Ug/Kg In A Sample (C16-8-8.5?) Collected At A Depth Of 8 Ft Bgs In Boring C-16 Exceeded The Residential And Commercial/Industrial Esl For This Constituent Of 83,000 Ug/Kg. Hamilton Air Base Novato, Marin Co. Novato CA Golden Gate National Recreational Area - Ggnra Main Marin - Hill 640, Ust I-1 Highway One And Panoramic Highway Stinson Beach CA Diesel Work Performed At Hill 640 Included The Removal Of Ust I-1 And Associated Piping And Site Restoration. Barnett Property 29 Roosevelt Ave Mill Valley CA Heating Oil / Fuel Oil Other Groundwater (Uses Other Than Drinking Water) Subsurface Monitoring Jan Ekels Company 315 Main St Sausalito CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Mcphail-Shamrock Concrete Plant 548 Dubois St. San Rafael CA * Metals, Diesel Other Groundwater (Uses Other Than Drinking Water), Soil 913.49 Tons Petroleum Impacted Soil Removed In March 2003. 3,532 Tons ExCAvated In July 2004. * Other Means Subsurface Investigation Other Means Nike Battery 93, Sf (J09CA094400) - Aoi 8 Radar Tower Ust S-418 290 Smith Ranch Rd San Rafael CA Soil A Usace General Site Map (1970) Documents A 6,000-Gallon Fuel Oil Ust (S-418) Directly Beneath A Radar Tower (S-413; Figure 5-10). During The Site Visit, A Schonstead Magnetic LoCAtor Was Used In An Attempt To LoCAte This Tank. Due To The Abundance Of Rebar And Other Metal Anomalies, Results Of The Magnetic LoCAting Activities Were Inconclusive. No Records Or Closure Documents Were Located Regarding This Ust. Smith & Hawken 35 Corte Madera Ave Mill Valley CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Gambonini Mercury Mine Marshall Petaluma Rd West Marin Co CA Mercury (Elemental) Soil Mercury Mine Site Remediated By Isolating Waste With Vegetated CAp. In Monitoring And Maintenance Phase. Tomales Bay State Park Unknown Star Route 1 Inverness CA Gasoline Under Investigation Other Means CoCA Cola Enterprises West 265 Bel Marin Keys Blvd Novato CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Novato Dod Housing - Novato Housing Bldg. 827-1 Dodhf Novato CA Mccoy Property 20215 State Rt 1 Marshall CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Mill Valley Middle School Unknown CAmino Alto & SyCAmore Mill Valley CA Ignacio Service Station 5778 Redwood Hwy Ignacio CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Felton Motor Co Inc. 60 Hoag Street San Rafael CA Waste Oil / Motor / Hydraulic / LubriCAting Other Groundwater (Uses Other Than Drinking Water) Tank Closure During Tank Removal. Close And Remove Tank Tank Removed. Mclachlin Property 40 Paul Dr San Rafael CA Gasoline Soil Tank Closure Keaton Mortuary 1011 E St San Rafael CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Oil Warehouse 2350 Kerner Blvd San Rafael CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Other Means Pacific Plumbing & Heating 8 Lovell Ave San Rafael CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Marin French Cheese Company 7500 Red Hill Rd Petaluma CA Gasoline Soil Tank Closure Boyce Property 19 Meadow Ave Kentfield CA Heating Oil / Fuel Oil Soil Tank Closure CAltrans Point Reyes Maintenance Yard 10795 Hwy 1 Point Reyes Station CA Diesel Other Groundwater (Uses Other Than Drinking Water) Tank Closure Meadows' Club Golf Course 1001 Bolinas Rd Fairfax CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Tosco - Facility #7381 375 Ignacio Blvd Novato CA Gasoline Soil Tank Closure RCA Global Coast Station 451 Mesa Rd Bolinas CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Hattar Moto Sports 601 E Francisco Blvd San Rafael CA Gasoline, Benzene Under Investigation Tank Closure Close And Remove Tank Indian Valley College 1800 Ignacio Blvd Novato CA Gasoline Aquifer Used For Drinking Water Supply, Other Groundwater (Uses Other Than Drinking Water), Soil Six To Seven USTs Were Removed From 2-3 Areas At The Site. Tank Closure Pacific Bell 23 Mark Dr San Rafael CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Mobil 1400 Novato Blvd S Novato CA Gasoline Other Groundwater (Uses Other Than Drinking Water) The Subject Property(Site) Is A Former Mobil-Branded Automobile Service Station Located On The Northeast Corner South Novato And Rowland Boulevards In Novato, CAlifornia.The Site Is Surrounded By Commercial And Residential Properties.An Active Shell- Branded Service Station Operates On The Southwest Corner The Same Intersection. The Site Is Currently Operated By An Auto Parts Retail Store (O'reilly, Formerly Kragen). Three (3) Gasoline Underground Storage Tanks (USTs) And One (1) Used-Oil Tank Were Removed From The Site In 1986. Multiple Phases Of Environmental Assessment Were Conducted From 1986 Through 1990. Recent Phases Of Assessment Were Conducted Between 2004 And 2012. Results Of Soil And Groundwater Testing Recorded Maximum Concentrations Of Contaminant Compounds Of Petroleum HydroCArbons In The Southern Corner Of The Site. Quarterly Monitoring Was Implemented In 1986. Concentrations Of Total Petroleum HydroCArbons As Gasoline (Tphg) Exceeded Commercial / Industrial Land Use Esls (Environmental Screening Levels) In Shallow Soil Vapor In Several Of The Monitoring Wells. Recommended Investigations On Sub-Slab Soil Vapor Sampling Are Ongoing. Tank Closure Chevron 105 Tiburon Blvd E Mill Valley CA Gasoline Other Groundwater (Uses Other Than Drinking Water) The Site Is Currently An Active Chevron Service Station In A Mixed Commercial And Residential Area Of Mill Valley. Chevron Began Operations At The Subject Site In 1966. A Title Search IndiCAted That The Commercial Property At 100 Tiburon Blvd. (Aka, The Broderick Building), Located Directly Downgradient Of The Subject Site, Was A Service Station For Some Or All Of The Time Between 1957 And 1979. The Original USTs From The Subject Chevron Site Were Replaced In 1982 And The Pump Islands And Product Piping Were Replaced In June 1990. Soil Samples Collected In June 1990 Beneath The North Pump Island Contained Up To 1,300 Ppm Of Tph-G And 33 Ppm Of Benzene. A Sample Of Groundwater (Gw) In The ExCAvation Pit Contained 150,000 Ppb Of Tph-G And 17,000 Ppb Of Benzene. No Data Regarding OverexCAvation Sampling Or Soil Removal Is Available. In August And September Of 1990, Six Borings Were Drilled At The Site With Three Of The Borings Converted To Monitoring Wells (Mws). Soil Samples From The Borings Contained Up To 690 Ppm Of Tph-G And 0.17 Ppm Of Benzene. Initial Gw Samples From The Mws Contained Up To 26,000 Ppb Of Tph-G And 3,100 Ppb Of Benzene. Five Additional Borings Were Installed In April 1995, With Four Of The Borings Converted To Mws Including Two Mws On The Downgradient 100 Tiburon Blvd. Site. In Sept. 1997, One Waste Oil Tank Was Removed Along With Between 15 ? 18 Cubic Yards Of Impacted Soil. The Highest Residual Soil Concentrations Were 750 Ppm Of Total Oil And Grease, 340 Ppm Of Tph-D, 9.2 Ppm Of Tph-G, And 0.095 Ppm Of Benzene. Three Borings Were Drilled In February 2008 Further Downgradient Of The 100 Tiburon Blvd. Site. Soil Samples From The Three Borings Contained Low Or Non- Detectable (Nd) Concentrations Of All Analytes Tested For. Only One Of The Boring Accumulated Enough Gw For Analyzing. This Gw Sample Contained Nd Concentrations Of Tph-G And Btex With 4 Ppb Of Mtbe. The Maximum Current Concentrations From The Most Recent Sampling Of The Mws Were 2,900 Ppb For Tph-G, 2,300 Ppb For Tph-D, Nd For Benzene, And 31 Ppb For Mtbe. The Extent Of HydroCArbons In Groundwater Is Defined To The North By Mw-2, To The East By Mw 3, To The Southeast By Mw 4s, To The West By Mw-6, And To The South In The Down-Gradient Direction By Boring B3. As Described By The January 5, 1996 Rwqcb Memorandum, Regional Board Supplemental Instructions To State Water Board, Interim Guidance On Required Cleanup At Low-Risk Fuel Sites, A Low-Risk Groundwater CAse Has The Following General Characteristics: ? The Leak Has Stopped And Ongoing Sources, Including Free Product, Have Been Removed Or Remediated; ? The Site Has Been Adequately Characterized; ? The Dissolved HydroCArbon Plume Is Not Migrating; ? No Water Wells, Deeper Drinking Water Aquifers, Surface Water Or Other Sensitive Receptors Are Likely To Be Impacted; And ? The Site Presents No SignifiCAnt Risk To Human Health Or The Environment This Site Meets All Of The Above Low-Risk Criteria And Is Discussed In More Detail In The 7/13/09 Site Closure Summary Form. Tank Closure Smith Property 320 Magnolia Ave Larkspur CA Heating Oil / Fuel Oil Soil Site Assessment/Site Investigation Soil Sampling A & A Gas Station 7474 Redwood Blvd Novato CA Diesel, Mtbe / Tba / Other Fuel Oxygenates, Gasoline Well Used For Drinking Water Supply The Site Has Been An Operating Gas Station Since 1967. In 1988, High Concentrations Of Tph-G, Tph-D, & Btex Were First Detected In Soil And Groundwater (Gw). Free Product (Fp) Floating On Top Of The Gw Was Also Encountered Exceeding 0.5 Feet. In Total, Over Sixty Soil Borings Including Fifteen Monitoring Wells (Mws), Two Shallow Test Wells, And Two Extraction Wells Have Been Installed At Or Near The Site. Mtbe Concentrations Were Found To Be Increasing, Reaching Up To 53,000 Ppb In Gw In 2000. Benzene Has Also Been Detected In Gw At Up To 11,000 Ppb. Two Sensitive Receptor Surveys, Conducted In November 1999 And April/May 2000, Identified 15 Properties Within 2000 Feet Of The Site As Having Domestic Water Wells. The Only Known Downgradient Drinking Water Well Was Located About 700 Feet To The Northeast And Serviced 42 Connections At The Redwood Homes Trailer Park (7530 Redwood Boulevard). This Drinking Water Well Was Found To Be Impacted With 92 Ppb Of Mtbe From The Sample Collected On 9/28/00. The Results Were Reported To The County Health Dept. And The Water Board On 10/9/00. This Drinking Water Well Was Taken Out Of Service On 10/10/00, And Drinking Water Was Supplied By Truck To The Trailer Park. The Redwood Homes Trailer Park Was Then Connected To The City Of Novato Water Supply On 10/23/00. This Drinking Water Well Along With An Older, Inactive Water Well At The Trailer Park Were Destroyed On 11/1/00. The Suspected Source Of The Mtbe Contamination Of The Drinking Water Well Was The Via Station. Site Cleanup Requirements Order No. 01-023 Was Issued On 2/21/01, To Help Expedite The Investigation And Remediation Of The Site. Order No. 01-023 Was Rescinded On 10/21/11, BeCAuse The Dischargers Have Completed All Of The Investigative And Remedial Tasks Required By Order No. 01-023. The Site Has Undergone Several Phases Of Interim And Final Remedial Activities. This Included An Interim Remediation Gw Pump And Treat System To Prevent Further Off-Site Migration Of The Gw Plume Before The Final Remediation System Was Installed. The Final Remediation System Consisted Of An Ozone Microsparging System Which Started Up On 3/4/04 And Operated Until February 2009. The Ozone Microsparging System Was Effective In Remediating The Gw With The Concentrations Of ChemiCAls Of Concern (Coc) In The Deeper Gw (From Mws Screened From About Four Or Five Feet Below Grade To More Than 20 Feet Below Grade) Decreasing SignifiCAntly To Non-Detectable (Nd) Concentrations Of Tph-G, Benzene, And Mtbe And 520 Ppb Of Tph-D In The Gw In Oct. 2008. Subsequent Monitoring Has Shown No Evidence Of A SignifiCAnt Rebound. Contaminant Concentrations In Gw Samples From The Shallow Zone (From Mws Screened From One Or Two Feet Below Grade To About 8 Feet Below Grade) Have Decreased Only Slightly After 4.5 Years Of Ozone Microsparging Remediation. Therefore, A 13-Day High Vacuum Dual Phase Extraction (Hvdpe) Remediation Event Was Conducted In August 2009 To Remediate The Shallow Zone Contamination. The 13-Day Hvdpe Event Resulted In A SignifiCAnt Amount Of HydroCArbons Recovered And Treated (About 400 Pounds Of HydroCArbons In The Vapor Phase Or 63 Gallons In The Aqueous Phase).The Post-Hvdpe Remediation Gw Monitoring Event In Oct. 2009 Contain SignifiCAntly Lower Concentrations Of Coc In The Mws Sampled With Only One Of The Wells Still Containing SignifiCAnt Concentrations. In Oct. 2009 Tw-2 Contained 7,500 Ppb Of Tph-G, 1,900 Ppb Of Tph-D, 1,100 Ppb Of Benzene, 290 Ppb Of Tba, And Less Than 10 Ppb Of Mtbe. The Elevated Concentrations In Tw-2 Are LoCAlized Only To The Immediate Vicinity Of Tw-2 . A Closure Letter Was Issued For This Site On 2/10/12 BeCAuse (1) The Contaminant Sources Have Been Evaluated; (2) The Site Has Been Adequately Characterized; (3) Exposure Pathways, Receptors, And Potential Risks, Threats, And Other Environmental Concerns Have Been Adequately Evaluated; (4)Sources Of Onsite Pollution Have Been Remediated To The Extent PractiCAble; (5) The Gwplume Is Stable To Retreating And Limited To The Immediate Site Vicinity; (6) There Are No Unacceptable Risks To Human Health, EcologiCAl Health, And Sensitive Receptors, Considering Current And Reasonable Future Land And Water Uses; (7) Shallow Gw In The Area Is Not Currently Used For Drinking Water, And Water Quality Objectives Should Be Met Before Any Future Beneficial Use Of Shallow Gw Occurs. Tank Closure Golden Gate Transit 1011 Andersen Dr San Rafael CA Diesel Other Groundwater (Uses Other Than Drinking Water) Tank Closure Redwood Oil Company 1320 2nd St San Rafael CA Diesel Other Groundwater (Uses Other Than Drinking Water) Tank Closure Marshall Boat Works 19180 Shoreline Hwy Marshall CA Diesel Soil Other Means Novato Fire Station #1 1000 Grant Ave Novato CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Pacific Bell 360 Geronimo Valley Rd San Geronimo CA Diesel Soil Tank Closure Novato, Seaplanes Tours 240 2 Redwood Hwy Mill Valley CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Private Residence Private Residence San Rafael CA Gasoline Soil Tank Closure Close And Remove Tank Fairfax French Cleaners 173 San Marin Dr Novato CA Tetrachloroethylene (PCE) Other Groundwater (Uses Other Than Drinking Water), Soil, Soil Vapor The Subject Site Is A 70,483 Square Foot One-Story Retail Shopping Center Constructed In 1984. Several Phases Of Investigation Of The Fairfax French Cleaners, One Of The Tenants Of The Shopping Center, Have Been Conducted Since 1996. These Investigations Include The Installation Of Thirteen Groundwater Monitoring Wells At And Immediately Downgradient Of The Site. Soil Samples Taken From The Site Contain Less Than 1 Mg/Kg Of Perchlorethylene (PCE), A Common Dry Cleaning Solvent. Groundwater Samples From The Monitoring Wells Contained Up To 740 Ppb Of PCE And 5.7 Ppb Of TCE In 1997. The Concentrations In The Groundwater Have Decreased To A Maximum Of 150 Ppb Of PCE And Non-Detectable (Nd) Concentrations Of TCE In 2006 And 2007, The Last Four Times That The Groundwater Was Analyzed. Downgradient And Across San Marin Drive Are Residential And Commercial Properties. Three Of The Thirteen Monitoring Wells Are Located Across San Marin Drive. These Three Monitoring Wells Contained A Maximum Of 20 Ppb Of PCE And Nd Concentrations Of TCE In 2006 And 2007. Subslab And Indoor Air Sampling Were Conducted In 2015 And 2016. Site Assessment/Site Investigation Subsurface Investigations Change Operating Procedures Stopped Using PCE At The Site. The Sams Clinic 487 - 489 Miller Avenue Mill Valley CA Diesel, Waste Oil / Motor / Hydraulic / LubriCAting Other Groundwater (Uses Other Than Drinking Water) Site Assessment/Site Investigation Close And Fill Tank In Place Malin Property 203 Murray Ave Kentfield CA Heating Oil / Fuel Oil Soil Other Means Former Oaks Rents 424 Irwin St San Rafael CA Gasoline Aquifer Used For Drinking Water Supply, Other Groundwater (Uses Other Than Drinking Water), Soil Ust Closed In 1963 Replaced With Asts. Asts Closed Mid 1970's, Ust Removed In 1995 With Over ExCAvation. Other Means Tosco - Facility #7384 1125 Lincoln Ave San Rafael CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure San Rafael Chrysler Dodge 1075 Francisco Blvd San Rafael CA Waste Oil / Motor / Hydraulic / LubriCAting Other Groundwater (Uses Other Than Drinking Water) Tank Closure Former CAr Wash & Service Station 990 Francisco Blvd San Rafael CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Hamilton Army Airfield - Hamilton Aaf Outparcel A4- Fuel Line Parcel A-4 Hangar Avenue Novato CA Soil Site Assessment/Site Investigation Shoreline School District Bus Yard 26701 State Rt 1 Tomales CA Gasoline Aquifer Used For Drinking Water Supply Tank Closure Tosco - Facility #4346 501 Sir Francis Drake Blvd Greenbrae CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Former Chevron 204 Flamingo Road Mill Valley CA Diesel, Gasoline Other Groundwater (Uses Other Than Drinking Water) Site Contained A Gasoline Station From 1950 Until December 2006. On 12/15/06, Four USTs. One Hydraulic Hoist, One Waste Oil Tank (Wot), And All Dispensers And Associated Piping Were Removed When The Station Was Demolished. One Other Hydraulic Hoist Was Previously Removed. The Site Is Currently A VaCAnt Lot. Ten Soil Confirmation Samples Were Collected On 12/15/06 Along With One Grab Groundwater (Gw) Sample From The Main Ust Pit And One Gw Sample From The Wot Pit. The Grab Gw Samples Contained Up To 4,900 Ppb Of Tph-G, 44,000 Ppb Of Tph-D, 3,600 Ppb Of Tog, And 240 Ppb Of Benzene. On 12/20/06, Additional Soil Was ExCAvated From The Wot Pit And Two Additional Soil Confirmation Samples Were Taken. In Addition, 57,280 Gallons Of Gw Was Extracted, Treated, And Discharged To The Sanitary Sewers From Dec. 18 ? 22, 2006. Final Grab Gw Samples Were Collected From Each Pit On 12/20/09. The Final Grab Gw Samples Contained Maximum Concentrations Of 5,000 Ppb Of Tph-G, 1,400 Ppb Of Tph-D, 3,600 Ppb Of Pog, 240 Ppb Of Benzene, And 6 Ppb Of Mtbe. A Sensitive Receptor Survey In 2007 Identified The Nearest Water Well As Being 1,800 Feet From The Site And The Nearest Surface Water Body As Being 700 Feet Sw Of The Site. Eight Soil Borings Were Advanced In October And November 2007. One Soil Sample (Sb7) From The Hydraulic Hoist Area Detected Tph-D At 540 Mg/Kg, Tph-Ho At 1,300 Mg/Kg, And Tog At 1,000 Mg/Kg. All Of The Other Soil Samples Contained Low Or Non-Detectable (Nd) Concentrations Of ChemiCAls Of Concern (Cocs), Although None Of The Soil Samples From The Other Seven Borings Were Analyzed For Tph-Ho. Grab Groundwater Samples From The Borings Contained Up To 510 Ppb Of Tph-D, 3,100 Ppb Of Tog, 16,400 Ppm Of Tds, And Low Or Nd Concentrations Of The Other Cocs, Although None Of The Groundwater Samples Were Analyzed For Tph-Ho. The High Concentrations Of Tds IndiCAte That The Groundwater Beneath This Site Is Not A Potential Source Of Drinking Water. On 10/8/08, Three Additional Borings Were Advanced Near The Former Hydraulic Hoists Using Air-Knife Or Hand-Auger Equipment. Boreholes Were Allowed To Stay Open For A Couple Of Hours But No Gw Was Encountered. Soil Samples From The Three Borings Contained Fairly Low Concentrations Of Pollutants (Maximum Of 495 Mg/Kg Of Tog, 66 Mg/Kg Of Tph-Ho, And 41 Mg/Kg Of Tph-D. This Site Meets The Criteria Outlined In The January 5, 1996 Rwqcb Memorandum, Regional Board Supplemental Instructions To State Water Board, Interim Guidance On Required Cleanup At Low-Risk Fuel Sites. Based On Data From The Investigations To Date, The Maximum Tog, Tph-Ho, And Tph-D Concentrations Detected Are 1,000 Mg/Kg, 1,300 Mg/Kg, And 540 Mg/Kg, Respectively, In Sb7 At 5 Fbg, Which Is The Only Soil Sample To Exceed Any AppliCAble Esls. Recent Soil Data From Borings Sb9, Sb10 And Sb11 Demonstrate That Petroleum HydroCArbons Detected In Soil From Sb7 Are Limited In Extent. While There Are Limited Data Regarding Tph-Ho At The Site, Tph-Ho Are Relatively Immobile, Does Not Dissolve Readily In Water, Are Not Very Volatile, And Have Little Toxicity. Also, The High Concentrations Of Tds In The Shallow Groundwater IndiCAte That The Groundwater Beneath This Site Is Too Saline To Be A Potential Source Of Drinking Water. Therefore, The Residual Concentrations In The Soil And Groundwater Apparently Do Not Represent A Current Or Future Public Health, EcologiCAl, And Water Resources Threat. Tank Closure Close And Remove Tank Corte Madera Town Cenetr 770 Tamalpais Dr Corte Madera CA Waste Oil / Motor / Hydraulic / LubriCAting Other Groundwater (Uses Other Than Drinking Water) Tank Closure Shell 2901 Bridgeway Blvd Sausalito CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure 1589 Marshall Beach Rd. 1589 Marshall Beach Rd. Inverness CA Exxon Murray Trust 1221 3rd St San Rafael CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Greyhound Line Inc 701 3rd St San Rafael CA Gasoline Soil Tank Closure Novato Bus Facility 801 Golden Gate Pl Novato CA Diesel Other Groundwater (Uses Other Than Drinking Water) The Subject Property (Site) Is Composed Of Two Combined Large Commercial/Industrial Parcels (Totaling Approx. 