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FORMER ARCO#61000 • Page 1 of 2 LTCP Checklist n Nil GFOTRACKER HOME I MANNGEPROJ--- -------- @4H LgSf951L FORMER ARCO(16100(70607700192)-MAP THIS SITE OPEN-ASSESSMENT&INTERIM REMEDIAL ACTION 25775 PATTERSON PASS RD S ACTIVITIES REPORT SAN30AOUIN COrtNTY<v LOOP(LEAD)-cases.1708 TRACY,CA 95376 CASEWORKER:HARL rN KNOLL-SUPERVSOR:ADRIENNE ELLSAESSER SAN JOAQUIN COUNTY PUBLIC BPA CENTRAL VALLEY Writes(REGION 5S)-CASE It.390265 CASEWORKER:JAS-SUPERVISOR:BRIAN NEWMAN MEW PRINTABLE CASE SUMMARY FTHIS SITE CUF Cblm Y:8512 CUF Priority Acaigmd:0 CUF Amount PaM:IQ THIS PROJECT WAS LAST MODIFIED By NARLIN KNOLL ON a3rP1311:014o AM-1HISTORY THIS SITE HAS SUBMITTALS.CLICK JIM TO OPEN A NEW WINDOW WITH INE SUBMITTAL APPROVAL PAGE FOR THIS SIZE. CLOSURE POLICY THIS VERSION IS IN PROGRESS AS OF 513011013 CHECKLIST INITIATED ON 5/30'2013 CLOSURE POLICY HISTORY General Criteria-The Site safisfies the policy general criteria-CLga SECTION ANSWERS NO a.Is the unauthorized release located within the service area of a public water system? O YES la NO b.The unauthorized release consists only of petroleum Jj0JM. 0yAYES O NO c.The unauthorized(°primary)release from the UST system has been stopped. III O NO L H P.<e nrrches been removed to the maximum extent practicable=. Mw1s 1r4�2c13 0 G FP Not Encountered is VES XK0 e.A conceptual site model that assesses the nature,extent,and mobility of the release has been developed infol. G ES C NO f.S coi source has been removed to the extent tacticabla ' ya Impediment to Removing Secondary Source(Check all Met Apply): r Remission Has Net Seen Attempted e,(v` I��/•""— F_ amediafion Was Designed Incorrectly r YES NO F_Remediation Was Shut Oa Prematurely r Poor Remediation O&M F Done, - oR-site remetliiel pendirg. g.Soil or groundwater has been tested for MTBE and results reported in accordance with Health and Safety Code Section C Not Required'arVES O NO 25296.15. h.Does a nuisance exist,as defined by Water Cad Section13050. C VES NO 1.Media-Specific Criteria:Groundwater-The contaminantplume that exceeds water quality objectives is stable or decreasing in areal extent,and meets all of the additional characteristics of one of the five classes of sites listed below.-CLEAR SECTION ANSWERS EXEMPTION-Soil Only Case(Release has=Affected Groundwater- nfo) C VES NO Does the site meal any of the Groundwater specific criteria scenarios? C YES P"NNO 1.1-The contaminant plume that exceeds water quality objectives is<100 4-in length.There is no free product The nearest existing water supply well or lip VES surface water body is>250 feel from the defined plume boundary. 1.2-The contaminant plume that exceeds water quality objectives is<250 f trill length.There is no free product.The nearest existing water supply well or surface water body is>1,000 feet from the defined plume boundary.The dissolved concentration of benzene is<3,000 pg/L.The dissolved Concentration of G YES W NO MTBE is<I,ODO Yg/L. 1.3-The contaminant plume that exceeds water quality objectives is<250 feet in length.Free product has been removed to the maximum extent practicable,may still be present below the site where the release originated.but does not"tend off-site.The plume has been stable or decreasing for I@ YES 10/t 0 minimum of five years.The nearest existing water supply well and/or surface water body is>1,000 feet from the defined plume boundary.The property owner is willing to accept a land use restriction if the regulatory agency requires a land use restriction as a condition for closure. 1A-The contaminant plume that exceeds water quality objectives is<1,000 feel in length.There is no free product.The nearest existing water supply well @ YES "O or surface water body is>1,000 feet from the defined plume boundary.The dissolved concentrations of benzene and MTBE are both cl.MO pg/L. 1.5-The regulatory agency determines,based an an analysis of site Specific conditions,that the site under current and reasonably anticipated near-term future scenarios,the contaminant plume poses a low threat to human health and safety and to the environment and water quality objectives will be achieved 9 YES ONO within a reasonable time frame. 2.Media Specific Criteria:Petroleum Vapor Intrusion to Indoor Air-The site is considered low-thmat for the vapoPlnfrusion-to-airpathway if site- YES specific Conditions satisfy items 2a,2b,or 20-CLEAR SECTION ANSWERS 3.Media Specific Criteria:Direct Contact and Outdoor Air Exposure-The site is considered low-threat for direct contact and outdoor air exposure NO if it meets 1,2,or below.-CLEAR SEC ON ANSWERS EXEMPTION-The upper 10 feet of soil Is free of petroleum contamination OYES NO Does Ne site meat any of the Direct Contact and Outdoor Air Exposure criteria scenarios? r YES Is NO ADDITIONAL QUESTIONS-Please Indicate only those conditions that do not meet the policy criteria: Exposure Type: C Residential r Commercial r Utility Worker Petroleum Constituents In Soil: r 5 5 Feet bgs G >5 Feet bgs and 510 Feel bgs C Unknown Soil Concentrations of Benzene: r>14 m r Unknown r>1.9mg/kg and A2.8mgrxg r>2.8mg/kg and 58.2mg/kg r>8.2mgMgand 512mg/kg C>12mgtkgand sl4mgfkg mg/kg Soil Concentrations of EthylBenzene: r >314 mg/kg C Unknown r>21mg)kgand 532mg/kg r>32mglkgand S89Ing" r>89mglkgand A134mg/kg C>134mglkgand 5314mgAg g g Soil Concentrations of Naphthalene: o>9.7mglkgand A45mglkg C>45mgfkgand a219mglkg C'>219mg/kg lis Unknown Soil Concentrations of PAH: https:Hgeotracker.waterboards.ca.gov/regulators/screens/closure_policy.asp?global_id=TO... 6/28/2013