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FORMER ARCO #6100 • /h ,1�y�50A&� Page 1 oft LTCP Checklist . 250TRACKER HOME IMANAGE PROJECTSI BgEOBT-aI&.6= OL GOUT FORMER ARCO#6100(TO607700192)-MAP THIS SITE OPEN-ASSESSMEHTa INTERIM REMEDIAL ACTION sx POy RSI HTA N . 25775 PATTERSON PASS RD S ACTIVITIES REPORT SANJOApUIN COUNTY LOP(LEAD)-CASE 6:17M TRACY,CA 95376 CAsaWoaKER:HARLIN KNOLL-SUPERNSOR:ADRIENNEELLSAESSER SAN JOAQUIN COUNTY PUBLIC WEBPA E CENTRALVALLEY RVJOCB(REGION 55)-CASE a:390205 VIEWPRINTARLE CASE SUMMARY FOR THIS SITE CASEWORKER:MMEaa°.RTON-SUPERNSOR:BRIANNEWMAN CUP Claim P:9512 CUF Priority Asigne@ D UUFAmoum PaId:N THIS PROJECT WAS LAST MODIFIED BY bVJLBENQE&=ON WWO1310:34:30 AM-jLy= THIS SITE HAS SUBMITTALS.CLICK HIM TO OPEN A NEW WINDOW WITH THE SUBMITTAL APPRWAL PAGE FOR THIS SITE. CLOSURE POLICY THIS VERSION IS IN PROGRESS AS OF 6/28/2013 CHECKLIST INRIATED OW WWO13 CLOSURE POLICY HISTORY General Criteria-The site satisfies the policy general Criteria-CLEAR SEOTON ANSWERS NQ a.Is the unauthorized release located within the service area of a public water system? rYES C NO b.The unauthorized release consists only Of petroleum L=. C YES C NO c.The unauthonzetl('primary')release from the UST system has been Stopped. C YES C NO d.Free product has been removed to the maximum extent practicable IIOfM. C FP Not Encountered C YES C NO e.A conceptual site model that assesses Ne nature,extend,and mobility of the release has been developed(WO). C YES C NO f.Secondary source has been removed to the extent practicable Impedimerd to Removing Secondary Source(Check all that Apply): I—Reme flation Has Not Been Attempted F'Remediation Was Designed Incorrectly r YES C NO F_Remediation Was Shut OR Prematurely F_Poor Remediation O&M F Other - mists remedietin laMending g.Soil or groundwater has been tested for MTBE and results reported in accordance with Health and Safety Cod.Section C Not Required r YES C NO 25296.15. h.Does a nuisance exist,as defined by Water Code section 13050. C YES C NO 1.MadiaSpeciFic Criteria:Groundwater-The contaminant plume that exceeds waterguafity objectives is stable ordecreasing in areal extent,and NO meets all of the additional characteristics of one of the five classes of sites listed below.-BLEAR secnou ANSWEns EXEMPTION-Soil Only Case(Release has nM Affected Groundwater-Info) C YES C NO DOGS the site meet any of the Groundwater specific criteria scenarios? C YES C NO ADDITIONAL QUESTIONS-Please Indicate only those conditions that do not meat the policy cdteda: Plume Length(That Exceeds Water Quality Objectives): r z 100 Fast and�250 Feat r z 250 Feat and<1,000 Feel C z 1,000 Feet r Unknown Plume is Stable or Decreasing in AREAL Extent: r No r Unknown Free Product in Groundwater: C'Yes C No C Unknown Free Product Has Been Removed to the Maximum Extent Practicable r No C Unknown For sites with free product,the Plume Has Been Stable or Decreasing for 5-Years(Info): C No r Unknown For sites with free product,owner Willing to Accept a Land Use Restriction(if required) C No r Unknown Free Product Extends Offsite: C Yes C Unknown Benzene Concentration r z 1,000 pg/I and 13,0130 pgll C z 3,0110 pgn C Unknown MTBE Concentration: C z 1,000 pgll C Unknown Nearest Supply Well(From Plume Boundary): (s s 250 Feet C>250 Feat and s 1,000 Feet C Unknown Nearest Surtace Water Body(From Plume Boundary): r s 250 Feat G>250 Feet and s 1,000 Feet r Unknown 2.Media Specific Criteria:Petroleum Vapor Intrusion to Indoor Air-The site is considered low-threat for the vapor-inbusion-to-airpathway if site- YES specific Conditions Satisfy Items 2a,2b,Or 2C-CLEAR SECTION ANSWERS EXEMPTION-Active Commercial Petroleum Fueling Facility C YES C NO 3.Media Specific Criteria:Direct Contact and Outdoor Air Exposure-The site is considered low-threat fbrdirect contact and outdoor air exposure NO if it meets 1,2,or 3 below.-cls-AR secnox ANSKERs EXEMPTION-The upper 10 feet of soil is free of petroleum contamination C YES C NO bttps:Hgeotracker.waterboards.ca.gov/regulators/screens/closure—Policy.asp?global_id=TO... 6/28/2013