6.5 Acres) Located At The End Of The Road, 801 Golden Gate Place In Novato, CAlifornia. The Site Has Been Utilized As The Novato Bus Facility (Nbf) By The Golden Gate Bridge, Highway, And Transportation District (District) Since 1975, For The Purposes Of Bus And Vehicle Storage (50+ Buses), And Vehicle Refueling. Underground Storage Tanks (USTs) For Diesel Fuel Have Been Used On Site Since 1975. In 1977, Diesel USTs Were Found Leaking. Site Monitoring Began In 1993 And 1995. In 1998, Two (2) Single-Wall Fiberglass 12,000-Gal Diesel USTs Were Removed And Replaced With Two (2) New 15,000-Gal Double-Walled Fiberglass USTs. In 1999 And 2000 Water Surface Samples Were Analyzed For Total Petroleum HydroCArbons As Diesel (Tphd), Benzene, Toulene, Ethylene, And Xylenes (Btex) Compounds, And Methyl Tert Butyl Ether (Mtbe). Tphd And Btex Reported Non-Detectable Concentrations, Mtbe Very Low Amounts. Free Product (Diesel) Was Discovered In 2000, Precipitating The Installation Of Oil-Absorbent Sock Around Two Monitoring Wells (Mw-1,-3). In 2004, Recommendations Were Made To Address The Increased Concentrations Of Tphd In Site Groundwater. In 2005, And In 2006 The Cleanup Contract Work Was Awarded To The Consultant Group Pes Environmental, Inc. Tank Tightness Test UnoCAl #4024 Hwy 140 & 10th St Mariposa CA Hamilton Army Airfield - Hamilton Aaf Hospital Hill Outparcel West Hospital Drive Novato CA Marin Honda 5860 Paradise Dr Corte Madera CA Waste Oil / Motor / Hydraulic / LubriCAting Other Groundwater (Uses Other Than Drinking Water) Tank Closure Albert's Transmission Service 1249 Francisco Blvd E San Rafael CA Waste Oil / Motor / Hydraulic / LubriCAting Other Groundwater (Uses Other Than Drinking Water) Tank Closure United Moving Inc 1023 Magnolia Ave Larkspur CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Cloudburst CAr Wash 6981 Redwood Blvd Novato CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure LuCAsfilm Limited LuCAs Valley Rd San Rafael CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Cunninghame Estate 30201 State Rt 1 Valley Ford CA Gasoline Soil Tank Closure Former Mobil Station 700 Irwin St San Rafael CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Goodyear Dealer Expansion 496 Las Gallinas Avenue San Rafael CA Total Petroleum HydroCArbons (Tph) Due Diligence Investigation Redwood Gas/Fara's Auto 98 Sir Francis Drake Blvd San Anselmo CA Gasoline Soil Tank Closure College Of Marin Kentfield CAmpus 835 College Avenue Kentfield CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Novato Dod Housing - Novato Former Ust Site 970 - USTs 970-1, 970-2, 970-3 970 C Street Novato CA Benzene, Toluene, Xylene, Mtbe / Tba / Other Fuel Oxygenates, Gasoline Aquifer Used For Drinking Water Supply, Other Groundwater (Uses Other Than Drinking Water), Soil, Surface Water Former Ust Site 957/970 At Dodhf Novato Comprises An Approximate 13 Acre Area. The Site Is The LoCAtion Of Former USTs Which Served A Former Naval Exchange (Nex) Service Station And Former Naval Public Works Center (Pwc) Gas Station. The Nex Gas Station Was In Operation Fro The Mid-1970s Through The Early 1990s, At Which Point The Three Associated USTs (970-1 Through -3) Were Removed. Ust 957 Was Located At The Pwc Gas Station And Was Removed In 1992. These Ust Sites Have Been Combined BeCAuse The Mtbe Groundwater Plumes Underlying These Areas Have Merged And Are No Longer Distinguishable. Thompson Dev. Inc., Acquired The Property From The Us Navy And Accepted Responsibility To Finalize Remeditation. Ust Leak Ust ExCAvation Mechanics Automotive CAre 296 N. San Pedro Rd. San Rafael CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Mill Valley Imports 900 Redwood Hwy Mill Valley CA Waste Oil / Motor / Hydraulic / LubriCAting Soil Tank Closure East Fort Baker - Bldg 637 637 Breitung Rd Sausalito CA Corte Madera Corporation Yard 81 Lucky Dr Corte Madera CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Novato Unified School District 15 San Marin Dr Novato CA Waste Oil / Motor / Hydraulic / LubriCAting Aquifer Used For Drinking Water Supply, Other Groundwater (Uses Other Than Drinking Water), Soil R2 Staff Is Attempting The Get This Site Claimed By The Responsible Party. Tank Closure Marin County Civic Center 3501 Civic Center Dr San Rafael CA Diesel Soil Other Means UnoCAl 101 Marinwood Ave San Rafael CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Wilson Property 16 Old Landing Rd Tiburon CA Heating Oil / Fuel Oil Under Investigation Tank Closure Rab Motors 540 Francisco Blvd San Rafael CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Subsurface Monitoring Close And Remove Tank Novato Dod Housing - Hamilton Square Townhomes - Thompson Development 970 C Street Novato CA Polychlorinated Biphenyls (Pcbs), Arsenic, Lead, Diesel, Gasoline, Mtbe / Tba / Other Fuel Oxygenates, Waste Oil / Motor / Hydraulic / LubriCAting Soil, Soil Vapor, Under Investigation Pg & E 8161 Old Redwood Hwy Novato CA Waste Oil / Motor / Hydraulic / LubriCAting Soil Tank Closure CAltrans Maint Facility San Rafael Unknown Main St San Rafael CA Diesel Other Groundwater (Uses Other Than Drinking Water) Tank Closure Bridge Housing Corp Unknown 3rd St & C St San Rafael CA Gasoline Soil Tank Closure Norge Laundry/Holiday Cleaners 936-938 Diablo Ave Novato CA Other Groundwater (Uses Other Than Drinking Water), Soil, Soil Vapor Background The Novato Fair Shopping Center Is Located In A Primarily Commercial Area In South Central Novato, CAlifornia. The Site Occupies Approximately 11.3 Acres And Is Currently Used For Mixed Commercial Purposes (The ?Property?). The Shopping Center Consists Of 20 Tenant Spaces. One Of The Tenant Spaces, Located At 936 Diablo Avenue, Was Formerly Operated As A Dry Cleaning Facility By Norge Cleaners (The ?Site?). These Operations Resulted In Releases Of The Dry Cleaning Solvent Tetrachloroethene (PCE) To Soil And Groundwater. Remedial Activities Voluntarily Implemented At The Site Included ExCAvation Of 44 Cubic Yards Of Impacted Soils, Extraction Of Impacted Soil Vapor For 10,746 Hours, And Post Remediation In-Situ Treatment Of Residual Contaminants Using Potassium Permanganate. Soil ExCAvation Was Completed In All Accessible Areas Within The Former Tenant Space. The LoCAlized Areas Of Impacted Soil That Could Not Be Removed Due To Structural Considerations Were Treated Through The Installation And Operation Of A Soil Vapor Extraction System. This System Was Operated Until Monitoring Confirmed That The Extracted Soil Vapor Had Reached Asymptotic Levels. The Low Levels Of Vocs Remaining In Site Soil And Groundwater Were Further Treated Using Potassium Permanganate. All Of The Voluntary Remedial Activities Implemented At The Site Were Conducted With The Approval And Oversight Of The Novato, Bay Regional Water Quality Control Board (Rwqcb). Existing Site Conditions The Site Has Undergone Extensive Investigation And Remedial Activities From 1991 To 2003. AnalytiCAl Results For The Site IndiCAte That Remedial Activities Have Effectively Removed The Chlorinated Solvents In Soil, Soil Vapor, And Groundwater At The Site To Levels That Do Not SignifiCAntly Adversely Affect Human Health Or The Environment And Are Acceptable And Consistent With The Current And Planned Commercial And Retail Use Of The Property. The Most Recent Data Collected At The Site (July 2003) IndiCAte That Average Soil Vapor Concentration Beneath The Former Dry Cleaning Space Slab Is Below Commercial/Industrial Environmental Screening Levels (Esls) Established By The Rwqcb. All Soil Samples, With The Exception Of One Soil Sample (49 Mg/Kg Of PCE) Beneath The Former Dry Cleaner, Are Below Commercial/Industrial And Residential Esls. The Soil Sample That Exceeds Commercial/Industrial Esl Is Located At Approximately 2 To 4 Feet Below Ground Surface (Bgs) Beneath The Building Slab. Based On Deeper Soil Samples From This Boring LoCAtion And Additional Borings Taken In The Vicinity Of The Sample, The VertiCAl And Horizontal Extent Of The Residual Contamination Is Limited To Less Than 6 Feet Bgs And Is Confined To An Area Approximately 10 Feet In Diameter. In Addition, Potassium Permanganate Was Added To This Area Subsequent To The Confirmatory Sampling To Further Reduce Residual Concentrations. Groundwater Samples Collected From Beneath The Slab And Down-Gradient Of The Tenant Building Are Within 10 Times The Maximum Contaminant Level (Mcl) Established For The Protection Of Drinking Water. The Maximum Concentration Of PCE And TCE Detected In Groundwater Following Remedial Actions Is 13 Micrograms Per Liter (Ug/L) And 27 Ug/L, Respectively. Property Use Restrictions Due To The Limited Residual Levels Of Volatile Organic Compounds (Vocs) In Soil Underneath The Building And Residual Levels Of Vocs In Groundwater In Excess Of The Mcls, The Rwqcb Required That The Residual Risks Associated With The Presence Of The Vocs Be Managed Using Institutional Controls. Therefore, A Land Use Covenant Restricting The Property To Commercial / Industrial / Office Use Has Been Recorded For The Property. Other Restrictions Outlined In The Covenant Include A Soil Management Plan For Any Future ExCAvation Activities, As Well As Prohibiting Groundwater Extraction. * Rpr Hamilton Fields Sports Complex Hamilton Landfill 26 Novato CA The Project Site Is On Landfill 26 At Hamilton Base. The Regional Water Board Issued Updated Waste Discharge Requirements (Order, Attached) To The United States Department Of Defense, Department Of The Army, For Landfill 26. The Order Has Specific Requirements Related To Protecting The Integrity Of The Landfill CAp And Water Quality As Well As Monitoring And Implementing Corrective Action. Nike Battery 93, Sf (J09CA094400) - Aoi 9 S-213 Enlisted Men?S Barracks 290 Smith Ranch Rd. San Rafael CA Soil Aoi 9: Enlisted Men?S Barracks Ast?One 1,500-Gallon Diesel Ast (S-213) Was Located On The Northeast Corner Of The Enlisted Barracks (S-201). During The Site Visit, The Tank Was Noted To Have Been Removed And No Stressed Vegetation Or Staining Was Observed. No Beneficial Use Or Removal Documentation Was Located Regarding This Ast. Murray Property 116 Winding Wy Ross CA Heating Oil / Fuel Oil Soil Tank Closure Los Gallinas Sanitary District 300 Smith Ranch Rd San Rafael CA Under Investigation Shell 295 Sir Francis Drake Blvd Larkspur CA Waste Oil / Motor / Hydraulic / LubriCAting Other Groundwater (Uses Other Than Drinking Water) Tank Closure San Geronimo Golf Course 5800 Sir Francis Drake Blvd San Geronimo CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Former Mobil 981 Francisco Blvd San Rafael CA Waste Oil / Motor / Hydraulic / LubriCAting Other Groundwater (Uses Other Than Drinking Water) Tank Closure Gte Diablo 911 Diablo Ave Novato CA * Rpr Art's Auto CAre 1005 Northgate Dr San Rafael CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Duffy Brothers Garage 855 C St San Rafael CA Gasoline Soil Tank Closure East Fort Baker - Bldg 505-2/3 505 Mcreynolds Rd. Sausalito CA Kaiser MediCAl Center 99 Montecillo Rd San Rafael CA Diesel Other Groundwater (Uses Other Than Drinking Water) Subsurface Monitoring Shell 516 Tamalpais Dr Corte Madera CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Inventory Control Chevron 7417 Redwood Hwy Novato CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure 7 Eleven 80 Medway Rd San Rafael CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Soil Borings On This Adjacent Site (80 Medway) Due To To Ust Leak At 86 Medway. Repair Product Piping Repaired Swing Joint Under Dispenser On Adjacent Ust Site. Seven To Seven Cleaners 1432 South Novato Boulevard Novato CA Other Groundwater (Uses Other Than Drinking Water), Soil, Soil Vapor, Surface Water The Site Is Now Occupied By The Armstrong Garden Center, And Was Formerly A Strip Mall Which Contained The (Former) 7 To 7 Cleaners (A Dry Cleaner Facility Which Used And Disposed Of PCE Onsite). The Release(S) Of PCE Occurred Due To Improper Waste Disposal Practices Performed By Former Dry Cleaner Operator. Site Investigation Activities Began In 1991 And Continued Through To 2001. The Site Investigations Defined The Extent Of PCE Solvent (And Its Degradation Products [TCE, Dce, And Vc]) In Both Soil And Groundwater. The Highest Levels Of Soil Contamination Were Found Directly Beneath The Dry Cleaner And In The Immediate Area Between The Dry Cleaner And A Nearby Creek. Groundwater Contamination Consists Mostly Of The PCE Degradation Compounds (TCE, Dce And Vc) And Is Found Mostly North And Northeast Of The Facility In The General Direction Of Groundwater Flow. Seven Groundwater Monitoring Wells Are Sampled To Determine The Fate And Transport Of Chlorinated Solvents In Groundwater. Initial Cleanup Effort Began In 1996 With The Removal Of Approximately 600 Cubic Yards Of Impacted Soil From Directly Around The Former Facility To Area Adjacent To The Creek. In 2002, A Dual Phase Soil Vapor And Groundwater Extraction (Dpe) System Was Installed And Operated. Also, The Strip Mall Was Demolished And Site Redevelopment Undertaken. During Building Demolition, Impacted Soil Was ExCAvated And Removed From The Site. The Dpe System Was Operated For About 6-Months And Removed Approximately 750 Pounds Of Solvents, And It Is Estimated That 450 Pounds Of Solvents Were Removed By Soil ExCAvation. In Total, Approximately 1,200 Pounds Of PCE And Related Compounds Have Been Removed From The Site. Upon Completion Of Site Redevelopment, An Enhanced Bioremediation Program Was Implemented. By Supplying Nutrients To Naturally Occurring Bacteria, The PCE Is Dechlorinated In A Sequential Manner To TCE, Dce, Vc And Finally Inert End Compounds Ethane Or CArbon Dioxide. Residual Concentrations Of Solvents In Groundwater Have SignifiCAntly Declined. Solvent Concentrations Are Currently Over The AppliCAble Esls For Mw-1r, Mw-2r, And Mw-7. Additional Soil Vapor Sampling And Remediation Are Planned. Groundwater At The Site Is Currently Monitored On A Semi-Annual Schedule. Groundwater Monitoring Is Performed To Assess The Effectiveness Of The Bioremediation Program And Will Continue Until Site Condition Meet Low Threat Closure Criteria. Facility Inspection, Site Assessment/Site Investigation, Subsurface Monitoring, Visual Change Operating Procedures Western Boat House 101 3rd St San Rafael CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Tamalpais High School 325 Doherty Dr Larkspur CA Diesel Other Groundwater (Uses Other Than Drinking Water) The Site Is An Active Corporation Yard For The Tamalpais Union High School District. The Site Will Continue To Be Used As A Corporation Yard For The Tamalpais Union High School District For The Foreseeable Future. Between 1987 And 2002, Three Groundwater Monitoring Wells (Mws) Were Installed On-Site (I.E., Mw1 Through Mw3). Groundwater Monitoring Was Performed Three Times In The Year 2003. On The Basis Of Low Concentrations Of Petroleum HydroCArbons In Groundwater, Closure Was Requested In The December 19, 2003 Quarterly Monitoring And Sampling Report, Monitoring Was Ceased, And The Three Mws Were Destroyed Under Permit In 2013. Prior To 2001 One Waste Oil Underground Storage Tank (Ust) And One Gasoline Ust Were Removed From Different Pits At The Subject Site. The Regional Water Quality Control Board (Rqwcb) Requested That Groundwater Samples Be Collected In The Vicinity Of The USTs To Evaluate The Presence Of Mtbe And Other Petroleum HydroCArbons. Monitoring Well, Mw1 Was Installed Around 1987. 2001 Subsurface Investigation And 2003 Monitoring Well Installation In September 2001, Soil Borings B1 Through B3 Were Advanced To Evaluate The Extent Of Contamination From The USTs. A Groundwater Grab Sample Was Collected From Each Of The Soil Borings. Discoloration Was Observed In All Three Boreholes And Odors Were Reported In Two Of The Boreholes (B1 And B2) At Depths Approximately Coincident With The Water Table. On December 17, 2002, Mw2 And Mw3, Were Installed In The Vicinity Of The Former Gasoline Ust Pit At The Subject Site. No Free Product, Sheen Or Petroleum HydroCArbon Odor Were Observed During Well Development Activities Or Wells Sample Collection In January 2003. The Results Of The Groundwater Samples Collected From Mw1, Mw2 And Mw3 Show That Tph-G, Btex, Mtbe, Tph-D And Trph Were Not Detected In Any Of The Wells. The Groundwater Flow Direction Was To The Northwest. 2003 Monitoring Well Investigations On April 10, 2003, July 9, 2003, And October 27, 2003, Mw1, Mw2 And Mw3 Were Sampled. The AnalytiCAl Results For All Of The Groundwater Samples Showed That None Of The Analytes (Tph-G, Tph-D, Btex, Mtbe And Trph) Were Detected In Any Of The Wells. Based On The Absence Of Detected Analytes (Tph-G, Tph-D, Btex, Mtbe And Trph) In Monitoring Wells, Mses Recommended That Quarterly Monitoring And Sampling Program Be Discontinued And The CAse Be Closed. 2013 Monitoring Well Destruction The Mws Were Over-Drilled On December 19, 2013 In Accordance With County Of Marin Environmental Health Services Permit Requirements. 2014 Ust Removal Report ExCAvation And Removal Of One Previously Unknown Ust Occurred On February 18, 2014. Four Soil Confirmation Samples Were Analyzed And Contained Low Or Non-Detectable (Nd) Concentrations Of Tph-G, Tph-D, Tph-Mo, Btex, And Lead. Based On The Absence Of Soil Staining Or Discoloration, And Odor And Low Or Nd Concentrations Of Petroleum HydroCArbons In Soil, No Evidence Of SignifiCAnt Impacts To Soil Had Occurred In The Ust Pit. However, There Was The Presence Of A Sheen On The Water In The Ust Pit. After Purging The Pit Of 2,600 Gallons Of Groundwater Which Were Disposed Of Offsite, A Grab Groundwater Sample From The Pit Contained Low Or Nd Concentrations Of Tph-G, Tph-D, Tph-Mo, Btex, And Lead. Residual Groundwater Concentrations Table B Shows The HistoriCAl Maximum And The Current Groundwater Concentrations (2014) Of The Primary Cocs Detected In Monitoring Wells And Compares Them To The AppliCAble Esls. Table B Maximum And Current HydroCArbon Concentrations In Groundwater Analyte Max. HistoriCAl Concentration (G/L) Max. Current Concentration (G/L) Drinking Water Esl (G/L) Tph-G 2100 56 100 Tph-D 1300 110 100 Benzene 14 Nd 1.0 Toluene 0.94 Nd 40 Ethylbenzene 51 Nd 30 Xylenes 140 Nd 20 The Maximum Concentrations In Groundwater Had Decreased From 2001 To Non-Detect In 2003 Which IndiCAtes That The Groundwater Plume Naturally Attenuated, Primarily On-Site, Was Defined, Stable And Degrading, And Therefore Had Likely Reached Its Maximum Extent. However In 2014, A Third Ust Was Found At The Site And Soil And Groundwater Samples Were Analyzed. The Table Shows The Maximum Current Concentrations From The 2014 Ust Removal Event. Tph-D Concentration Exceeds The Drinking Water Esl Concentration. No Lnapl (Light Non- Aqueous Phase Liquid) Has Ever Been Detected On-Site. Low-Threat Closure Criteria The Site Meets The Criteria For Low Threat Closure In The State?S Low Threat Closure Policy Based On The Following: ? The Site Is Located Within The Service Area Of Marin Municipal Water District. ? The Site?S Unauthorized Release Has Been Characterized As A Release Of Only Petroleum Based Products. ? The ?Primary? Release Date Is Estimated Prior To 2001 And The Site?S Primary Release Has Been Stopped. ? No Lnapl Has Been Observed In Any Of The Wells Since Groundwater Monitoring Began In 2003. ? Environmental Reports For The Site Contain The Elements Of A Conceptual Site Model That Assesses The Nature, Extent, And Mobility Of The Release. ? Remedial ExCAvation Of 35.79 Tons Of Soil Was Performed In The Area Of The 1000 Gallon Gasoline Ust In 2014 Along With Purging The Pit Of 2,600 Gallons Of Groundwater. Remaining HydroCArbon Concentrations In Soil And Groundwater Are Low Or Nd And Are Expected To Continue To Degrade. Therefore, Secondary Source Mass Is Considered To Have Been Removed To The Extent PractiCAble. ? Mtbe Has Been Tested For And The Results Reported. ? Conditions Satisfying The Definition Of A Nuisance As Defined In Water Code Section 13050 Do Not Exist At The Site. ? Groundwater - The Site Satisfies Class 1 Of The Groundwater Specific Criteria. The Petroleum HydroCArbon Plume Has A Predicted Maximum Length Of Less Than Approximately 100 Feet, No Lnapl Has Been Reported At The Site, And There Are No Water Supply Wells Within 250 Feet Of The Site. ? Vapor Intrusion To Indoor Air ? The Site Satisfies Scenario3a Of The Vapor Intrusion Specific Criteria. Benzene Concentration In Groundwater Is Less Than 100 Ug/L (Benzene Has Been Below Detection Limits Since 2003) And The Total Tph (Tph-G And Tph-D Combined) Is Less Than 100 Mg/Kg Within The Top Five Feet Of Soil. ? Direct Contact And Outdoor Air Exposure - No Benzene And Ethylbenzene Soil Concentrations Exceed The Direct Contact And Outdoor Air Exposure Criteria For Residential And Commercial/Industrial Uses. Tank Closure German Auto Repair Former 332 Miller Ave Mill Valley CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Nichelini Property 76 San Pablo Rd San Rafael CA Gasoline Soil Tank Closure Texaco 1524 2nd St San Rafael CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Gte Novato Plant Yard 501 Davidson St Novato CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Arco #6157 1401 2nd St San Rafael CA Benzene, Gasoline, Total Petroleum HydroCArbons (Tph) Other Groundwater (Uses Other Than Drinking Water) Tried Oxygen Injection Pilot Study - It Did Not Appear To Work. Tried Some Sulfate Injection, Did Limited ExCAvation. The Site Is An Active Arco Gasoline Retail Outlet Located On The Southwestern Corner Of Second Street And D Street In San Rafael, CAlifornia (Marin County Assessor?S Parcel Numbers 012-071-11, 012-071 -12, And 012-071-14). The Site Is Developed With A Convenience Store, Three Dispenser Islands, An Underground Storage Tank (Ust) CAvity Comprised Of Three USTs, And A Waste Oil Tank. Except For Small LandsCAped Planters Located On The Perimeter Of The Property, The Site Is Paved With Asphalt And Concrete. The Existing Dispensers Are Located On The North And Eastern Sides Of The Store And The USTs Are Located On The Northeastern Portion Of The Site. Two Service Bays Are Located On The Western Portion Of The Site. In 1989, Three USTs, A Waste Oil Tank, And Associated Piping Were Removed From The West Side Of The Site And The Three Current USTs And Waste Oil Tank Were Installed. (Corrective Action Plan, 11-1-2013) Tank Closure Close And Replace Tank UnoCAl Station #3505 700 Tamalpais Drive Corte Madera CA Diesel, Gasoline Other Groundwater (Uses Other Than Drinking Water) The Site Is An Operating 76-Branded Service Station Located In A Mixed Commercial And Residential Area Of Corte Madera, CAlifornia. Current Station Facilities Include Two Gasoline Underground Storage Tanks (USTs), Two Fuel Dispenser Islands, A Station Building, And An Attached Service Garage. In October 2007, Atc Conducted A Due Diligence Investigation At The Site Advancing Four Borings. Grab Groundwater (Gw) Samples Were Collected From Each Boring (Maximum Concentrations Detected Included 480 Ppb Of Tph-G, 3,900 Ppb Of Tph-D, 94 Ppb Of Mtbe, 590 Ppb Of Tba, And Below Detectable Levels Of Benzene). No Soil Samples Were Collected During This Investigation. In A Letter Dated 4/29/08, The Water Board Required A Workplan For Defining The Extent Of The Soil And Gw Pollution And The Results Of A Sensitive Receptor Survey (Srs). In April Through June 2008 ? Delta Consultants Conducted A Srs. Department Of Water Resources (Dwr) Well Log Records Were Reviewed. A Total Of 3 Wells Had Verifiable Addresses Within A 2,000 Foot Radius Of The Site. The Nearest Well Is 1,000 Feet To The Northwest With A Total Depth Of 61 Feet And An Unknown Screen Interval. This Well Is Reportedly Used For Irrigation. The Other Two Reported Wells Were An Irrigation Well And A Monitoring Well Located 1,125 Feet And 1,675 Feet Southeast Of The Site, Respectively. Domestic Water In The Vicinity Of The Site Is Supplied By The Marin Municipal Water District (Mmwd) Using Reservoirs And The Russian River And No Municipal Water Wells Are Used. No Wells From The Dwr Well Log Search Were Reported As Domestic. On June 19, 2008 A Field Sensitive Receptor Survey Was Conducted To Confirm The Presence Of Any Additional Potential Receptors Within 250 Feet Of The Site. Four Utility Vaults Were Identified During This Survey, The Closest Of Which Is Located At The Southwestern Corner Of The Site. The Construction Of These Vaults Is Unknown As The Covers Were Not Opened. In Addition, A Public Library Is Located Approximately 350 Feet South Of The Site. A Church And Children?S Center Were Identified 450 Feet Southwest Of The Site. Delta Then Installed Three Monitoring Wells At The Site In November 2008. Soils Samples Were Collected From Each Of The Borings During This Investigation. The Monitoring Wells Were Constructed To Depths Of Ten Feet Bgs. Gw Samples From Four Rounds Of Mw Sampling Contained Low Or Non-Detectable Concentrations Of Pollutants (Maximum Of 190 Ppb Of Tph-G, 210 Ppb Of Tph-D, 13 Ppb Of Mtbe, 190 Ppb Of Tba, And Below Detectable Concentrations Of Benzene. Based On The Following, CAse Closure For This Site Is Considered To Be Appropriate: (1) The Site Has Been Adequately Investigated; (2) No SignifiCAnt Sources Of Petroleum Pollution Has Been Discovered In The Recent Investigations; (3) The Groundwater Plume Is Stable; (4) The Non-Detect Or Low Concentrations Of Petroleum Related HydroCArbons In Soil And Groundwater Are Below Esl?S For Groundwater That Is Not A Current Or Potential Drinking Water Resource; (5) Due To High Tds, There Is Little To No Likelihood That The Shallow Groundwater Will Be Used As A Drinking Water Supply In The Near Future; And (6) The Residual Concentrations In The Soil And Groundwater Apparently Do Not Represent A Current Or Future Public Health, EcologiCAl, And Water Resources Threat. Site Assessment/Site Investigation Former Chevron Station 729 4th St San Rafael CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Alto Station Apartments 290 CAmino Alto Ct Mill Valley CA Gasoline Soil Tank Closure Marin Boat House 115 Third Street San Rafael CA * Gov Stuart Property 4 Winship St Ross CA Heating Oil / Fuel Oil Soil Tank Closure Nike Battery 93, Sf (J09CA094400) - Aoi 7 S-219 Ust Administrative Area 290 Smith Ranch Rd San Rafael CA Diesel Soil According To A General Site Map Of The Usace Air Defense Missile Site Sf-93 (1970), A 550- Gallon Diesel Ust (S-219) And Associated Appurtenances (Figure 5-9) Were Formerly Located On The West Side Of The Former Mess Building (S-204). The Following Information Was Provided In A ?Site Closure Report? Prepared By Cky, Inc. In October 1996 For The Usace. The Ust And Associated Appurtenances Were Removed On 5 January 1996 By Cky, Inc. At The Time Of Removal, The Tank Was Almost Full Of Diesel Fuel. The Piping And Tank Were Flushed With Water From A High-Pressure Washer And Transported Off-Site For Disposal. A Quarter-Inch Diameter Hole Was Observed On The Tank. Stained Soil With A Petroleum HydroCArbon Odor Was Found At The Walls And The Bottom Of The ExCAvation Pit. ExCAvated Soil Was Placed On Visqueen Plastic Sheeting And Covered With Visqueen Until It Was Hauled Off-Site On 22 June 1996. At The Time Of Removal, Two Confirmatory Soil Samples And One Groundwater Sample Were Collected From The Bottom Of The Ust ExCAvation Pit. These Samples Were Analyzed For Tph-D Using Modified Epa Method 8015 And For Btex Using Epa Method 8020. Analysis Of The Soil Samples (Appendix F) IndiCAted Concentrations Between 22,000 And 17,000 Ppm For Tph-D, Non-Detect For Benzene, 330 And 310 Ppb For Toluene, 390 And 350 Ppb For Ethylbenzene, And 1,100 And 1,030 Ppb For Total Xylenes. Groundwater Was Encountered At 5 To 6 Feet Bgs In The ExCAvation Pit At The Time Of Tank Removal. The Groundwater Was Sampled And AnalytiCAl Results Showed Concentrations Of 39,000 Ppb Tph-D, Non-Detect For Benzene, 26.2 Ppb For Toluene, 22.0 Ppb For Ethylbenzene, And No Total Xylenes. Groundwater In The ExCAvation Was Evacuated With A Vacuum Truck On 24 June 1996. After Groundwater Removal, Approximately 2 Cubic Yards Of Mud Were Removed And Added To The Existing Soil Stockpiles For Later Off-Site Disposal. The ExCAvation Was Backfilled With Approximately 2 Feet Of Imported Clean Pea Gravel At The Base, Lined With Visqueen, Filled To 6 Inches Below Grade With Imported Soil, And Covered With Topsoil From The Nearby Area To Match The Existing Grade. Site Assessment/Site Investigation, Tank Closure Close And Remove Tank, Remove Contents Verkozen Property 27000 Hwy 1 Tomales CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Tiburon Marine Fishery Service 3150 Paradise Dr Tiburon CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure East Fort Baker - Bldg 694/749 694/749 Breitung Rd. Sausalito CA Sonnen Lexus 740 Francisco Blvd San Rafael CA Stoddard Solvent / Mineral Spriits / Distillates Other Groundwater (Uses Other Than Drinking Water) Tank Closure Ongaro Plumbing 243 San Anselmo Ave San Anselmo CA Gasoline Soil Tank Closure De Maestri Distributing Company 3195 Kerner Blvd San Rafael CA Waste Oil / Motor / Hydraulic / LubriCAting Soil Tank Closure Hamilton Aaf (Incl. Lf#26) - Hamilton Aaf Lf #26 - A Parent (Fuds) 1 Burma Road Novato CA Aviation, Diesel, Gasoline, Waste Oil / Motor / Hydraulic / LubriCAting Other Groundwater (Uses Other Than Drinking Water), Soil The Hamilton Army Airfield Was A 1,600 Acre Military Installation Located Approximately 22 Miles North Of San Francisco On San Pablo Bay In Marin County, CAlifornia. The Military Installation Was Bounded On The North By The North Antenna Field (A Formerly Used Defense Site), Private Agricultural Lands, And A Private Residential Community (Bel Marin Keys); On The East By State-Owned Land And San Pablo Bay; On The South By Private Agricultural Fields; And On The West By Nave Drive, Which Parallels State Highway 101. The Landfill 26 Area Is Approximately 26 Acres In Size Within The Greater Hamilton Aa Facility. Hamilton Army Airfield Was Constructed On Reclaimed Tidal Mud Flats By The Army Air Corps In 1932. The Site, Previously Known As Marin Meadows, Had Been Used As Ranch And Farm Land Since The MexiCAn Land Grant. Military Operations Began In December 1932, First As A Base For Bombers, And Later As A Base For Transport And Fighter Aircraft. The Base Played A Major Role During World War Ii As A Training Field And Staging Area For Pacific Operations. During The War, The Base Hospital Served As An Acute CAre And Rehabilitation Facility For Thousands Of War CAsualties Per Month. The Base Was Renamed Hamilton Air Force Base In 1947, When It Was Transferred To The Newly Created U.S. Air Force (Usaf). The Usaf Used The Base Primarily As A Training And Fighter Installation Until 1975. The Usaf Ended Military Operations At The Base In 1976, And The Property Was Declared Surplus By The Department Of Defense. In 1976, The Army Began Aircraft Operations At The Airfield And Supporting Facilities With Permission Of The Usaf. In 1984, The Airfield Property Was Officially Transferred Back To The Army And Renamed Hamilton Army Airfield. The Base Was Declared Surplus Under The Brac Act Of 1988. The Army Continued To Use The Airfield Primarily For Army Reserve Aircraft Operations Until March 1994. Currently, The Brac Property Is Managed By The Department Of The Army, I Corps, At Fort Lewis, Washington (As Of February 2004). Pg&E - Mgp - San Rafael Third St And Brooks Ave San Rafael CA Other Groundwater (Uses Other Than Drinking Water), Soil Dtsc Involved With Site, Wdr No. 85-80. For More Info See Dtsc's Web Site - Environstor, CAse 21490015 Some Remediation Done, A Large ExCAvation Is Planned Starting Late 2015 * Unk, Groundwater Monitoring, Site Assessment/Site Investigation Change Operating Procedures, Other Means Mgp Plant Closed Long Ago Anne Dick Jewelery 1525 Mesa Rd Point Reyes CA * Metals Soil Pt Reyes Station City Of Sewer Service 11966 State Rt 1 Point Reyes Station CA Gasoline Under Investigation Tank Closure Shell 1390 Novato Blvd S Novato CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Shell Oil Company Operated A Station At The Site Since At Least 1958. In 1977, The Station Was Remodeled From A Full-Service Station To A Self-Service Station, And Three Double-Walled, 10,000-Gallon Underground Storage Tanks (USTs) Were Installed. Shell Sold The Station During 2010, And Now The Station Is Operated As An Independently Owned Shell-Branded Service Station. The Site Is Located On The Eastern Corner Of The Intersection Of Rowland Boulevard And South Novato Boulevard In Novato, Marin County, CAlifornia . The Previous Station Layout Included Three Underground Fuel Storage Tanks (USTs), Two Dispenser Islands Each With Two Product Dispensers Each, A CAr Wash, And A Food Mart/Kiosk. The Ground Surface At The Site Is Covered With Asphalt And Concrete, And Topography Is Generally Flat, With Surface Drainage Towards South Novato Boulevard And Rowland Boulevard. To The North And East Are Commercial Parcels, While To The West And Southwest Are Primarily Residential Properties. Southeast Of The Site Is A Church, Private School, And Park. Northeast Of The Site Is The Church?S Asphalt Parking Lot, Which Also Serves As A Basketball Playground. Emcon Associates, Inc. Installed Four Groundwater Monitoring Wells (S-1 Through S-4) At The Site During August 1985 To Investigate Groundwater Conditions. Tank Closure Barboni Brothers Rental 759 Hicks Valley Rd Petaluma CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Fort Mcdowell - Fort Mcdowell/ Angel Island (J09CA080500) - A Parent Angel Island Tiburon CA Diesel, Gasoline, Heating Oil / Fuel Oil Fort Mcdowell Has Been Identified As A Formerly Used Defense Site (Fuds). The History Of The Island Includes Various Military Uses As Well As An Immigration And Quarantine Station. Military Use Included Harbor Defense Batteries, Civil War Era Garrison, World War I1 Debarkation Station, Prisoner Of War CAmp, And Nike Missile Station. The Island Is Currently Used As A State Park. There Are Numerous USTs And Asts Associated With This Site. Based On The History Of The Island, Five Separate Use Areas Were Identified: North Garrison, East Garrison, Alaya Cove, West Garrison, And Point Blunt. Various. Marin Manufacturing Inc 191 Mill St San Rafael CA Stoddard Solvent / Mineral Spriits / Distillates Other Groundwater (Uses Other Than Drinking Water) Tank Closure Chevron 532 Magnolia Ave Larkspur CA Waste Oil / Motor / Hydraulic / LubriCAting Other Groundwater (Uses Other Than Drinking Water) Tank Closure Butcher Property 472 Wilson Ave Novato CA Gasoline Under Investigation Tank Closure CAltrans Highway 101 Novato CA Waste Oil / Motor / Hydraulic / LubriCAting Soil Tank Closure San Anselmo Auto Repair 100 Sir Francis Drake Blvd San Anselmo CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Stein Property 5885 LuCAs Valley Rd NiCAsio CA Gasoline Soil Tank Closure San Rafael City Of Corporation Yard 790 Lincoln Ave San Rafael CA Other Metal, Gasoline, Methane, Polynuclear Aromatic HydroCArbons (Pahs) Other Groundwater (Uses Other Than Drinking Water) The Subject Property (Site) Is A VaCAnt Lot Of Paved Asphalt And Concrete Foundation Remains, Formerly Occupied By A Shell- Branded Automotive Refueling Facility (Gas Station) On The North End, And Also Formerly A City Of San Rafael Corporation Yard On The Southern Extent. The Property Is Bordered By San Rafael Creek To The East And South With Lincoln Ave To The West, 2nd Street To The North. The Shell Station Portion Of The Site Was Reportedly Leased From The City Of San Rafael Beginning In 1962, The Gas Station Constructed In 1963, And Demolished In 1998. The Facility Reportedly Was Initially An Auto Repair And Fueling Station, Which Included Fuel Dispensing Areas And A Garage Building With Three Service Bays With Hydraulic Lifts; It Was Later Converted To Solely A Fueling Station With A Food Mart In The Area Of The Former Service Garage. Three Fuel USTs Were Located In The Eastern Portion Of The Property. A Waste Oil Ust Was Formerly Present West Of The Former Shell Service Building. Numerous Soil And Groundwater Investigations Have Been Conducted At The Former Shell Facility (E.G., Hla, 1985, 1991, 1992; Mfg,1996, 1999; Cet,1998). Soil And Groundwater Have Been Impacted By Releases From The Four Former On-Site Fuel Storage Tanks And Product Conveyance Lines, The Former Waste Oil Tank And Fill Lines, And, Potentially, Off-Site Sources, By Tph As Gasoline, And Associated Fuel Constituents (E.G., Btex/Mtbe), Tph As Diesel, Tph As Motor Oil, And Several Pahs, In The Eastern, Northeastern, And Western Portions Of The Site. Gasoline As Free Product Has Reportedly Been Noted In The Northeastern And Northern Portions Of The Site HistoriCAlly. Groundwater Extraction And Treatment From An Interceptor Trench Was Performed From 1994 To 1997. Ust Removal, Including Soil Removal, Was Performed In 1987 And 1998. Additional Soil Removal Was Planned In The North And Northeastern Portion Of The Site In Late 2005 Within, And North/Northeast Of An Historic 42-Ft Wide, Sub-Grade, Circular Concrete Structure (Believed To Be A Former Salt Water Tank). Tph As Gasoline, And Associated Constituents, Remain In Soils Along The North And Northeastern Property Boundary, Possibly Including Free Product. Periodic Groundwater Monitoring Is Conducted At The Site In Selected Monitoring Wells By Shell. The City Of San Rafael Corporation Yard Was HistoriCAlly Occupied By The San Rafael Municipal Baths Which Comprised A Building (Known As The ?Bath House?) Housing A Salt Water Swimming Pond Located In The Center Of The Property From 1915 To 1929. After Closure, The Pond Was Filled In And The Bath House Reportedly Occupied By A Boiler Manufacturing Company. By 1938, The Expanded Building Occupied The Central And Northern Portion Of The Property, While The Southern Portion Was A Pond And Marsh. Railroad Tracks Ran Along The Opposite Side Of The Creek. The Building Was Destroyed By Fire In 1949. By 1952, The Northern Portion Of The Site Was Parking, While The Southern Was A Baseball Field. The Corporation Yard Was Reportedly Constructed In 1970 And Used By Various Departments Of The City Of San Rafael Public Works As A Storage And Service Yard. The Corporation Yard Was Closed In Approximately 2001 And The Buildings Demolished In 2006. Tank Closure Private Residence Private Residence Bolinas CA Waste Oil / Motor / Hydraulic / LubriCAting Other Groundwater (Uses Other Than Drinking Water) The Bolinas Community Land Trust (Land Trust) Purchased The Site In May 2004. Currently The Site Has An Operating Gas Station With Three (3) Underground Storage Tanks (USTs); 4,00-Gal, 2,000-Gal, And A Single 1,000-Gal Tank. The Structure Has An Apartment Above Three (3) Smaller Retail Units. The Land Trust Plan To Develop Two Units For Low-Income Housing On The Site. Prior To The The Purchase Of The Property, There Was Some Amount Of Cleanup, Yet Petroleum Contamination Remains On Site. There Is Evidence Of Former 550-Gal Waste-Oil Tank (Wot) Removal In 1999. Both Soil And Groundwater Are Affected By HydroCArbons. New USTs Were Installed In The Year 2000. Subsurface Monitoring Close And Remove Tank Mill Valley Afs East Ridgecrest Blvd., Mt Tamalpais Mill Valley CA Under Investigation Mill Valley Afs Is Currently Listed As A Part Of The Golden Gate National Recreational Area, However Soon This Will Be Its Own Fuds Site. Start Date Tba. L&M Cleaners 2001 Novato Blvd Novato CA * Tetrachloroethylene Soil 14 Commercial Blvd 14 Commercial Blvd Novato CA Xylene Soil Review Of Original Spill Form Lead To Contacts With Marin County Personnel Which Resulted In Their Cupa Agency Providing Correspondence From Dtsc That Documented ExCAvation Was Completed (Exact Date Field Work Occurred Unknown But Had To Be Between May Through September Of 1987) With Associated Sampling That Resulted In Dtsc's Approval For Emplacement Of Clean Backfill. Based On This The Regional Board Issued A CAse Closure Letter On August 30, 2016. Former Golden State Lumber 600 Francisco Blvd W San Rafael CA Diesel Other Groundwater (Uses Other Than Drinking Water) Tank Closure Meadow Club 1001 Bolinas Fairfax Road Fairfax CA Heating Oil / Fuel Oil Surface Water Nuisance Conditions Petroleum Odors Noted In A Stormwater Sewer Grating Close And Remove Tank Hamilton Army Airfield - Hamilton Army Airfield - Pol Hill 1 Burma Road Novato CA Aviation, Diesel, Gasoline, Waste Oil / Motor / Hydraulic / LubriCAting Other Groundwater (Uses Other Than Drinking Water), Soil The Pol (Petroleum, Oil, And LubriCAnt) Outparcel Lies Within The Upland Portion Of Hamilton Army Airfield, On The North Side Of A Ridge Known As Reservoir Hill And Southwest Of West Boundary Road. The Pol Outparcel Is Separated From The Main Portion Of The Brac Property By Approximately 200 Feet And Is Bounded By The Gsa Phase Ii Sale Area. The Pol Outparcel Operated As The Base Fuel-Storage Center From 1942 Until Prior To May 1986, When The Storage Tanks Were Removed. All Tanks Stored Jp-4, Except Possibly The 750-Gallon Storage Tank, For Aircraft Operations. Discharges Of Jet Fuel And Other Petroleum Products May Have Impacted The Soil And Groundwater At The Pol Outparcel. The Pol Outparcel Contained Three Main Environmental Features: 1) A Former Tank Farm (Twenty 25,000-Gallon USTs, One 25,000-Gallon Ast, And One 750-Gallon Ust), 2) A Former 850,000-Gallon Ast And Associated Piping (Ast-2), And 3) The Landfill 26 Groundwater Treatment Facility. The Pol Outparcel - Except The Ast-2 Area - Was Recommended For Closure In 2004. Tph Contamination In The Ast-2 Area Is Treated Separately. The Corrective Action Plan (2004) Recommended Monitored Natural Attenuation As The Final Remedy. Groundwater Monitoring In The Ast-2 Area Is Ongoing. Close And Remove Tank Tosco - Facility #2441 34 Ritter St San Rafael CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Exxon Chevron Former 600 Magnolia Ave Larkspur CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Subsurface Monitoring Mr Trees Former 343 San Anselmo Ave San Anselmo CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Arnold's Dismantlers 864 Vallejo Avenue Novato CA Diesel, Gasoline, Total Petroleum HydroCArbons (Tph), Waste Oil / Motor / Hydraulic / LubriCAting Other Groundwater (Uses Other Than Drinking Water), Soil * Gov Peacock Property 153 Lagunitas Dr Ross CA Gasoline Soil Tank Closure Novato Ford 6995 Redwood Blvd Novato CA Gasoline Other Groundwater (Uses Other Than Drinking Water) On September 22, 1997, One 2000-Gallon Ust For Gasoline Was Removed From The Site. The Ust Appeared To Be Intact, But There Were Fuel HydroCArbon Odors And Floating Product In The ExCAvation. Concentrations Of Total Petroleum HydroCArbons As Gasoline (Tphg), Btex Were Not Detected In The Soil Samples Collected From The ExCAvation. However, Mtbe Was Detected From 1.0 Milligrams Per Kilogram (Mg/Kg) To 5.1 Mg/Kg In Soils. A Water Sample From The ExCAvation Contained Tphg, Benzene, And Mtbe At 150,000 Micrograms Per Liter (µg/L), 9,900 µg/L, And 210,000 µg/L. During ExCAvation To Remove The Former Ust In September 1997, 20 Cubic Yards (Cubic Yards) Of Impacted Soil Were Taken To Redwood Landfill In Novato, CAlifornia, For Disposal. Numerous Exploratory Soil Borings Including Nine Mws Have Been Advanced At And Around The Site. To Remediate Impacted Soil And Groundwater, An Ozone/Hydrogen Peroxide Injection Remediation System Operated At The Site From February 2008 To February 2013. Following Operation Of The Remediation Unit, Hotspot Remediation Events Consisting Of The Direct Injection Of Hydrogen Peroxide Mixture Into Select Mws Were Conducted On August 18, 22 And 28, 2014, September 5, 12, 19 And 26, 2014, And October 3, 2014. Following The Hotspot Remediation Events, The August 20, 2015, June 2015 Groundwater Monitoring/Low Threat Closure Policy Evaluation/Closure Request Report, Included The Following Conclusions And Recommendations: ? The Ozone And Hydrogen Peroxide Injection Remediation System Effectively Remediated The Impacted Groundwater. Groundwater AnalytiCAl Results Show That Residual Concentrations Have Decreased To Very Low Or Non-Detectable Concentrations Below Regulatory Levels Of Concern. Following The Shutdown Of The Remediation System In February 2013, The Regional Water Board IndiCAted That The Remaining ChemiCAl Of Concern In Groundwater Was Tba, Down Gradient Of The Former Ust In The Vicinity Of Mw-5 And Mw-5d. ? Tba Hotspot Remediation Was Then Conducted. Current Tba Concentrations In Most Of The Wells Sampled In April 2014 And In January - June 2015 Are Substantially Lower Than Historic Tba Concentrations And The Tba Plume Is Defined By The Mw-6, Mw-7, And Mw-8 Located In Hill Road, Adjacent To The Site. . Groundwater AnalytiCAl Data IndiCAtes That The Tba Plume In Groundwater Is Decreasing And Defined. In The Down Gradient Direction (Westerly), The Tba Plume In Groundwater Does Not Extend Beyond Hill Road. This CAse Meets The Low-Threat Closure Criteria In The State Water Resources Control Board?S Low-Threat Underground Storage Tank CAse Closure Policy (Ltcp), As Shown Below. General Criteria A. The Site Is Located Within The Service Area Of The North Marin Water District; B. The Unauthorized Release Consists Only Of Petroleum; C. The Site?S Primary Release Has Been Stopped; D. No Petroleum Free Product Has Been Reported At The Site Since May 2009; E. A Conceptual Site Model That Assesses The Nature, Extent, And Mobility Of The Release Has Been Developed; F. Secondary Source Has Been Removed/Remediated To The Extent PractiCAble; G. Soil And Groundwater Has Been Tested For Mtbe And Results Reported In Accordance With Health And Safety Code Section 25296.15; And H. Nuisance As Defined By CAlifornia Water Code Section 13050 Does Not Exist At The Site. Media Specific Criteria 1. Groundwater - The Site Meets Class 1 Of The Groundwater Specific Criteria. The Petroleum HydroCArbon Plume Exceeding Water Quality Objectives Is Less Than 100 Feet In Length, There Is No Petroleum Free Product Currently At The Site, And There Are No Water Supply Wells And Surface Water Bodies Within 250 Feet Of The Plume Boundary. 2. Vapor Intrusion To Indoor Air ? The Site Meets Scenario3a Of The Vapor Intrusion Specific Criteria. Benzene Concentration In Groundwater Is Less Than 100 µg/L And The Total Tph (Tph-G And Tph-D Combined) Is Less Than 100 Mg/Kg Within The Top Five Feet Of Soil. 3. Direct Contact And Outdoor Air Exposure ? Benzene And Ethylbenzene Soil Concentrations Do Not Exceed The Direct Contact And Outdoor Air Exposure Ltcp Criteria For Residential And Commercial/Industrial Uses. Naphthalene Analysis Has Not Been Conducted At This Site. Based Upon The Low Concentrations Of Tph And Btex Remaining In Soil And Groundwater, The Former Ust Stored Gasoline And Not Diesel, And The Operation Of An Ozone/Hydrogen Peroxide Injection Remediation System For Five Years At The Site, Residual Naphthalene Concentration In Soil Is Expected To Be Below The Ltcp Direct Contact And Outdoor Air Exposure Table 1 Concentration Criteria. Tank Closure Pacific Bell Unknown Lighthouse Rd Point Reyes Station CA Diesel Soil Tank Closure NiCAsio School 5555 NiCAsio Valley Rd NiCAsio CA Diesel Aquifer Used For Drinking Water Supply, Other Groundwater (Uses Other Than Drinking Water) A School Has Occupied The Site Since 1871. A Shallow (Screened From 10.5 To 17 Feet Bgs) Drinking Water Well For The School Was Installed On 8/21/01, About 360 Feet Sw Of The Former Ust. Lake NiCAsio, A Drinking Water Reservoir Is Located About 200 Feet From Site During High Water Levels. A Heating Oil Ust Along With 1420 Gallons Of Heating Oil, 160 Gallons Of Oily Water, And 30 Cubic Yard Of Soils Were Removed From The Site In May 2001. ExCAvated Soil Contained 1,500 Mg/Kg Of Tph-D With Low Or Non-Detectable (Nd) Concentrations Of Mtbe And Btex. Confirmation Soil Samples Form The Sidewalls Of The ExCAvation Contained A Maximum Of 1.3 Mg/Kg Of Tph-D And Low Or Nd Concentrations Of Mtbe And Btex. A Grab Groundwater (Gw) Sample Collected From The Ust ExCAvation Contained 99,000 Ppb Of Tph-D, And Low Concentrations Of Mtbe And Btex. On 12/3/01, Three Soil Borings Were Advanced And One Monitoring Well (Mw-1) Was Installed Midway Between The Former Ust And The Drinking Water Well. Soil Samples From The Borings Contained Up To 77 Mg/Kg Of Tph-D, And Mostly Nd Concentrations Of Btex. Grab Gw Samples From The Borings Contained Up To 2,000 Ppb, Of Tph-D And Mostly Nd Concentrations Of Mtbe, Btex, And Pnas. Mw-1 And The Drinking Water Well Were Sampled And Analyzed Six And Seven Times, Respectively, After Installation, And Except For One Questionable Detection Of Tph-D At 78 Ppb, The Samples Have Always Been Below Detection Limits For Tph-D, Mtbe, Btex, And Pnas. Based On The Following, CAse Closure For This Site As A Low Risk Soil And Groundwater CAse Is Considered To Be Appropriate: (1) The Primary Source (One 1500-Gallon Heating Oil Ust) Has Been Removed Under Permit From The Site. The Secondary Sources Were Also Removed. Impacted Groundwater Was Pumped From The ExCAvation And The Ust At The Time Of Ust Removal. 30 Cubic Yards Of Impacted Soils Were ExCAvated And Transported Offsite. Heating Oil Impacted Soils And Groundwater Have Been Removed To The Extent PractiCAble. (2) The Degree Of Impact To Groundwater Is Minor And The Extent Of The Impact To Groundwater Is Limited To The Immediate Vicinity Of The Former Ust ExCAvation. Deeper Aquifers Are Not Likely To Be Impacted By The Release BeCAuse Bedrock Is Shallow In The Area Of The Release, And The Contaminants Are Less Dense Than Water 3) The Lateral And VertiCAl Extent Of Heating Oil Impacted Soil And Groundwater Has Been Adequately Characterized. Nearby Sensitive Receptors That Could Be Impacted By The Release And Migration Pathways Have Been Identified. The Closest Domestic Water Well Is 360 Ft From The Former Ust LoCAtion. This Well Has Been Tested, And Is Not Impacted By The Release(S) From The Former Ust. 4) Btex Appears To Be Absent From Soil, And Only Minor Concentrations Were Found In The Grab-Groundwater Sample From The Ust ExCAvation (Table 1), Precluding A Potential Vapor Intrusion Problem. 5) The Known Current Residual Concentrations In The Soil And Groundwater Do Not Represent A SignifiCAnt Current Or Future Public Health, EcologiCAl, And Water Resources Threat. There May Be A Small Risk To Human Health That Could Be Easily Manageable If Future ExCAvations Extend To Below The Water Table In The Near Vicinity Of The LoCAtion Of The Former Ust. The Potential Risk Could Be Mitigated By Preparing A Soil And Groundwater Management Plan (Sgmp). The Sgmp Would Describe Procedures To Notify The Appropriate Regulatory Agencies, Protect Worker?S Health, And Manage Impacted Soil And/Or Groundwater If It Is Encountered. Other Means Marin CAr Wash 2066 Redwood Hwy Larkspur CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Marin CAr Wash Is Adjacent To Richardson Bay. Subsurface Monitoring Nike Battery 93, Sf (J09CA094400) - Aoi 2 - S-131 Missile Assembly And Test Building 290 Smith Ranch Road San Rafael CA Diesel, Xylene Soil Aoi 2: Missile Assembly And Test Building Ust?The June 1970 General Site Map Documented A 275-Gallon Fuel Oil Ust (S-131) Located Approximately 10 Feet Southeast Of The Missile Assembly And Test Building (S-120). At The Same LoCAtion, Mrl Underground Tank Testing, Inc., Under Contract With The Usace, Documented Discovering An ?Unexpected? 550- Gallon Ust During Removal Of The Drainage Pipe And Grading Of The Area South Of The ElectriCAl Power Plant Ust ExCAvation Site. The February 1956 Assembly Area Site Plan Documented A Drainage Pipe Close To The Previously Mentioned 275-Gallon Ust And, According To The June 1970 General Site Map And A GeotechniCAl Branch Tank Site Map, A Concrete Slab Was Present Northeast Of The USTs. Based On These Findings, It CAn Be Concluded That These Two Tanks Are The Same. Confirmatory Soil Samples Were Taken Beneath The Associated Piping And Tank At An Unspecified Depth. Tph-D Were Found In Soil Samples At Concentrations Of 1,300 Parts Per Million (Ppm) Along Associated Piping 36 Feet North Of The Tank, 220 Ppm Tph-D At 26 Feet North Of The Tank Along Same Piping, And 290 Ppm Tph-D Directly Beneath The Tank. Soil Samples Were Also Analyzed For Btex. Trace Concentrations Of Xylenes Were Found In Water Samples 36 Feet North Along Piping And Directly Beneath The Ust At Concentrations Of 91 Parts Per Billion (Ppb) And 59 Ppb, Respectively. No Stressed Vegetation Or Staining Was Visible During The Site Visit. Documents Pertaining To This Site Are Within The ?Closed CAse? Files At The Mcowm Under The ?Mcinnis Golf Course? Filename. Documentation Was Not Found Regarding Beneficial Use Of This Ust. Close And Remove Tank Pacific Supply 61 Jordan St San Rafael CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Redwood Oil Company Bp 1789 Sir Francis Drake Blvd Fairfax CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure West Marin Landfill Highway 1 Point Reyes Station CA Exxon 902 Irwin St San Rafael CA Gasoline Under Investigation Tank Closure Us Postal Service 40 Bellam Blvd San Rafael CA Gasoline Soil 2008 Confirmation Investigation- All Looks Good, To Be Closed Tank Closure Alliance 732 4th San Rafael CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure East Fort Baker - Bldg. 639/723 Sommerville Rd. Sausalito CA Novato Community Hospital 1625 Hill Rd Novato CA Diesel Other Groundwater (Uses Other Than Drinking Water) Tank Closure Former Chevron #9-6988 3 Loch Lomond Dr San Rafael CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Nps- North District Operations Center 17400 Sir Francis Drake Blvd. Inverness CA Gasoline Other Groundwater (Uses Other Than Drinking Water) The Subject Property (Site) Is The North District Operations Center Facility (Operations Center) Located Within The Point Reyes National Seashore, 1 Mile East Of The Pacific Ocean. The Site Has A Main Building Restored And Currently Used By The Maritime Radio HistoriCAl Society (Mrhs) As A Functioning Kph Radio Station Facility. The Center Once Operated As An RCA CommuniCAtion Facility (CirCA 1929) And Included A Generator With An On- Site Fuel Supply Of A Single (1) 700-Gal Diesel Underground Storage Tank (Ust) Located At The Northwest Corner Outside The Former Generator Building. Surrounding Areas Consist Of Natural Park Open Space And Dairy Farm Range Lands. The Ust Was Removed In 2006. Petroleum HydroCArbons And Associated Compounds Were Discovered In Soil And Groundwater On Site. Total Petroleum HydroCArbons As Diesel (Tphd) Were Reported Up To 12,000 Mg/Kg In Soil, And 12,000 Ug/L In Groundwater, Total Petroleum HydroCArbons As Gasoline (Tphg) At 590 Ug/L And Lead At 440 Ug/L. For Example, Environmental Screening Levels (Esls) For Lead In Groundwater Is 2.5 Ug/L. Tank Closure Close And Remove Tank Loch Lomond Marina, West Jetty Area, Ust Site 110 Loch Lomond Dr San Rafael CA Aviation, Gasoline Other Groundwater (Uses Other Than Drinking Water), Surface Water The Subject Property (Site) Is A 29.5-Acre, 11-Dock Recreational Marina. The Western-Most Dock And Jetty Area Houses A Fuel Terminal Which Has Been Previously Investigated; A Corrective Action Plan (CAp) For This Area Was Subjected To Public Comment And Approved By The Rwqcb In April 2008 (Trc, 2008). A Boat Repair Shop Is Located To The West Of The Fuel Loading Dock. To The East Of The Launch Ramp, Several Buildings Containing A Yacht Club, Offices, A Restaurant, And A Yacht Sales Store Are Situated. Another Structure On The Northeastern Portion Of The Site Houses A Supermarket, Offices, Small Shops, And A Dry Cleaner. The Remainder Of The Site Is Comprised Of Boat Storage, Parking Spaces, And VaCAnt Lots. The VaCAnt Lot At The Current Of Loch Lomond Drive And Point San Pedro Road Was A Chevron Service Station Until 1987. This Site, A Former Lust Site, Was Closed By The Rwqcb Following Investigation And Remediation, In 1997. The Planned Redevelopment At Loch Lomond Marina Will Be A Master Planned Community Between Point San Pedro Road To The North And San Rafael Bay To The South, Including New Residential And Commercial Development, As Well As The Current Marina Uses. Environmental Results Tphg Was Detected At Concentrations Ranging From 0.31 To 6,100 Milligrams Per Kilogram (Mg/Kg) In The Soil Samples. Tphg Concentrations In 17 Of The Samples Exceed The Site Specific 2008 CAp Target Cleanup Goal Of 450 Mg/Kg And The Table B Esl Of 500 Mg/Kg. Tphd Was Detected At Concentrations Ranging From 9.4 To 300 Mg/Kg In The Soil Samples. Tphd Concentrations In Three Of The Nine Samples Tested Exceed The Target Cleanup Goal Of 150 Mg/Kg. Tphmo Was Detected At Concentrations Ranging From 70 To 500 Mg/Kg, In All CAses, Below The Target Cleanup Goal Of 2,500 Mg/Kg. Tank Closure Xtra Oil Company 340 Miller Ave Mill Valley CA Gasoline Other Groundwater (Uses Other Than Drinking Water) The Site Is Currently Occupied By A Gasoline Station. On September 19, 1995, A Subsurface Investigation Was Conducted In Response To AnalytiCAl Results From A Groundwater Sample From The Tank Pit Observation Well. The Investigation Consisted Of The Advancement Of Ten Soil Probes And The Collection Of Soil And Groundwater Samples. Soil Samples Collected At The Time Showed A Maximum Detected Tph-G Concentration Of 12,000 Mg/Kg, And Maximum Detected Benzene, Toluene, Ethylbenzene And Xylenes (Btex) Concentrations Of 180, 410, 230 And 1200 Mg/Kg, Respectively. Groundwater Samples Collected Showed A Maximum Detected Tph-G Concentration Of 160 Mg/Kg, And Maximum Detected Btex Concentrations Of 17, 12, 2.8 And 16 Mg/Kg, Respectively. On October 9 And 10, 1995, Two 10,000 Gallon Gasoline USTs Were Removed From The Site And Replaced With New USTs. 600 Cubic Yards Of Soil Were Removed During The Ust Replacement Project. No Soil Confirmation Samples From The Limits Of The ExCAvation Were Collected. On October 19, 1995, The Product Piping Were Removed Along With 50 Cubic Yards Of Soils. Soil Confirmation Samples Contained Up To 710 Mg/Kg Of Tph-G And 4.2 Mg/Kg Of Benzene. Three Monitoring Wells (Mws) Were Installed In 1996 And 1997. Groundwater Samples From The Mws Were Analyzed For Tph-G, Btex And Methyl Tertiary-Butyl Ether (Mtbe). Only Mtbe Was Detected In The Mws, With Concentrations Decreasing Over Time. The Maximum Mtbe Concentration Detected At The Subject Site Was On 11/20/96 In Mw-2at 1,000 Ppb. The Concentration Of Mtbe Decreased To 9.0 Ppb In Mw-2 On 5/8/08. On June 21, 2001, P&D Conducted A Subsurface Investigation (Boreholes B1-B6) In The Vicinity Of The Subject Site. Grab Groundwater Samples Show That Mtbe Was Detected In B4 And B5 At Concentrations Of 4,600 And 190 Ppb. Tph-G Was Detected Only In B5 At A Concentration Of 120 Ppb. On March 21, 2003, P&D Conducted An Additional Subsurface Investigation (Boreholes B7-B14) In The Vicinity Of The Subject Site. Grab Groundwater Samples Show That Mtbe Was Not Detected In Any Of The Samples. Tph-G And Btex Compounds Were Detected Only In Boreholes B13 And B14, Which Are Located Within 40 Feet Of An Automotive Oil Change Facility. The Detected Tph-G & Btex Are Believed To Be Unrelated To The Subject Site. P&D Prepared A Site Conceptual Model Report Dated June 22, 2012, That Included A Sensitive Receptor Survey That Reviewed Well Search And Surface Water Search Results. The Nearest Potentially Sensitive Receptors Include The Presidio Del Madera Creek Approximately 320 Feet To The Southeast Of The Site, And An Inactive Well Approximately 530 Feet To The Southeast Of The Subject Site. Sites With Known Petroleum HydroCArbon Releases Are Located Downgradient Of The Subject Site Between The Subject Site And Both The Creek And The Irrigation Well. Due To The Distance From The Suspected Mtbe Plume Edge To The Nearest Sensitive Receptor, P&D Concluded That Impact To Sensitive Receptors Is Unlikely. Based On The Following, CAse Closure For This Site Is Considered To Be Appropriate: (1) The Site Has Been Adequately Investigated (The Only Contaminant Of Concern Is Mtbe); (2) The Primary Source (The Two USTs That Formerly Occupied This Site) Have Been Removed Along With More Than 600 Cubic Yards Of Impacted Soil; (3) The Residual Concentrations In The Soil And Groundwater Are Low And The Groundwater Plume Is Stable And Is Expected To Decrease; (4) The Nearest Sensitive Receptors (Creek And Irrigation Well) Are Beyond The Edge Of The Known Mtbe Plume. Therefore, The Release(S) Is Not Likely To Impact A Sensitive Receptor; And (5) The Residual Concentrations In The Soil And Groundwater Do Not Represent A Current Or Future Public Health, EcologiCAl, And Water Resources Threat. Subsurface Monitoring Marin CAr Wash 584 Redwood Hwy Mill Valley CA Gasoline Other Groundwater (Uses Other Than Drinking Water) The Subject Property (Site) Is A Relatively Level Parcel Occupying Approximately 20,000 Square Feet Along The Eastern Side Of Redwood Highway And Approximately 400 Ft North Of De Silva Island Drive In Mill Valley, CAlifornia. The Surrounding Properties Are Primarily Commercial/Retail Businesses Along Redwood Highway North And South Of The Site With Residential Properties Located Further South On De Silva Island Drive. Strawberry Marsh Is Adjacent The Property To The East, While Highway 101 Is West Of The Site. BeCAuse Of The Proximity Of The Site To Strawberry Marsh (Connected To Richardson Bay), The Site And Surrounding Area Are Highly Susceptible To Flooding During Heavy Rainfall And Extreme High Tides. The County Of Marin Public Works Department Apparently Plans To Install A Pumping Station Within This Area In An Attempt To Mitigate The Flooding. Release In 1982, An Accidental Release Of 5,000 Gallons Of Fuel Occurred At The Site During The Ownership Of Mr. Hippenmeyer (Mr. Shimek Commenced Operation Of The Site USTs In Approximately 1996 And Purchased The USTs/Property From Mr. Hippenmeyer In 2005). Approximately 4,500 Of The 5,000 Gallons Of The Released Fuel Was Reportedly Recovered And Properly Disposed. An Extraction Trench Was Reportedly Installed In 1988 Between The Release Area And Strawberry Marsh And Groundwater Was Pumped Out Of The Trench For Six Months (Rwqcb, 2008). Site Photographs IndiCAte The Extraction Equipment Was Housed On A Small Island Located Near The Southern Boundary Of The Site In The Middle Of The Open Area Between 584 And 580 Redwood Highway. A Grab Groundwater Sample (Pt-1) Was Collected In February 2007 Which Contained Concentrations Of Tphd (1,300,000 μG/L), Tphg (84,000 μG/L) And Benzene (1,500 μG/L), But No Methyl Tert-Butyl Ether (Mtbe) (<250 μG/L). The Maximum Tphg And Benzene Concentrations Detected Were 2,100 μG/L And 460 μG/L, Respectively, In Well Mw-Mcw3. The Only Detected Mtbe Concentration Was 180 μG/L, In Source Area Well Mwmcw3. Constituent Concentrations Detected In Wells Mw-Mcw2 And Mw-Mcw3 Are SignifiCAntly Lower Than Concentrations Detected In February 2009. For Example, The Benzene Concentration In Well Mw-Mcw2 Reduced From 2,200 μG/L (February 2009) To 53 μG/L This Event (September 2013). Other Means Novato Unified School District 819 Olive St Novato CA Diesel Aquifer Used For Drinking Water Supply, Other Groundwater (Uses Other Than Drinking Water), Soil In August 1989, One 2,000-Gallon Diesel And Two 550- Gallon Gasoline USTs Were Removed From The Center Of The Maintenance Yard And One 1,000-Gallon Waste Oil Ust Was Removed From The Southeast Corner Of The Maintenance Yard. Petroleum HydroCArbons (As Free Product) Were Observed Floating On The Groundwater Surface In Both The Fuel And Waste Oil Tank ExCAvations. In September 1989, 14 Soil Boring Were Drilled To Assess The Lateral Extent Of Contamination. (12/05/2001 Soil And Groundwater Investigation) Tank Closure Janet Williams Trust 128 CArlos Dr San Rafael CA Stoddard Solvent / Mineral Spriits / Distillates Other Groundwater (Uses Other Than Drinking Water) Tank Closure East Fort Baker - Bldg 505-1 505 Mcreynolds Rd. Sausalito CA S & H Liquidation Service 25 Corte Madera Ave Mill Valley CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Shell 755 2nd St San Rafael CA Diesel, Gasoline, Waste Oil / Motor / Hydraulic / LubriCAting Other Groundwater (Uses Other Than Drinking Water) Multiple ExCAvations Done. Some Remaining In Soil In Ne Corner Due To Depth And Several Utilities. To Be CApped Under A Parking Lot. Covered By Deed Restriction And Soil Management Plan With Adjoining Property. See CAse 21-0341. Tank Closure Kerner Automotive Center 3241 Kerner Blvd San Rafael CA Stoddard Solvent / Mineral Spriits / Distillates Other Groundwater (Uses Other Than Drinking Water) Tank Closure Marin Mazda Aka Triple S Tires 807 Francisco Blvd San Rafael CA Waste Oil / Motor / Hydraulic / LubriCAting Other Groundwater (Uses Other Than Drinking Water) Tank Closure Perry Property 130 Sir Francis Drake Blvd San Anselmo CA Gasoline Soil Tank Closure Black John Slough Rancho Del Pantano 8190 Binford Rd Novato CA Redwood Oil Company Texaco 570 Redwood Hwy Mill Valley CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Currently, The Site Is An Active Gas Station Situated On Fill At Five Feet Above Mean Sea Level. Gas Stations Have Operated At The Site Since At Least 1982. The Area Is Zoned For Commercial Uses. The Closest Surface Water Is Strawberry Marsh, Located Immediately East Of The Site. Environmental Activity At The Site Started In June 1982 When After An Apparent Leak, Three Monitoring Wells (Mws) And One Extraction Well (Ew) Was Installed Along With A French Drain System. To Date, There Has Been 29 Mws Installed Onsite And Offsite Along With One Groundwater Ew Well, 125 Onsite And Offsite Soil Borings. Free Product (Fp) Has Been Detected In Some Of The Monitoring Wells In The Mid-1980s. 97,000-Gallons Of Groundwater Were Removed During The 2000 Ust Replacement. A Variety Of Remedial Activities Have Been Performed Consisting Of Groundwater Extraction, French Drain System, Separate-Phase HydroCArbon Removal System, And Several ExCAvations Removing Approximately 2,200 Tons Of Impacted Soil. The Majority Of HydroCArbon Impacted Soil Onsite Was ExCAvated During The 2000 Ust Removal And Over-ExCAvation. In 2000, Maximum Onsite Residual Concentrations Of Petroleum HydroCArbons In Soil Were Detected In A Western Sidewall Sample Sw-1-4 (4 Fbg) At 2,100 Mg/Kg Tphg, 11 Mg/Kg Benzene And 47 Mg/Kg Ethylbenzene. Not Counting This Sample, The Maximum Concentrations Remaining In Soil Confirmation Samples Are 360 Ppm Of Tph-G, 250 Ppm Of Tph-D, 3.5 Ppm Of Benzene, 1.8 Ppm Of Toluene, 11 Ppm Of Ethylbenzene, 24 Ppm Of Xylenes, And 6.7 Ppm Of Mtbe. Maximum Concentrations Of HydroCArbons Detected Offsite In The Marsh Fill Area Were Also ExCAvated. Overall, All Constituents Of Concern Exhibit Decreasing Concentration Trends. Analytic Results From The First Quarter 2008 Groundwater Monitoring Event IndiCAte That Petroleum HydroCArbons In Groundwater Are Adequately Defined By Onsite And Offsite Wells And Grab Groundwater Samples. As Described By The January 5, 1996 Rwqcb Memorandum, Regional Board Supplemental Instructions To State Water Board, Interim Guidance On Required Cleanup At Low-Risk Fuel Sites, A Low-Risk Groundwater CAse Has The Following General Characteristics: ? The Leak Has Stopped And Ongoing Sources, Including Free Product, Have Been Removed Or Remediated; ? The Site Has Been Adequately Characterized; ? The Dissolved HydroCArbon Plume Is Not Migrating; ? No Water Wells, Deeper Drinking Water Aquifers, Surface Water Or Other Sensitive Receptors Are Likely To Be Impacted; And ? The Site Presents No SignifiCAnt Risk To Human Health Or The Environment Each Of The Low-Risk Groundwater CAse Characteristics, As They Relate To The Site Have Been Met And Are Discussed In More Detail In The 7/20/09 Site Closure Summary Form. All Hard Copies Uploaded To Gt. 09/14/2015 Tank Closure York Cleaners 31 Miller Avenue Mill Valley CA Tetrachloroethylene (PCE) Other Groundwater (Uses Other Than Drinking Water), Soil, Soil Vapor The Subject Property Is Located In A Mixed Commercial And Residential Area Of Mill Valley. The Property Is Bordered With Residential Dwellings To The South And East And Commercial Properties To The North And West. The Subject Site Has Been Occupied By A Dry Cleaning Facility Since Approximately 1961. York Cleaners Currently Operates A PCE-Based Closed-Loop Dry Cleaning Machine Which Was Installed In Approximately 1998. Environmental Investigations In May 2007, June 2007, February 2008, And July 2008, Found Concentrations Of PCE And Some Of Its Breakdown Products In Soil Samples (Maximum Concentrations Of 1.70 Mg/Kg Of PCE), In Groundwater Samples (Maximum Concentrations Of 65 Ug/L Or Ppb Of PCE), And In Soil Gas Samples (Maximum Concentrations Of 310 Ug/L Or 310,000 Ug/M3 Of PCE, 4.4 Ug/L Of TCE, 1.9 Ug/L Of Cis-1,2-Dce, And Non-Detectable Concentrations Of Trans-1,2-Dce And Vinyl Chloride). The PCE And TCE Soil Gas Concentrations Exceed Our Commercial Environmental Screening Levels (Esls). In Addition, A Video Inspection Of The Sanitary Sewers And A Five Day Soil Vapor Extraction (Sve) Pilot Study Were Conducted In July 2008. A Sve System Operation Operated From 11/30/09 Till 9/27/11. Site Assessment/Site Investigation, Subsurface Monitoring Subsurface Investigation Chevron 90 Madera Blvd Corte Madera CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Best Buy 632 Irwin St. San Rafael CA Diesel, Waste Oil / Motor / Hydraulic / LubriCAting, * Metals Other Groundwater (Uses Other Than Drinking Water), Soil Currently An Operating Retail Giant, Best Buy, Operates A 35,000 Square-Foot 'Big-Box' Store On The Site, Along With Expansive Paved Parking, Driveways, And Open Ground With Some LandsCAping. Formerly Used By Aluminum Aircraft Parts Manufacturer (Bergman Manufacturing) From The 1960s Till 1972. Metal And Petroleum HydroCArbon Contamination Has Been Identified On Site. AnalytiCAl Sampling Of Soil And Groundwater Began In 2003-04 Finding Elevated Levels Of Recoverable Petroleum HydroCArbons In Soil. Remediation Efforts Started In Dec 2005, And Continue Currently (2015). Other Means, Property Sale/Transaction During Development Other Means Old Facility Torn Down Corte Madera Pump Station Unknown Northwestern Corte Madera CA Diesel Soil Tank Closure Bellam Mini Storage 24 Bellam Blvd San Rafael CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Fomer UnoCAl #4853 86 Medway San Rafael CA Benzene, Gasoline Other Groundwater (Uses Other Than Drinking Water) Received A Letter From Pac Bell 9/14/79 Inquiring About A Leak They Investigated And Discovered About Mid-March 1979. A Leak Was Repaired On 5/9/1979. Repair Product Piping Unleaded Dispenser Was Removed And A Swing Joint Repaired. Nike Battery 93, Sf (J09CA094400) - Aoi 4 S-216 Administrative Area 290 Smith Ranch Rd San Rafael CA Total Petroleum HydroCArbons (Tph), Xylene Soil The Ust And Associated Appurtenances Were Removed On 5 January 1996 By Cky, Inc. At The Time Of Removal, The Tank Was Almost Full With Diesel Fuel. The Piping And Tank Were Flushed With Water From A High-Pressure Washer And Transported Off-Site To Be Disposed Of. Dime- And Quarter-Sized Holes Were Observed On The Tank. Stained Soil, With A HydroCArbon Odor, Was Found At The Walls And The Bottom Of The ExCAvation. ExCAvated Soil Was Placed On Visqueen Plastic Sheeting And Covered With Visqueen Until It Was Hauled Off-Site On 22 June 1996. At The Time Of The Tank Removal, One Confirmatory Soil Sample And One Groundwater Sample Were Collected, Both From The Bottom Of The Ust ExCAvation Pit. Both Samples Were Analyzed For Tph-D Using Modified Environmental Protection Agency (Epa) Method 8015 And For Btex Using Epa Method 8020. Soil Sample Results (Appendix F) IndiCAted Concentrations Of 7,000 Ppm Tph-D, No Benzene, 500 Ppb Toluene, 760 Ppb Ethylbenzene, And 2,800 Ppb Total Xylenes. Groundwater Was Encountered At 5 To 6 Feet Below Ground Surface (Bgs) In The ExCAvation Pit At The Time Of Removal. The Groundwater Sample Results Had Concentrations Of Tph-D At 2,600 Ppb And Were Non-Detect For Btex. Water In The ExCAvation Pit Was Removed With A Vacuum Truck On 24 June 1996. After Water Removal, Approximately Two Cubic Yards Of Mud Were Removed And Added To The Existing Soil Stockpile For Off-Site Disposal. The ExCAvation Was Backfilled With Approximately 2 Feet Of Imported Clean Pea Gravel At The Base, Lined With Visqueen, Filled To 6 Inches Below Grade With Imported Soil, And Covered With Topsoil From The Nearby Area To Match The Existing Grade. Facility Inspection, Tank Closure Close And Remove Tank, Remove Contents Novato Sanitary District 500 Davidson St Novato CA Diesel Other Groundwater (Uses Other Than Drinking Water) The Novato Sanitary District?S (Nsd?S) Wastewater Treatment Facility Occupies The Site. On 9/8/98, During The Diesel Ust Removal Project, A Fuel Leak Was Observed. Impacted Soil Was Removed To 13.5 Ft Bgs. Free Product (Fp) Was Observed On The Groundwater (Gw). On 9/11/98, 250 Gallons Of Impacted Gw Along With Fp Were Pumped From The ExCAvation. A Product Extraction Well (Pe-1) Was Installed In The ExCAvation. In 8/99, Seven Borings Were Installed. Soil Samples From Two Of The Borings Contained SignifiCAnt Tph-D (Sb-1 & Sb-3 With 2,100 & 1,300 Mg/Kg). Fp Was Observed In Pe-1 And Sb-3. A Sensitive Receptor Survey On 1/14/00 IndiCAted No Vapors Were Detected In Accessible Underground Vaults & No Water Wells Were Identified Within 500 Feet Of The Site. From 10/99 To 9/03, 4870 Gallons Of Impacted Gw Was Extracted From Pe-1 Along With 7 Gallons Of Fp. Concentrations Of Tph-D In Pe-1 Show A SignifiCAnt Reduction After 9/03. Three Monitoring Wells (Mws) Were Installed In 8/06. From 7/07 Thru 5/08, 640 Cubic Yards Of Soil Were Removed To A Landfill As Part Of The Nsd?S Sewer System Upgrade Project. The ExCAvation Covered Sb-1, Sb-3, Pe-1, & The Ust. Soil Samples From The Final ExCAvation Limits Contained A Maximum Of 1,800 Mg/Kg Of Tph-D. The ExCAvation Was Bored Laterally From The E/Se Using A Microtunnelling Auger. The Auger Has A Diameter Of 64 Inches And The Bottom Of The Microtunnel Was 18 Ft Bgs. It Is Likely That The Micortunnelling Removed Most Of The Residual Impacted Soil In This Area. On 7/15/08, A Minor Spill Of Diesel Occurred Inside The Sw Wet Weather Sump. The Sump Is 3 Ft X 3 Ft X 18 Inches Deep Poly Container Surrounded By A Concrete Vault With A Sand Bottom. A Small Amount Of Diesel Spilled Into The Sand Between The Sump And The Walls Of The Concrete Vault. On 7/15/08, Two Samples Of The Sandy Material At The Bottom Of The Vault Contained 54,000 & 57,000 Mg/Kg Of Tph-D. The Concrete And Soil Down To Two Ft Below The Bottom Of The Vault Was Removed In 2/09. Soil Was Removed To The Extent PractiCAble, Leaving Some Impacted Soil Around And Below The Numerous Piping In The Area. 2-3 Cubic Yards Of Soil Were Removed. Soil Samples From The Bottom Of This ExCAvation Contained A Maximum Of 4,400 Mg/Kg Of Tph-D. Based On The Following, CAse Closure For This Site As A Low Risk CAse Is Considered To Be Appropriate: (1) The Primary Source (The Diesel Ust) Has Been Removed. Fp Has Also Been Removed To The Extent PractiCAble. The Secondary Sources, The Diesel-Impacted Soils, Have Been Removed To The Extent PractiCAble In Both The Ust Areas And The Sw Wet Weather Sump Area. Benzene Was Not Detected In Soil Above Its Esl During The 2007and 2008 Source Removal Activities; (2) The Site Has Been Adequately Characterized; (3) The Soil In The Areas Where SignifiCAnt Concentrations Of Tph-D In Gw Were Detected (Including Sb-3 & Pe-1) Were Over-ExCAvated. No Post-ExCAvation Groundwater Samples Were Collected For Analysis But The Concentration Of Tph-D In Gw In The Area Of Pe-1 Should Be SignifiCAntly Less Than Before. Non-Detectable Concentrations In Mw-1 Through Mw-3 During Each Sample Event IndiCAtes That The Gw Tph-D Plume Is Of Limited Extent, Generally Confined To The Backfill Material Of Effluent Trunk Line 2 And Is Not Migrating Offsite. Low Permeability Native Soils, And A Low Production Shallow Water Producing Zone Constrain Plume Migration, And Shallow Bedrock Constrains The VertiCAl Migration Of The Plume. Also, Btex Compounds Were Not Detected In Water Collected From Destroyed Pe-1; (4) The Site Is A Sewage Treatment Facility And Is Expected To Stay That Way In The Foreseeable Future. And There Are No Private, Commercial Or Municipal Water-Supply Wells Within 500 Ft Of The Site; And (5) The Known Current Residual Concentrations In The Soil And Groundwater Do Not Represent A SignifiCAnt Current Or Future Public Health, EcologiCAl, And Water Resources Threat Under The Current Land Use Scenario. Other Means Shell 798 Redwood Hwy Mill Valley CA Waste Oil / Motor / Hydraulic / LubriCAting Other Groundwater (Uses Other Than Drinking Water) Tank Closure Marshall Boat Works 19180 State Route One Marshall CA Arsenic, Copper, Lead, Mercury (Elemental), Other Metal, Zinc Contaminated Surface / Structure, Other Groundwater (Uses Other Than Drinking Water), Sediments, Soil, Surface Water Propper Property 140 Bella Vista Belvedere CA Heating Oil / Fuel Oil Under Investigation Tank Closure Miracle Mile Partners 1942 4th St San Rafael CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Exxon 595 Redwood Hwy Mill Valley CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure San Rafael Airport 397 Smith Ranch Rd. San Rafael CA Aviation Other Groundwater (Uses Other Than Drinking Water) Evidence Of Past Spills Observed Prior To 2/14/2001. Reported To Fire Dept. Prior To This Date. Drakes Highway Garage 12786 Sir Francis Drake Blvd Inverness CA Gasoline Other Groundwater (Uses Other Than Drinking Water) The Site Began Operating As A Service Station In 1914 Until December 1998. A Perennial Stream Runs Along The Northwest Boundary Of The Site. Tomales Bay, Part Of The Gulf Of Farallones National Marine Sanctuary, Is Located Less Than 2,000 Feet North And East Of The Site. The Main Garage Is A Two-Story Building That Has Been Partially Converted Into Office Space And Is Also Used As A Machine Shop For The Maintenance And Housing Of Medium Duty Equipment. Six USTs Along With The Dispensers And Product Piping Were Removed In Sept. 1999. Soil Samples Collected During The Ust Removal Contained Up To 13,300 Mg/Kg Of Tph-G. Eight Borings And Seven Temporary Monitoring Wells (Mws) Were Installed In April 2002. Ground Water From The Monitoring Wells Contained Up To 110,000 µg/L Of Tph-G, 7,300 µg/L Of Tph-D, 7,800 µg/L Of Benzene, And 610 µg/L Of Mtbe. Remedial Soil ExCAvation Was Conducted At The Site. Soil Confirmation Samples Contained Up To 660 Mg/Kg Of Tph-G And 730 Mg/Kg Of Tph-D. The Soil Confirmation Samples Were Not Analyzed For Benzene And Mtbe. In February 2005, Four Permanent Mws At A Depth Of 20ft Bgs, Were Installed, Including One Between The ExCAvation And The Perennial Stream. Groundwater Samples Were Collected From All 4 Mws On A Quarterly Basis Over The Course Of The Following Year. Groundwater From These 4 Mws Contained A Maximum Of 4,600 µg/L Of Tph-D And 11 Ug/L Of Mtbe. Tph-G And Benzene Were Not Detected In These Mws. In 2012, Adjacent To Each Mw, A Geoprobe Hydro Punch Was Advanced Into The Shallow Gw. Gw Samples Collected Contained A Maximum Of 27 µg/L Of Tph-D Using The SiliCA Gel Clean Up Procedure And Non-Detectable (Nd) Concentration Of Tph-G, Benzene, Ethylbenzene, Toluene, Xylenes, And Mtbe. Low-Threat Closure Criteria The Site Meets The Criteria For Low Threat Closure In The State?S Low Threat Closure Policy Based On The Following: ? The Site Is Located Within The Service Area Of Marin Municipal Water District. ? The Site?S Unauthorized Release Has Been Characterized As A Release Of Only Petroleum Based Products. ? The ?Site?S Primary Release Has Been Stopped. ? No Petroleum Free Product Has Been Observed In Any Of The Wells Since Groundwater Monitoring Began. ? Environmental Reports For The Site Contain The Elements Of A Conceptual Site Model That Assesses The Nature, Extent, And Mobility Of The Release. ? The Removal Of 539 Tons Of Petroleum Contaminated Soil Was Removed At The Site Along With Purging The USTs Pit Of 11,200 Gallons Of Groundwater. Remaining HydroCArbon Concentrations In Soil And Groundwater Are Low Or Nd And Are Expected To Continue To Degrade. Therefore, Secondary Source Mass Is Considered To Have Been Removed. ? Mtbe Has Been Tested For In Soil And Groundwater. The AnalytiCAl Results Were Reported. ? Conditions Satisfying The Definition Of A Nuisance As Defined In Water Code Section 13050 Do Not Exist At The Site. ? Groundwater - The Site Satisfies Class 1 Of The Groundwater Specific Criteria. The Petroleum HydroCArbon Plume Has A Predicted Maximum Length Of Less Than 100 Feet, No Petroleum Phase Free Product Has Been Reported At The Site, And There Are No Water Supply Wells Within 250 Feet Of The Site. ? Vapor Intrusion To Indoor Air ? The Site Satisfies Scenario3a Of The Vapor Intrusion Specific Criteria. Benzene Concentration In Groundwater Is Less Than 100 µg/L. Benzene Concentrations In Groundwater Has Been Below Detection Limits Since 2005 And The Total Tph (Tph-G And Tph-D Combined) Is Expected To Be Less Than 100 Mg/Kg Within The Top Five Feet Of Soil. ? Direct Contact And Outdoor Air Exposure ? The Regulatory Agency Determined That The Concentrations Of Petroleum Constituents In Soil Will Have No SignifiCAnt Risk Of Adversely Affecting Human Health Via Direct Contact And Outdoor Air Exposure Criteria For Commercial/Industrial Uses. Tank Closure Tomales Fire Station 611 Dillon Beach Rd Tomales CA Gasoline Aquifer Used For Drinking Water Supply, Well Used For Drinking Water Supply The Site Is Located In A Predominately Agricultural Area 0.5 Miles West Downtown Tomales. There Are Residences North And East Of The Site And Open Pasture South And West Of The Site. The Residences Are Serviced By Shallow Water-Supply Wells. The Tomales Fire Station (Tfs) Occupy The Site. There Is A Steep Hillside Which Slopes Downward Toward The South Adjacent To The Southern Edge Of The Site. A Somewhat Gentler Hillside Slopes To The North Toward A South-Draining Gully. This Gully Drains Into A Creek That Is Located Approximately 500 Ft South Of The Site And Flows Toward The Southeast And Eventually Joins Keyes Creek. Keyes Creek Flows Into Walker Creek, Which Drains Into Tomales Bay. The Tfs Is Serviced By A Septic System And Water-Supply Well Ww-3. Ww-3 Is Not Used For Potable Water And Was Installed In August 1998. Prior To The Installation Of Ww-3, Site Water Was Supplied By Ww-1. Ww-1 Was Destroyed In November 1998 BeCAuse Gasoline Had Been Detected In This Well. Leakage From The On-Site Gasoline Ust Or The Piping System Was First Discovered In 1976 When Ww-1 Had Noticeable Gasoline Smell. Testing Of The Water From Ww-1 Detected Up To 6,200 Ug/L (Or Ppb) Of Tphg And 517 Ppb Of Benzene. On 7/25/97 The Gasoline Ust Was Removed From The Site. Based On The Following, CAse Closure For This Site Is Considered To Be Appropriate For Closure As A Low Risk Groundwater Site: (1) The Primary Source (One 1000 Gallon Gasoline Ust) Has Been Removed From The Site. Approximately 530 Cubic Yards Of Impacted Soils Were Over- ExCAvated And Transported Offsite; Fhc-Impacted Soils Have Been Removed To The Extent PractiCAble. Approximately Five Years Of Ozone Injection Has Likely Remediated Most Of The Residual Soil And Groundwater Contamination At The Site. (2) The Site Has Been Adequately Characterized. Sensitive Receptors And Migration Pathways That Could Be Impacted By The Release Have Been Identified And Evaluated. 3) The Dissolved Plume (Tphg And Btex), Is Stable Or Decreasing, And Is LoCAlized To The Immediate Vicinity Of Injection Well Sp-3 Where Concentrations Of Tphg, Benzene And 1,2-DCA Exceed Their Respective Esls. (4) No Existing Water Wells, Deeper Drinking Water Aquifers, Surface Water, Or Other Sensitive Receptors Have Been Impacted Or Are Likely To Be Impacted From The Release From The Former Ust. The On-Site And Off-Site Water Wells Within 500 Feet Of The Former Ust Have Been Tested Many Times And Found To Be Not Impacted By Fhcs. BeCAuse The Wilson Grove Formation Overlies Metamorphic Rocks Of The FrancisCAn Complex At 17 ? 20 Ft Bgs, Deeper Aquifers Are Not Present Or Likely To Be Impacted By The Release. Appropriate Signs Have Been Posted In Conspicuous LoCAtions To Prevent Any Potable Uses Of Water From Ww-3. 5) There Is Not A SignifiCAnt Risk To Human Health Or The Environment. There May Be A Small Risk To Human Health That Would Be Easily Manageable If ExCAvations Extend To Below 15 To 20 Ft Bgs In The Near Vicinity Of The LoCAtion Of The Sp-3 And The Former Ust LoCAtion And Mw-4. The Residual Impacted Soil In These LoCAtions Has Likely Been Greatly Reduced As This Is Within The Depth Range Of Groundwater Into Which Ozone Has Been Injected. Additionally, Residual Impacted Soils Reported In The ExCAvation Confirmation Samples, Primarily From S-9 And S-10 Have Also Likely Been Remediated. The Potential Risk Could Be Mitigated By Preparing A Soil And Groundwater Management Plan (Sgmp). The Sgmp Would Describe Procedures To Notify The Appropriate Regulatory Agencies, Protect Worker?S Health, And Manage Impacted Soil And/Or Groundwater If It Is Encountered. (6) Btex Is Absent From Soil And Groundwater In Wells Around The Site Building, Precluding A Potential Vapor Intrusion Problem. (7) The Residual Concentrations In The Soil And Groundwater Apparently Do Not Represent A Current Or Future Public Health, EcologiCAl, And Water Resources Threat. Tank Closure San Rafael City Schools Maintenance Facility 38 Union St. San Rafael CA Benzene, Toluene, Gasoline Indoor Air, Other Groundwater (Uses Other Than Drinking Water), Soil, Soil Vapor Free Product Found In 1997, Soil ExCAvations In 1997 & 1998. No Record Of Groundwater Sampling. Orp Injections In Oct. 2015 To Lower Source Area Concentrations. Will Collect Confirmation Samples. Facility Inspection, Visual Found Free Product In Soil & Gorundwater Close And Remove Tank Ust Removed Chevron 1103 Bridgeway Blvd Sausalito CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Bayview Business Park- Horst Hanf Landfill 22 PeliCAn Way San Rafael CA Site Is Closed Landfill With Development. Site Is Regulated By CAl Recycle And Lea - See CAl Recycle Swis # 21-Aa- 0047 For More Info George Roth 1991 Trust 879 Sweetser Avenue Novato CA Tetrachloroethylene (PCE), Diesel, Other Petroleum, Total Petroleum HydroCArbons (Tph), Waste Oil / Motor / Hydraulic / LubriCAting Other Groundwater (Uses Other Than Drinking Water), Soil Since 1945, The Subject Property Has Operated As An Auto Repair Facility. A Variety Of Hazardous Materials Have Been Managed Onsite Including Virgin And Waste Oil. Site Has Had Some Characterization And Two Rounds Of ExCAvations Have Been Completed. Seven Soil And Groundwater Borings Installed In June 2000. Clay And Sandy Clay To 14 Feet Then Clayey Gravel And Clayey Sand From 14 ? 18 Feet (Total Depth Explored). Groundwater Encountered At Approx. 12-14 Feet Bgs. After Over-ExCAvation Only Two LoCAtions Over Esls: Sample E-S2 (Center Of East Sidewall) Had 970 Mg/Kg Tph-Motor Oil And 190 Mg/Kg Tph-Diesel; Soil Boring B-3 Had 350 Mg/Kg Tph-Diesel At 2.0 Feet Bgs. Rlj Incorporation 20 Bellam Blvd San Rafael CA Waste Oil / Motor / Hydraulic / LubriCAting Soil Tank Closure Foodmart 709 5th Ave San Rafael CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Ross Valley Fire Department 150 Butterfield Rd San Anselmo CA Diesel Aquifer Used For Drinking Water Supply, Other Groundwater (Uses Other Than Drinking Water), Soil Two USTs Were Removed From The Eastern Driveway Of Fire Station #20 In August 1990. The Approximate LoCAtions Of The Tanks Are Shown In The Site Plan. The 550 Gallon Gasoline Ust Was Reported To Be In Good Condition During Removal. Holes Were Reported In The 350 Gallon Diesel Ust. Soil Samples Were Collected At The Northern Ends Of The Ust ExCAvations For Each Tank (S-1 For The Diesel Ust And S-2 For The Gasoline Ust) At A Depth Of Approximately 6.5 Feet Below The Ground Surface (Bgs). Tph As Diesel Was Detected In Sample S-1 At A Concentration Of 4,500 Millgrams/Kilogram (Mg/Kg). Tph As Gasoline And Benzene Were Not Detected At Either LoCAtion. One Soil Boring Was Completed In 1998 Near The Former Diesel Dispenser LoCAtion. Soil Samples Were Collected At Depths Of 5 Feet, 8 Feet, And 12 Feet Bgs (Samples Were Designated S5, S8, And S12) For Analyses. No Petroleum HydroCArbons Were Detected In Any Of The Soil Samples. No Groundwater Samples Were Collected During This Investigation. Two Soil Borings (Sb-1 And Sb-2) Were Completed In The Vicinity Of The Former USTs In March 2010. These LoCAtions Are In Close Proximity To The Former Tank And Dispenser LoCAtions And Located Between The Former USTs And Sleepy Hollow Creek. The Water Table Was Estimated At Approximately 10 To 12 Feet Below The Ground Surface By The Driller. Two Soil Samples And A Groundwater Sample Were Collected From Each Boring In 2010. No Petroleum HydroCArbons (Tph-G, Tph-D, Btex, And Mtbe) Were Detected In Any Of The Soil Or Groundwater Samples Collected In 1998 And 2010. The Lack Of Petroleum HydroCArbon Detections In Soil And Groundwater IndiCAte That There Has Not Been A SignifiCAnt Release From The Former USTs At The Site. Based On The Following, CAse Closure For This Site Is Considered To Be Appropriate: (1) The Site Has Been Adequately Investigated; (2) The Primary Source (The Two USTs That Formerly Occupied This Site) Were Removed In 1990; (3) The Non-Detect Or Low Concentrations Of Petroleum Related HydroCArbons In Soil And Groundwater In Follow-Up Investigations IndiCAte That There Has Not Been A SignifiCAnt Release From The Former USTs At The Site And That Any Residual Pollution Is Minimal; And (4) The Residual Concentrations In The Soil And Groundwater Do Not Represent A Current Or Future Public Health, EcologiCAl, And Water Resources Threat. Tank Closure Marin Humane Society 171 Bel Marin Keys Blvd Novato CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Viacom CAblevision 1111 Andersen Dr San Rafael CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Arco 233 Tamalpais Dr Corte Madera CA Waste Oil / Motor / Hydraulic / LubriCAting Other Groundwater (Uses Other Than Drinking Water) Tank Closure Guasco Market 100 Center Blvd San Anselmo CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure North Bay Cleaners, Triangle Plaza 1557 - 1559 South Novato Blvd. Novato CA Tetrachloroethylene (PCE), Trichloroethylene (TCE), Vinyl Chloride Other Groundwater (Uses Other Than Drinking Water), Soil, Soil Vapor North Bay Cleaners Is An Active Dry Cleaner Located In The Southern-Most Commercial Unit In The Triangle Plaza Shopping Center. An Environmental Investigation Conducted At The Site In November 2006 Found Concentrations Of The Dry Cleaning Solvent Tetrachloroethylene (PCE) And Some Of Its Breakdown Products In Grab Groundwater Samples At Concentrations Up To 160 Ppb Of PCE, 360 Ppb Of Trichloroethylene (TCE), 760 Ppb Of Cis-1,2-Dichloroethylene (Cis-1,2-Dce), And 5.0 Ppb Of Vinyl Chloride. These Concentrations SignifiCAntly Exceed The CAlifornia Maximum Contaminant Levels (Mcls) For Drinking Water. Groundwater Flow Direction At A Gas Station Located About 330 Feet From The Subject Site Is To The North/Northeast. Soil Gas Investigations Conducted In May And July 2007 Found Several Volatile Organic Compounds (Vocs) That Exceeded Our Environmental Screening Levels (Esls) For Potential Vapor Intrusion Concerns For Commercial/Industrial Buildings. Vinyl Chloride Was Detected In Soil Gas During This Investigation At Concentrations Up To 78 Ug/L (Over 700 Times Our Esl Value). The Highest Vinyl Chloride Concentration Was Detected In Sample Env-8, Located Near The Southern Boundary Of The Property. A Subsequent Investigation On October 22, 2007, Included Collecting Soil Gas Samples From Three LoCAtions South Of Env-8, And Groundwater Samples From Three LoCAtions Along The Sewer Line East Of The Dry Cleaner. The Voc Concentrations In Soil Gas Samples South Of Env-8 Were Below Detection Limits For All Compounds IndiCAting That The Soil Gas Plume Has Not Migrated Across Center Road Into An Area Containing Residential Dwellings. The Soil Gas Plume Appears To Be Confined To The Southeastern Corner Of The Dry Cleaner And Extends Less Than 80 Feet To The South (In The Area Of The Parking Lot And The Northern Part Of Center Road). Four Groundwater Monitoring Wells And One Permanent Vapor Monitoring Well Were Installed At The Site In July 2008. Site Assessment/Site Investigation, Subsurface Monitoring Pollution Discovered During Phase Ii Grab Groundwater Investigation. Change Operating Procedures Thissell Property 2 Garden Rd Ross CA Heating Oil / Fuel Oil Soil Tank Closure Big 4 Rents Inc 875 Olive Ave Novato CA Diesel Other Groundwater (Uses Other Than Drinking Water) Subsurface Monitoring Cr Fedrick Inc 320 Deer Island Ln Novato CA Waste Oil / Motor / Hydraulic / LubriCAting Other Groundwater (Uses Other Than Drinking Water) Tank Closure Novato Fire Protection Dist 7025 Redwood Blvd Novato CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Novato Disposal Services Inc 752 Mcclay Rd Novato CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure San Quentin State Prison I-580 @ Main St San Quentin CA Tetrachloroethylene (PCE), Trichloroethylene (TCE), Vinyl Chloride Other Groundwater (Uses Other Than Drinking Water), Soil, Soil Vapor The Dry Cleaner At San Quentin State Prison Is Housed In Building 39. Building 39 Consist Of Three Separate Buildings: The Dry Cleaner Building, The Labcon Building, And The Mattress Factory Building. Previous Investigations In The Vicinity Of Building 39 IndiCAte That Soil And Groundwater Have Been Impacted By Stoddard Solvent And PCE And Their Breakdown Products. Four Monitoring Wells, Numerous Temporary Soil Borings, And Four Permanent Sub-Slab Soil Vapor Monitoring Points Have Been Installed Beneath And In The Vicinity Of Building 39. In Addition, Three Ambient Air Samples Were Collected Inside Building 39 And One Ambient Air Sample Collected Outside Building 39 As A Background Sample. In A Letter Dated 12/12/08, The Water Board Concur That Monitored Natural Attenuation As The Remedial Strategy For The Site Is The Appropriate Strategy. HistoriCAl And Current Groundwater AnalytiCAl Data IndiCAtes That Biodegradation Of The Vocs In Groundwater Has And Is Continuing To Occur. The Concentrations Of PCE And TCE Has Decreased To Low Concentration Or Are Below Detection Limits While Cis-1,2-Dce, 1,1,1-TCA, And Vinyl Chloride Concentrations Is Either Increasing Or Has Stabilized. There Is Also AnalytiCAl Evidence That The Vinyl Chloride Is Breaking Down To Methane And Ethane. Analysis Of The Groundwater For Natural Attenuation Parameters Confirms That The Subsurface Environment In The Vicinity Of The Building 39 Is Conductive For The Continuation Of Biodegradation Of Vocs. Elevated Chlorinated Solvent Concentrations In Sub-Slab Soil Vapor Is Addressed As A PreCAution To Mitigate Any Concern About Vapor Intrusion Into Building 39. Groundwater Monitoring, Site Assessment/Site Investigation, Subsurface Monitoring Change Operating Procedures Chevron #-6621 475 3rd St San Rafael CA Waste Oil / Motor / Hydraulic / LubriCAting Other Groundwater (Uses Other Than Drinking Water) Tank Closure Us Army Corps Of Engineers 2100 Bridgeway Blvd Sausalito CA Diesel Well Used For Drinking Water Supply Tank Closure Black Point Antenna Field - Facility Wide Stonetree Lane Novato CA Dioxin / Furans, Polychlorinated Biphenyls (Pcbs), Diesel, Heating Oil / Fuel Oil Soil The Black Point CommuniCAtion Facility Annex Site Is A Formerly Used Department Of Defense Property Which Occupies 135 Acres Located Approximately 5 Miles North Of Hamilton Army Airfield. The Site Is Also Known As The Black Point Antenna Field Or The Black Point Transmitter Field. In May 1939, The Black Point Antenna Facility Occupied 27 Acres And Provided CommuniCAtions Facilities For Hamilton Army Airfield. In October 1957 An Additional 108 Acres Was Acquired, Bringing The Total To 135 Acres. Around The Same Time, Hamilton Army Airfield Acquired Land Immediately Adjacent To The Main Airfield For Construction Of An Antenna Field, Currently Known As The Hamilton North Antenna Field. Information Suggests The Site Was Then Used By The 552nd Airborne Early Warning And Control Group (Aewcg) Stationed At Mcclellan Afb. The Aewcg Flew Radar Equipped Aircraft On Missions Between Mcclellan Afb And Korea, Japan, And Southeast Asia. The Black Point Property Was Transferred By Quitclaim Deed To The State Of CAlifornia Lands Commission On January 17, 1985. From September 1985 To March 1994 The Buildings Were Used By The Living History Center For Workshops, Prop FabriCAtion, And Storage For The Marin County Renaissance Fair. On July 1, 1986, The State Lands Commission Issued A Lease For Grazing That Will Be In Effect Until June 31, 2006. In 2005, A Pa/Si Work Plan Was Developed In Support Of The Restoration Plans Being Developed By The Coastal Conservancy, CAlifornia State Water Resources Control Board, U.S. Fish And Wildlife Service, Marin Audubon Society, And Others For The Site. These Entities Plan To Restore The Intertidal Function Of The Site Area, Thus Reintroducing Wildlife And Fish Habitat Lost When The Land Was Diked From Tidal Influence. The Site Is Part Of A Larger Land Parcel That Was Diked To Allow For Hay Agriculture And CAttle Grazing. BeCAuse Historic Practices At The Site May Have Included The Use Of Compounds (E.G., Petroleum HydroCArbons, Lead-Based Paint, Polychlorinated Biphenyls [Pcbs]) That May Be Harmful To EcologiCAl Receptors, The Pa/Si Work Plan Included A Sampling Plan To Assess The Presence And Concentration Of The Contaminants. A Site Inspection Work Plan (July 2006) Detailed Removal And Investigation Actions. The Results Were Released In The Draft Final Underground & Above Ground Fuel Storage Tank & Transformer Removal Report (May 2008). Removal Actions Included The Removal And Disposal Of Above Ground Fuel Storage Tanks And Underground Storage Tanks Consisting Of One 1,000-Gallon Ast At Building 1506; One 250-Gallon (Or Less) Ast At Building 1501; One 1,000-Gallon Ust At Building 1501; One 500-Gallon Ust At Building 1501; And One 288-Gallon Propane Tank (Above Ground) From Building 1506. Removal Actions Also Included The Removal And Disposal Of Dielectric Fluid And Transformer Pots. The Dtsc And Rwqcb Have Provided Comments And Determined That Further Action Is Required. Site Assessment/Site Investigation Close And Remove Tank Tanks Removed 9/26-27/2006 Piro Property 240 Elizabeth Wy San Rafael CA Diesel Under Investigation Tank Closure Novato Fire Station #64 319 Enfrente Road Novato CA Diesel, Total Petroleum HydroCArbons (Tph) Other Groundwater (Uses Other Than Drinking Water), Soil, Under Investigation The Subject Property (Site) Is An Operating Fire Station That Has Been Under Renovation (Novato Fire Protection District, Former Station No. 64) On Approximately 0.62 Acres Near Ignacio Blvd And Highway 101 (Redwood Hwy) In Marin County, CAlifornia. In 1989 Two (2) 1,000-Gal Underground Storage Tanks (USTs) Were Removed From The Northern Portion Of The Site. One Ust Stored Diesel And The Other Gasoline. Petroleum HydroCArbon Impacted Soil Was Discovered During Demolition Activities At Concentrations Of Up To 7,280 Mg/Kg Of Diesel Range Organics (Dro) And 166 Mg/Kg Gasoline Range Organics (Gro). Groundwater Samples IndiCAted Non-Detect Or Below Regulatory Limits (Rls) For Dro Or Gro Concentrations. Lead (Metal) Was Also Not Detected In Soil Samples At Concentrations Exceeding Rls. Three (3) Operating Gas Stations Are Within 700 Feet Of The Site And Are Closed CAses On The Leaking Underground Storage Tank (Lust) List. Current Remedial Activities Include Soil Management With Stockpiling, ExCAvating, And On-Site Soil Re-Use. During Grading Activities Johnston Trust Property 150 Perth Wy Inverness CA Heating Oil / Fuel Oil Other Groundwater (Uses Other Than Drinking Water) Tank Closure Hamilton Aaf (Gsa, Incl. N. Antenna Field) - North Antenna Field 1 Burma Road Novato CA Mill Valley Corporation Yard 450 SyCAmore Avenue Mill Valley CA Waste Oil / Motor / Hydraulic / LubriCAting Other Groundwater (Uses Other Than Drinking Water) The Site Contains Primarily The City Of Mill Valley Sewer Treatment Plant. The Site Is Situated On Filled Land On The West Side Of Pickleweed Inlet, A Tributary Of Richardson Bay. The Marin County Department Of Public Works Corporation Yard Occupies The Eastern Part Of The Site. On November 23, 2005, One 550-Gallon Ust For Waste Oil Was Removed And Disposed Of. No Obvious Holes Were Observed In The Ust During Removal Activities. Soil Samples Collected From The Ust ExCAvation Contained Up To 4,200 Milligrams Per Kilogram (Mg/Kg) Total Petroleum HydroCArbons (Tph) As Diesel (D), 27,000 Mg/Kg Tph As Motor Oil (Mo), And 61,000 Mg/Kg Total Recoverable Petroleum HydroCArbons (Trph). Several Luft 5 Metals And CAm 17 Metals Were Also Detected In The Soil Samples. A Grab- Groundwater Sample Collected From The ExCAvation Contained Tph As Gasoline (G), Tphd, Tphmo And Trph At Concentrations Of 100 Micrograms Per Liter (µg/L), 14,000 µg/L, 67,000 µg/L And 62,000 µg/L, Respectively. Several Volatile Organic Compounds (Vocs) And Luft 5 Metals Were Also Detected In The Grab-Groundwater Sample. On September 4, 2007 Edd Clark & Associates, Inc. (ECA) Advanced 4 Exploratory Soil Borings. Minor Concentrations Of Oil & Grease (O&G) Were Detected In Three Soil Samples (190 Mg/Kg Maximum), None Of Which Exceeded The 500 Mg/Kg Environmental Screening Level (Esl) For Tph- Residual-Fuels In Shallow Residential Soils Where Groundwater Is Not Considered A Source Of Drinking Water. Total Chromium, Lead, Nickel And Zinc Were Detected In All The Soil Samples At Concentrations That Were SignifiCAntly Less Than Their Respective Esls. No Detections Of Fuel HydroCArbons (Fhcs), Vocs, Svocs Or Metals Above Their Respective Laboratory Detection Limits Were Reported From The Grab-Groundwater Samples. Groundwater Tds Results Ranged From 3,500 Milligrams Per Liter (Mg/L) To 58,000 Mg/L. These High Tds Results IndiCAtes That Shallow Groundwater Beneath This Site Is Not A Potential Source Of Drinking Water. Based On The Soil And Groundwater Sample AnalytiCAl Results From The September 2007 Soil And Groundwater Investigation, The Extent Of Fhc-Impacted Soil And Groundwater Are Considered To Be Highly LoCAlized And Constrained To Within 10 Ft Of The Former Ust ExCAvation Area. ECA Also Performed A Sensitive Receptor Survey (Srs) For The Site. The Srs Identified The Nearest Sensitive Receptors As The Arroyo Corte Madera Del Presidio (400 Ft South) And Pickleweed Inlet (900 Ft East). No Water Wells Were Identified Within The Search Radius; The Two CAthodic Protection Wells Have Been Grouted And Are Not Potential VertiCAl Migration Pathways For Fhcs. No Vapors Or Other IndiCAtions Of A Release Were Identified During The Srs. Based On The Following, CAse Closure For This Site Is Considered To Be Appropriate: (1) The Primary Source (One 550-Gallon Waste Oil Ust And Ancillary Equipment) Has Been Removed And Surrounding Impacted Soils Were Removed During Ust Removal Activities; (2) The Site Has Been Adequately Investigated And Characterized; (3) No Detections Of Fuel HydroCArbons (Fhcs), Vocs, Semi-Vocs (Svocs) Or Metals Above Their Respective Laboratory Detection Limits Were Reported From The Grab-Groundwater Samples From The Four Borings Advanced; (4) No Water Wells Were Identified During The Srs And The Nearest Surface Water Body Is 400 Ft To The South And Not Likely To Be Impacted; (5) The Groundwater Beneath The Site Is Not Suitable For Drinking (Tds Up To 58,000 Mg/L); (6) Benzene And Mtbe Have Never Been Detected In Soil Or Groundwater Samples Collected From The Site; (7) Residual Impacted Soils And/Or Groundwater Are Very LoCAlized (Within Less Than 10 Ft Of Former Ust) And Do Not Represent A Current Or Future Public Health, EcologiCAl, And Water Resources Threat Under The Current Land Use Scenario. Tank Closure Close And Remove Tank Chevron 458 Miller Ave Mill Valley CA Gasoline Other Groundwater (Uses Other Than Drinking Water) The Subject Site Is Currently An Operating Chevron Station Located At 458 Miller Avenue In Mill Valley, CAlifornia. In Order To Monitor Three Gasoline Underground Gasoline Storage Tanks (USTs), Shallow Groundwater Monitoring Wells M-1 Through M-6 Were Installed On August 5, 1987. On May 12, 1993, The Three USTs Were PhysiCAlly Removed From The Site And Replaced With New USTs. At The Time Of The Tank Removals, Soil Samples And A ?Grab? Groundwater Sample Were Collected From The Tank Pit. In Addition, A Groundwater Sample Was Collected From Monitoring Well M-2. Although The Results Of Laboratory Analysis Of The Tank Pit Soil Samples Were Very Low, The Results Of Laboratory Analysis Of The ?Grab? Groundwater Sample Collected From The Tank Pit IndiCAted A Concentration Of 120,000 µg/L (Ppb) Of Tph-G And 30 µg/L (Ppb) Of Benzene. On June 2- 8, 2009, Monitoring Wells M-1, M-2, M-3, M-4, M-5 And M-6 Were Re-Developed And Sampled. Groundwater Concentrations Of Tph-G, Benzene, And Mtbe Were Very Low (Maximum Of 580 Ppb, 9.4 Ppb, And 1.5 Ppb). In Addition, Shallow Water Table Elevations Were Measured And It Was Determined That Shallow Groundwater Beneath The Site Flows In A Northeasterly Direction. The Six Shallow Groundwater Monitoring Wells M-1 Through M-6 Were Destroyed Under Permit From County Of Marin Environmental Health Services On July 22, 2010. Based On The Following, CAse Closure For This Site Is Considered To Be Appropriate: (1) The Site Has Been Adequately Investigated; (2) The Suspected Primary Source (The Former Older USTs) Were Removed In 1993; (3) Free Product Has Never Been Detected At This Site; (4) Impacted Soils And Groundwater Appeared To Have Attenuated To Very Low-Level Residual Concentrations Since The USTs Were Removed In 1993; (5) Shallow Groundwater Beneath The Site Is Very Brackish With ElectriCAl Conductivity As High As 17,800 Us/Cm And Therefore Not Considered A Potential Source Of Drinking Water; (6) The Residual Concentrations In The Soil And Groundwater Apparently Do Not Represent A Current Or Future Public Health, EcologiCAl, And Water Resources Threat. Tank Closure Ge Americom Point Reyes Earth 17400 Sir Francis Drake Blvd Point Reyes Station CA Diesel Other Groundwater (Uses Other Than Drinking Water) Tank Closure Rhodes' Wheel & Brake 49 Medway Rd San Rafael CA Gasoline Soil Tank Closure Las Gallinas Valley 300 Smith Ranch Rd San Rafael CA Other Inorganic / Salt, Diesel, Waste Oil / Motor / Hydraulic / LubriCAting Aquifer Used For Drinking Water Supply, Other Groundwater (Uses Other Than Drinking Water), Under Investigation A Sodium Hydroxide Spill (Naoh), Not A Ust CAse. Tank Closure Grossi Drainage 16500 State Route 1 Marshall CA Bolinas Garage 6 Wharf Rd Bolinas CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Other Means Olema Ranch CAmpground 10155 State Rt 1 Olema CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Former Mira Monte Ast Area N/A Mira Monte Marina Novato CA Benzene, Gasoline, Mtbe / Tba / Other Fuel Oxygenates Other Groundwater (Uses Other Than Drinking Water), Surface Water, Under Investigation Data Collected From The Area Of The Former Above Ground Storage Tank (Ast) And Associated Piping. In August 2014, Soil Samples Were Collected From The Area Of The Former Ast And Associated Piping. Detections Of Total Petroleum HydroCArbons (Tph) Were Reported Up To 120 Mg/Kg Of Tph-Gasoline, 34 Mg/Kg Of Tph-Diesel, 23 Mg/Kg Of Tph-Motor Oil, And Non-Detectable (Nd) Concentrations Of Benzene. On January 22, 2015, During Restoration Work Of The Mira Monte Wetlands, Smart Conducted ExCAvation Of Impacted Soils Seven Feet Below Grade At The Former Ast LoCAtion. Stained Soil Was Not Observed During The ExCAvation Despite The Reporting Of Minor Petroleum Odors. Two Soil Confirmation Samples And One Grab Groundwater Sample Were Collected At The Base Of The ExCAvation. The Soil Confirmation Samples Contained Up To 6.7 Ìg/Kg Of Methyl Tert-Butyl Ether (Mtbe), 47 Mg/Kg Of Lead, And Nd Concentrations Of Tph-Gasoline And Benzene, Below The Regional Water Board?S Esls. The Grab Groundwater Sample Contained Tph-Gasoline At 1,100 Ìg/L, Mtbe At 1,300 Ìg/L, Benzene At 190 Ìg/L, And Xylenes At 170 Ìg/L. These Groundwater Constituents Are Above Their Respective Regional Water Board Estuary Habitat Esls Of 500, 180, 46, And 100 Ìg/L1. On January 31, 2015, Grab Groundwater Samples Were Collected From Five Borings Between 10 ? 25 Feet Distance Away From The Former Ast ExCAvation. The January 31, 2015, Groundwater Samples IndiCAted Up To 520 Ìg/L Of Tph-Gasoline, 330 Ìg/L Of Mtbe, 26 Ìg/L Of Benzene, And 124 Ìg/L Of Xylenes. February 2015, Smart Breeched The Levee In The Area Of This Site And Flooded Much Of The Area To Improve The Wildlife Habitat. To Minimize Disturbances During The Breeding Season Of The CAlifornia Clapper Rail (Rallus Longirostris Obsoletus), Heavy Equipment (Such As ExCAvators) Are Prohibited In The Flooded Wetlands Including The Former Ast Area. Field Work Will Be Authorized To Resume In September 2015 Once This Endangered Species Breeding Season Is Completed This Year. Although Still Above Esls, The January 31, 2015, Groundwater Concentrations IndiCAte SignifiCAnt Attenuation A Short Distance From The Former ExCAvation. The Residual Groundwater Plume Above Esls Appears Limited In Extent. 1 See Regional Water Board Webpage: Http://Www.Waterboards.CA.Gov/Sanfranciscobay/Water_Issues/Programs/Esl.Shtml Grossi Dairy 16500 State Route 1 Marshall CA Fairfax Corporation Yard 142 Bolinas Rd Fairfax CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Nat Park Service Grossi Ranch 15000 Sir Francis Drake Blvd Point Reyes Sattion CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Richfield Service Statn 950 Diablo Ave Novato CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Shell 834 Irwin St San Rafael CA Diesel, Gasoline, Waste Oil / Motor / Hydraulic / LubriCAting Other Groundwater (Uses Other Than Drinking Water), Soil Vapor Fs/CAp Submitted December 5, 2008 The Site Is An Active Operating Shell-Branded Service Station Located On The East Side Of Irwin Street Between Second And Third Streets In San Rafael, CAlifornia, And Approximately One Block East Of Highway 101. The Site's Current Features Include Three Fuel Underground Storage Tanks (USTs), Four Dispenser Islands And Eight Fuel Dispensers, A Station Building, And A CAr Wash Building. The Site Formerly Contained A First Generation Waste Oil Ust Removed In In 1987, A Set Of First Generation Fuel USTs And A Second Generation Waste Oil Ust Removed In 1989. The Site Is Surrounded By A Mix Of Retail And Commercial Development, With The San Rafael CAnal Located Approximately 225 Feet South Of The Site. (03/30/2012 Updated Site Conceptual Model And Soil Vapor Assessment Work Plan) Tank Closure Treadwell Properties 60 Golden Gate Dr San Rafael CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Former Exxon 7-7067 930 Del Presidio Blvd San Rafael CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Corte Madera Cleaners 143 Corte Madera Town Center Corte Madera CA Other Groundwater (Uses Other Than Drinking Water), Soil, Soil Vapor Eight Monitoring Wells Were Installed In June 2006 And March 2008 At The Shopping Center Where The Subject Dry Cleaner Is Located. Soil And Groundwater Samples From These Investigations Contain SignifiCAnt Concentrations Of Pollutants. Soil Samples Contain Up To 230 Mg/Kg Of PCE And 340 Mg/Kg Of Cis-1,2-Dce. Groundwater Samples From The Monitoring Wells Contained Up To 2,500 Ppb Of PCE, 730 Ppb Of TCE, 100 Ppb Of 1,1-Dce, 200,000 Ppb Of Cis-1,2-Dce, 1,900 Ppb Of Trans-1,2-Dce, And 130,000 Ppb Of Vinyl Chloride (Vc). An Earlier Investigation In June 2002 IndiCAtes That Grab Groundwater Samples Contain Up To 44,000 Ppb Of PCE, 5,800 Ppb Of TCE, 100,000 Ppb Of Cis-1,2-Dce, And 33,000 Ppb Of Vc. The Groundwater Pollution Appears To Be Defined By The Investigations Conducted At The Shopping Center. Rwqcb Letter Dated 2/25/09 Approve Workplan For Soil Gas Investigation. Subsurface Monitoring Maritime Reality 1600 Los Gamos Dr San Rafael CA Diesel Soil Tank Closure Arco # 00254 251 Shoreline Hwy Mill Valley CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Corte Madera Investments 195 CAsa Buena Drive Corte Madera CA Waste Oil / Motor / Hydraulic / LubriCAting Aquifer Used For Drinking Water Supply, Other Groundwater (Uses Other Than Drinking Water) The Site Is Currently An Auto Dealership. Future Plans For The Property Is Not Known; However, The Site Was Remodeled Into A New Dealership In 2005. In 2003, A 500-Gallon Waste-Oil Ust, 5 Hydraulic Hoists, And An Oil-Water Separator Were ExCAvated And Removed From The Property. The Results Of The Soil Analyses On Samples Collected During This Activity IndiCAted That Tph-D Was Not Detected, Metal Concentrations Were Less Than Their Respective Ttlc Criteria, And A Maximum Concentration Of Tph-Mo Was Detected At 843 Mg/Kg. The Results Of The Groundwater Analyses Collected During This Activity IndiCAted That Tph-D And Tph- Mo Were Not Detected; A Number Of Vocs Were Detected In The Groundwater Sample With Only Benzene Detected Above Mcls. During The Course Of The Ust, Separator, And Lift Removal, Concrete Debris, Petroleum HydroCArbon Impacted Soil And Groundwater Were Generated. Fifty Cubic Yards Of Petroleum Impacted Soil Were Disposed Of At ChemiCAl Waste Management?S Kettleman City, CAlifornia Facility, 4,500 Gallons Of Petroleum Impacted Water Were Disposed Of At Seaport Refining And Environmental Of Redwood City, CAlifornia, And 2,000 Gallons Of Oil/Oily Water Were Disposed Of At Crosby & Overton In Long Beach, CAlifornia. 5 Test Borings Were Drilled In 2003 And 2004 Along With The Installation Of Monitoring Wells Mw-1 To Mw-4. The Results Of This Investigation IndiCAted That Groundwater Was Encountered At Approximately 8 To 12 Feet Bgs And Rose To 3 To 4 Feet Bgs At The Time Of Groundwater Sampling; Site Soils Consisted Of Silts And Clays To The Total Depth Explored, Free Product (Petroleum HydroCArbon) Was Noted In Boring B-2/Monitoring Well Mw-4 (Located Beneath The On-Site Building); AnalytiCAl Results And Field Observations IndiCAte That Groundwater Has Been Impacted By Hydraulic Oil; However, The Hydraulic Oil Impacted Groundwater Does Not Have Voc And Svoc Concentrations Above Their Respective Mcls. Beginning In January 2004, The Free- Floating Product Removal In Mw-4 Was First Conducted With An Absorbent Sock. The Well Initially Had 0.54 Feet Of Product Floating Above The Water. The Absorbent Sock Was Replaced With A New Sock At Each Monitoring Event And Finally Removed From Mw-4 In March 2007 Due To The Absence Of Floating Product Over The Previous CAlendar Year. In 2008, Free Product Returned To The Well And The Well Was Purged Of Free Product On A Weekly Basis For Approximately Two Months. In September, 2008, An Absorbent Sock Was Re-Installed Mw-4 With No Evidence Of Free-Floating Product In Mw-4 In December Of 2008. In January 2009, Psi Measured Approximately An Inch Of Free-Floating Product In Monitoring Well Mw-4 And Purged The Well Of Product. Psi Returned On A Weekly Basis To Measure The Free-Floating Product In Mw-4 And To Purge The Well Of Product Along With A Minimum Of 5 Gallons Of Groundwater. The Free-Floating Product In Mw-4 Was Purged PeriodiCAlly Between January And October, 2009. In December 2009, A 2-Inch Passive Skimmer Was Installed And Left In Place To CApture Free-Floating Product. From December 2009 To February 2010, Approximately 2.2 Inches Of Free-Floating Product Were CAptured By The Keck Skimmer. In March 2010 And April 2010, No Measurable Product Was Found In The Skimmer. Due To The Lack Of Product, The Passive Skimmer Was Removed From The Well On April 8, 2010. The Well Was Monitored Again For Free Product On June 18, 2010 And No Floating Free Product Was Present. The Subsequent Sampling Events Conducted In 2010 Through 2012 IndiCAted A Free-Floating Product Thickness Of About ¼- And ½-Inch, Respectively. Free Product Was Deemed To Have Been Removed To The Maximum Extent PractiCAble. In June 2012, A Site Conceptual Model Was Submitted That Detailed The HistoriCAl Work Conducted At The Site; The Extent Of Soil And Groundwater Impact; Possible Sensitive Receptors; And Limited Risk Assessment. The Site Conceptual Model Also Evaluated The Site For Possible Closure With The Results Being Discussed Below. ? The Six Criteria For A ?No Further Action? Determination Through QualifiCAtion As A ?Low Risk Groundwater CAse? Per The 1996 Rwqcb Interim Guidance Document Have Been Met And Detailed As Follows: The Leak Was Stopped (Tank And Lifts Removed) In 2003 With Subsequent Removal Of Contaminated Soil, Although A Relatively Small Amount Of Free Product Is Currently Present At The Site, The Product Has Been Removed To A PractiCAble Extent And Is Beneath An Existing On-Site Building Making ExCAvation To Remove The Remaining Product ImpractiCAble; The Extent Of The Contaminant Plume Has Been Adequately Characterized; The HydroCArbon Plume Is Not Migrating; There Are No Known Pathways To Any Sensitive Receptors From The Contaminant Plume; Based On The Lack Of Appreciable Concentrations Of Vocs, The Contaminant Plume Does Not Present A SignifiCAnt Risk To Human Health Via Vapor Intrusion; The Lateral Downgradient Extent Of The Groundwater Contaminant Plume Has Been Defined To Levels Below Detectable Levels And Is Confined Within The Boundaries Of The Subject Site With No Known Pathways To Any Sensitive Receptors, And The Residual Concentrations In The Soil And Groundwater Do Not Represent A Current Or Future Public Health, EcologiCAl, And Water Resources Threat. ? Additionally, The Eight Criteria For A ?No Further Action? Determination For The Statue Water Resources Control Board?S New ?Low Threat Underground Storage Tank Closure Summary? Have Been Met And Detailed As Follows: The Subject Site Is On A Public Water System, As The Water Provider Is The Marin Municipal Water System; The Release At The Subject Site Was Due To A Leaking Underground Hydraulic Hoist, Therefore, The Contaminants Of Concern Are Petroleum HydroCArbons; The Hydraulic Hoists, Oil-Water Separators, And Ust System Have Been Removed From The Site; Free Product Has Been Removed To The Maximum Extent PractiCAble; A Conceptual Site Model Has Been Developed To Assess The Nature, Extent, And Mobility Of The Release; Secondary Source Removal Has Been Conducted To The Extent PractiCAble; Soil And Groundwater Sampling For Mtbe Has Been Completed At The Subject Site. The Subject Site Is Not Defined As A Nuisance According To The Three Requirements Presented The Water Code Section 13050 For The Definition As A Nuisance. Tank Closure Close And Remove Tank Halling Property 12788 Sir Frances Drake Blvd Inverness CA Other Groundwater (Uses Other Than Drinking Water), Soil Minor Diesel Or Stove Fuel Spill From An Aboveground 55 Gallon Drum. Some Files And Reports Are On Geotracker. Soil ExCAvation And Cleanup Was Completed In 1994. The CAse Is Eligible For Closure. Mt Tamalpais State Park 801 Panoramic Hwy Mill Valley CA Diesel Soil Tank Closure Federal Express -Srfa 1637 E. Francisco Blvd. San Rafael CA Gasoline, Waste Oil / Motor / Hydraulic / LubriCAting, Diesel Other Groundwater (Uses Other Than Drinking Water) Ust System ModifiCAtion 1998 System Upgrades Remove Contents Proceeding Toward Tank Removal. Marin Products C0mpany Inc 55 Frosty Ln Ignacio CA Gasoline Soil Tank Closure Chevron 3501 Shoreline Hwy Stinson Beach CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Former Pini Hardware 1107 Grant Avenue Novato CA Gasoline Other Groundwater (Uses Other Than Drinking Water), Soil, Under Investigation The Site Is Developed With A Single Story Building, Built In 1947. The Building Previously Occupied By Pini Hardware And Is Currently VaCAnt. In May 2006, Six Borings Were Drilled At The Site. Boring B-3, Located Inside The Southwest Corner Of The Building Reported HydroCArbon Odor In The Soil At A Depth Of 10 Feet Bgs. In July And August 2006, Ten Soil Borings Were Advanced. Analysis Of Stained Soil From One Boring Reported Detections Of Tph-G And Tph-D. This Soil Impact Appears To Represent A Small Isolated Release Which Could Be Removed By ExCAvation. Vocs Were Also Noted During This Investigation, Probably From A Dry Cleaning Business Currently Operating Across The Street (In The Presumed Upgradient Direction) From The Site. The Dry Cleaning Facility Has Reportedly Been In Operation For Over 20 Years. In 2009, Three Soil Borings Were Drilled In The Presumed Upgradient Direction And The Impacted Soil Formerly Identified Was ExCAvated (A 20 Foot By 20 Foot Area To An Depth Of 10 Feet Bgs). Upon ExCAvation, A Previously Unknown Ust Was Encountered. The Ust Was A 500 Gallon Steel Tank Filled With Water And Some Floating Product. A Sample Of The Product Was Found To Be Primarily Gasoline. The Ust And Its Contents Were Removed From The Site Along With All Accessible Soil That Appeared To Be Impacted. The ExCAvation Was Extended VertiCAlly Until Subjective Evidence Of Any Impact Was Removed. No Groundwater (Gw) Was Noted In The ExCAvation Pit After Completion Of The Removal Activities. Soil Samples Collected During Over-ExCAvation Of The Ust Area Contained A Maximum Of 7,100 Mg/Kg Of Tph-G, 1.4 Mg/Kg Of Benzene, & Nd Concentrations Of Mtbe. After Completion Of ExCAvation, The Maximum Residual Soil Concentrations Were 710 Mg/Kg Of Tph-G, 0.014 Mg/Kg Of Benzene, And Nd Concentrations Of Mtbe. Three Monitoring Wells (Mws) Were Installed On 5/28/10, To 20 Feet Bgs. Soil Samples Contained Tph-G Concentrations To A Maximum Concentration Of 51 Mg/Kg, Butylbenzene At 45 Mg/Kg , And N-Butylbenzene At 8.9 Mg/Kg. No Other Site ChemiCAls Of Concern (Cocs) Were Detected In Any Of The Soil Samples. No Site Cocs Were Detected In Gw Samples From Mws During This Sampling Event. PCE, However, Was Detected In All 3 Mws At Concentrations Ranging From 5.3 Ppb To 12 Ppb. Based On The Findings Of This And The Previous Investigation Gw Was Not Anticipated To Have Been Impacted By Site Cocs. PCE Impacts To Gw At The Site Are Most Likely Associated With The Nearby Dry-Cleaning Operation. The Three Mws Were Decommissioned On 10/14/10. Based On The Following, CAse Closure For This Site Is Considered To Be Appropriate: (1) The Site Has Been Adequately Investigated; (2) The Primary Source (The Ust That Formerly Occupied This Site) Was Removed In 2009 Along With All Surrounding Visually Impacted Soil; (3) Following ExCAvation Of Impacted Soil, There Remains Low Or Nd Concentrations Of Petroleum Related HydroCArbons In The Soil And Gw; And (4) The Residual Concentrations In The Soil And Groundwater Apparently Do Not Represent A Current Or Future Public Health, EcologiCAl, And Water Resources Threat. Site Assessment/Site Investigation Close And Remove Tank House Of Daniels 12 Harbor Dr Novato CA Diesel Other Groundwater (Uses Other Than Drinking Water) Tank Closure Shell 85 9 Blithedale Ave E Mill Valley CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Subsurface Monitoring Pacific Bell 1 H St San Rafael CA Diesel Other Groundwater (Uses Other Than Drinking Water) Tank Closure Shell 5639 Paradise Dr Corte Madera CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Fort Baker - Bldg 407 407 Murray Circle Sausalito CA Mission Square Office Building 1007 3rd St San Rafael CA Gasoline Soil Tank Closure Mobil 121 2nd St Sausalito CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Nat Park Serv Truttman Ranch 9215 State Rt 1 Olema CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Closed CAse - Datasafe Concord #30444. Rwqcb Closure Letter Is Dated 3/24/2000. Tank Closure Maoli Consolidated Enterprises 400 Red Hill Ave San Anselmo CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Other Means Fort Barry - Ggnra Fort Barry - Battery Wallace, USTs F-12 & F-13 Battery Wallace, Ggnra Sausalito CA Under Investigation Two USTs Were Removed From Battery Wallace, Fort Barry In 1998, Close And Remove Tank Former Anderson's Boat Yard 400 Harbor Drive Sausalito CA Arsenic, Copper, Lead, Nickel, Other Metal Contaminated Surface / Structure, Other Groundwater (Uses Other Than Drinking Water), Sediments, Soil, Surface Water The Site Is Located On Richardson Bay With A PhysiCAl Address Of 400 Harbor Drive In Sausalito, CAlifornia And Is Comprised Of Boat Maintenance Yards, Paved Parking Areas And Boat Slips Within Harbor Basins (Basin 3). Prior To 1942, The Upland Portion Of The Site Was Formerly Part Of Richardson Bay. During 1942, Fill Materials Comprised Of Native Soil Were Used To Fill In Approximately 200-Acres Of Richardson Bay For Development Of The Marinship Area (Eki, 2010). The Marinship Area Was Developed By The Marinship Corporation For Ship Construction During World War Ii. In 1949, The Site Was Purchased By Clipper Yacht Company, Llc (Clipper). In 2009 Lab Analyses Of Soil Samples Taken On Site Revealed The Presence Of Metals, Total Petroleum HydroCArbons (Tphd) As Diesel, Motor Oil (Tphmo), Polychlorinated Biphenyls (Pcbs) Above AppliCAble Screening Levels. Groundwater Samples Also Contained Metals Above Screening Levels. Since Remediation Activities Have Been Completed At And Adjacent To The Site, Contaminant Levels Have Been Reduced To Acceptable Levels Or Completed Pathways Have Been Permanently Blocked, And A Site Management Plan (Smp) And A Deed Restriction Is Necessary Before The Site Receive A Nfa Letter. Site Assessment/Site Investigation Change Operating Procedures, Other Means RCA Global Antenna Farm Unknown Bolinas Mesa Bolinas CA Circle S Ranch 1740 Tomales Road Petaluma CA Lead Soil Other Means Woodacre Fire Station 33 CAstle Rock Road Woodacre CA Diesel, Waste Oil / Motor / Hydraulic / LubriCAting Other Groundwater (Uses Other Than Drinking Water) Woodacre Fire Station Is Located In A Residential Area Of Woodacre. At Its Nearest Approach, An Unnamed Tributary Is About 500 Feet Sw Of The Site. On 3/13/07, A Water Sample From A Trench ExCAvated During The Construction Of A New Wash Rack Detected Tph-D And Tph-Mo At 1,600 Ppb And 770 Ppb. A Ust Was Discovered Soon Afterward And Was Removed On 3/29/07 Along With 148 Tons Of Surrounding Impacted Soil. Soil Confirmation Samples Contained Up To 6,800 Mg/Kg Of Tph-D, 3,200 Mg/Kg Of Tph-Mo, And Low Concentrations Of Btex. A Grab Groundwater (Gw) Sample From The ExCAvation Contained 50,000 Pppb Of Tph-D. On 5/2/07, Additional ExCAvation At The LoCAtion Of The Former Ust Removed An Additional 117 Tons Of Impacted Soil And 550 Gallons Of Impacted Gw. Soil Confirmation Samples Contained Up To 2,200 Mg/Kg Of Tph-D, 1,400 Mg/Kg Of Tph-Mo, And Non-Detectable (Nd) Concentrations Of Btex. A Grab Gw Sample Contained 9,800 Ppb Of Tph-D, 5,600 Ppb Of Tph-Mo, And Nd Concentrations Of Btex. On 9/9/08, Three Monitoring Wells (Mws) And Four Soil Borings Were Installed. Soil Samples From The 9/9/08 Investigation Contained Low Or Nd Concentrations Of Tph-G, Tph-D, Tph-Mo, Btex, And Mtbe. Gw Samples From The Mws And Borings Contained 33 Ppb Of Mtbe And Low Or Nd Concentrations Of Tph-D, Tph-Mo, Btex, And Vocs. A Sensitive Receptor Survey In August & Sept. 2008 IndiCAted Pid Readings Within 250 Feet Of The Site Were Very Low And No Major Vaults Or Basements Are Located In The Site Vicinity. The Closest Receptor Is An Open Culvert Adjacent To The Site That Eventually Drains To Tomales Bay And Had A Low Pid Reading. Thirteen Domestic Wells Identified Within 2,000 Feet Of The Site, None Used For Domestic Purposes. Five Rounds Of Gw Samples From The Mws Contained A Maximum Of 70 Ppb Of Mtbe And Low Or Nd Concentrations Of Tph-D, Tph-Mo, Btex, And Vocs. Two Rounds Of Water Samples From The Open Culvert Contained Nd Concentrations Of Tph-D, Tph-Mo, Btex, Mtbe, And Vocs. Based On The Following, CAse Closure For This Site As A Low Risk Soil And Groundwater CAse Is Considered To Be Appropriate: 1) The Release Has Been Stopped And The Primary Source (The Former Ust) And The Secondary Sources (The Impacted Surrounding Soil And Gw) Have Been Removed To The Degree PractiCAble And Disposed Of Offsite. 2) The Lateral Extent Of Fhc-Impacted Soil And Groundwater Has Been Adequately Characterized. Sensitive Receptors And Migration Pathways That Could Be Impacted By The Release Have Been Identified. 3) The Dissolved Phase Groundwater Contaminant Plume Is Defined, Is LoCAlized To The Immediate Vicinity Of The Former Ust, And Is Not Migrating Off-Site. Low Groundwater Velocity Associated With Fine-Grained Soils And Dissolved Phase Long-Chain HydroCArbons With Low Solubility Should Constrain The Plume To The Vicinity Of The Former Ust. AnalytiCAl Results Show That The Voc Components Of The Plume Have Low Concentrations, Which Limits Their Migration Potential. 4) No Water Wells, Deeper Drinking Water Aquifers, Surface Water, Or Other Sensitive Receptors Have Been Impacted Or Are Likely To Be Impacted From The Release From The Former Ust. The Srs Did Not Identify Any Domestic Water Wells Within 250 Ft Of The Site Or Municipal Water Wells Within 2000 Ft Of The Site. The Drainage Ditch North Of The Former Ust Is Upgradient From The Release. 5) The Low Concentrations Of Btex And Other Vocs In Soil And Groundwater, And The LoCAtion Of The Residual Fhc Impacts Beneath Paving, Outside Of Building Footprints, In Fine-Grained Soils, Precludes A Potential Vapor Intrusion Problem. 6) The Known Current Residual Concentrations In The Soil And Groundwater Do Not Represent A SignifiCAnt Current Or Future Public Health, EcologiCAl, And Water Resources Threat. There May Be A Small Risk To Human Health That Could Be Easily Manageable If Future ExCAvations Extend To Below The Water Table In The Near Vicinity Of The LoCAtion Of The Former Ust. The Potential Risk Could Be Mitigated By Preparing A Soil And Groundwater Management Plan (Sgmp). The Sgmp Would Describe Procedures To Notify The Appropriate Regulatory Agencies, Protect Worker?S Health, And Manage Impacted Soil And/Or Groundwater If It Is Encountered. Other Means Sheen Observed During Construction Project. Ust Discovered Soon Afterward Close And Remove Tank Nike Battery 93, Sf (J09CA094400) - Aoi 3 S-158 Ready Room Ust 291 Smith Ranch Rd San Rafael CA The June 1970 General Site Map Documented A 550-Gallon Fuel Oil Ust (S-158; Figure 5-5 Of The Pa) Located On The Southern Side Of The Ready Room (S-105) In The Launcher Area. A Schonstead Magnetic LoCAtor Was Used During A Site Visit To Determine The Current Status Of The Tank. The LoCAtor Results Did Not IndiCAte The Presence Of A Ust. The Area Consisted Of Non- Native Rock And Gravel Fill Material And A 2-Foot By 2-Foot By 1.5-Foot Depression. No Stressed Vegetation Or Staining Was Visible During The Site Visit. No Records Or Closure Documents Pertaining To This Area Were Found During Research. This Aoi Is Fuds- Eligible BeCAuse No Documentation Of Beneficial Use Was Found During Research. Larkspur Park Maintenance & Twin Cities Police Facilities 250 Doherty Drive Larkspur CA Diesel, Mtbe / Tba / Other Fuel Oxygenates, Gasoline Other Groundwater (Uses Other Than Drinking Water), Soil, Under Investigation The Site Is Situated Within An Area Associated With The Closed Larkspur Disposal Site (Lds). Lds Is Identified As A Closed Solid Waste Disposal Site In The CAlifornia Integrated Waste Management Board?S (Ciwmb?S) Solid Waste Information System Database (Swis No. 21-Cr-0007). The Site Was Originally A Broad Mudflat Complex Drained By A System Of Sloughs And Creeks. In The Early 1940?S, The City Purchased The Area For Use As A Municipal Landfill And Originally Utilized The Area North Of The Project Site For Landfill Activities. In The Late 1960?S, The City Closed The Landfill And Built A Police Station And Corporation Yard Facility. A 2,000-Gallon Gasoline Ust Was Installed In 1975, As Well As A 500-Gallon Diesel Ust Of Unknown Age. The Gasoline Tank Was Subsequently Removed In 1988. The Diesel Tank Was Removed In 1996 And Replaced With An Aboveground Storage Tank (Ast). A Soil Sample Collected As Part Of The Removal In 1996 Contained Total Petroleum HydroCArbons As Diesel (Tph-D) At 70 Milligrams Per Kilogram (Mg/Kg). The Site Has Subsequently Been Cleared Of All Structures And The Diesel Ast Removed From Its Concrete Pad. On December 3 And 4, 2009 Eight Soil Borings (Sb-1 Through Sb-8) Were Installed At The LoCAtions Shown On Figure 2 (Appendix A). Soil Samples From The Borings Contained Up To 15.8 Mg/Kg Of Tph-G, 2,910 Mg/Kg Of Tph-D, And Non-Detectable (Nd) Concentrations Of Btex, Mtbe, And Other Oxygenates. Grab Groundwater (Gw) Samples From The Borings Contained Up To 3,490 Ug/L Of Tph-G, 3,950 Ug/L Of Tph-D, 11.3 Ug/L Of Benzene, And 4.83 Ug/L Of Mtbe. ExCAvation Of Impacted Soil Was Performed On 4/19/10 (See Figure 2) With A Maximum Depth Of Approximately Seven Feet Below Ground Surface (Bgs). Approximately 160 Cubic Yards (269 Tons) Of Impacted Soil Was Removed And Hauled To Keller CAnyon Landfill At 901 Bailey Road, Contra Costa County, CAlifornia. 8,984 Gallons Of Petroleum HydroCArbon Impacted Groundwater Encountered During ExCAvation Activities Was Pumped From The ExCAvation Into A Holding Tank, Treated With Granular Activated CArbon And Discharged To The Sanitary Sewer. Soil Confirmation Samples Collected Following ExCAvation Contained A Maximum Of 47.8 Mg/Kg Of Tph-D, 0.006 Mg/Kg Of Mtbe, And Nd Concentrations Of Tph-G And Btex. A Grab Gw Sample From The ExCAvation After Removal Of The Impacted Gw Contained 92 Ug/L Of Tph-G, 347 Ug/L Of Tph-D, And Nd Concentrations Of Btex, Mtbe, And Other Oxygenates. Based On The Following, CAse Closure For This Site Is Considered To Be Appropriate: (1) The USTs Were Removed In 1988 And 1996 And No Longer Represent A Source At The Site: (2) Impacts To Soil And Groundwater From The Former USTs Have Been Adequately Characterized: (3) Petroleum HydroCArbon Impacts From The Former USTs Have Largely Been Removed With Only Minor Residual Impacts Remaining In The Area Of The Former ExCAvation; (4) The Site Is The Future LoCAtion Of The Twin Cities Police Authority (Currently Under Construction) And Will Not Be Developed For Residential Use In The Near Future; (5) The Twin Cities Police Authority Building Is Designed With A Liquid Boot? Vapor Barrier Coupled With A Gravel Geo Ventilation System; (6) The Former Ust And ExCAvation LoCAtion Is Beneath The Twin Cities Police Authority Building Thereby Limiting Any Future Human Contact; (7) BeCAuse The Source(S) Has Been Removed Along With Impacted Soil, The Residual Groundwater Impacts Are Expected To Attenuate In A Reasonable Period Of Time; (8) The Residual Concentrations In The Soil And Groundwater Apparently Do Not Represent A Current Or Future Public Health, EcologiCAl, And Water Resources Threat. Site Assessment/Site Investigation Close And Remove Tank At & T 1100 Eliseo Dr S Larkspur CA Gasoline Under Investigation Tank Closure James River Corp 195 Tamal Vista Blvd Corte Madera CA Diesel Other Groundwater (Uses Other Than Drinking Water) Tank Closure Southern Pacific Black Point Bridge Unknown Grandview & Harbor Black Point CA Gasoline Under Investigation Tank Closure Mobil 5581 Paradise Dr Corte Madera CA Gasoline Other Groundwater (Uses Other Than Drinking Water) Tank Closure Newhall Residence 2900 Paradise Dr Tiburon CA Heating Oil / Fuel Oil Aquifer Used For Drinking Water Supply