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FORMER ARCO#6100 Page 1 of 2 <br /> ----� ncnmerK R�MEI"e rE PRQIECTS IBELBTfile�P9RSJJI�� <br /> Path to Closure Plan _. i:J GO' <br /> OPEN-ASSESSMENT B INTERIM REMEDIAL ACTION <br /> FORMER ARCO#6100(T0607700192)-MAP THIS.SITE c Up 0 RS <br /> AGENCIES <br /> EA 170 <br /> 25775 PATTERSON PASS RD S ACTIVITIES REPORT CASEwO�R�Kt MQQ6C-RTNEy S SUpERM50R:ADRIENNE ELLSAESSER <br /> TRACY,CA 95376 aPUBLIC WEBPAGE CENTRALVALLEY RMCB(REGION 56)-CASE#390265 <br /> SAN JOAQUIN COUNTY CASEVA)RI4ER eMESBARmN-SUPERVISOR:LORI CONDON <br /> El PRIH RLEL SESUIONY FORIHISSITE WFOkimt9512 LUF PriarBy AulMD CUF AmouMPai4:� <br /> THIn!RJECT WAS LAST MODIFIEDBYN X ND R ON ON 12/4120132:28:14 PM-HISTORY <br /> THIS SIZE HAS SUBMITTALS.CLICK no—TOOPEN A NEW WINDOW VATH THE SUSMITTALAPpROVAL PAGE FOR THIS SITE. <br /> THISVERSION IS FINAL AS OF 1 M O13 PATH TO CLOSURE HISTORY <br /> 11TH TO LOSURE PLAN <br /> Path to Closure Plan-FY 12113 <br /> IMPEDIMENT 1: <br /> General the service area of a public water fl Procedure/Impediment-INF <br /> Criteria A:The unauthorized release is NOT located withi <br /> system <br /> COMPLETION DATE <br /> Step to Resolve Impediment 1-Step 1DE,° S ° <br /> water system ihat is serving the facility. The site moat De xemetllatetl °°n,PCTED DAIS ACTUAL M <br /> The site hay an on-site public well will not become impacted. 1M9/2D17 <br /> sufficiently such tbat is can be demonstrated that the - <br /> IMPEDIMENT 2: ❑ Procedure/Impediment- _FFO <br /> General Criteria D:Free product has NOT been removed to the maximum extent practicable <br /> COMPLETION DATE <br /> Step to Resdve lmpadlmaMt-Slee I--1111LEILM <br /> in off-site monitoring well HN15 antl is removed when found; free Product has j o°n icCTEO OAIE ACTS o TE <br /> Pres product is sheen o o several to capture most of 1 1y3112015 IG— <br /> been reduced to sheen o[ absent in other off-siie wells: it maY take s years _ <br /> tM1e free product ----------- <br /> _. s^DADDITONALSTEP <br /> IMPEDIMENT 3: F (- Procedurellmpediment-INFO <br /> General Criteria F:Secondary source has NOT been removed to the extent practicable <br /> COMPLETION DATE <br /> Starts Rations lmpe/IAH) off <br /> i1:-nP PTE STEP consultant <br /> ust be S�lemented. 9[artup by Nov. 1, 2013 according to RP's O C DD C LDA <br /> Remediation IsiteIAS) o£f-site m vadose zone, =emoving 174,339 lea TeH. <br /> A[caaia. On site remediation requires five yearn to address <br /> Anticipate <br /> several years for the off St remedl.ti nce began. <br /> —.—.A_ TDNAL STEP <br /> IMPEDIMENT 4: <br /> N9 Is- Ific C ria:Groundwater-The OT st bile or decreasing in aeal extent.antl doesi NOTnant pmeet alume ll of the additioat exceeds nal er eharacto stis of one of Procedural Impediment-yEg <br /> the five classes of sites. <br /> Conditions that do not meet the policy criteria: <br /> • Plume Length(That Exceeds Water Quality Objectives):2250 Feet and<1,000 Feet <br /> • Benzene Concentration:23,00011911 <br /> • Nearest Supply Well(From Plume Boundary):5 260 Feet <br /> COMPLETION GATE <br /> StepW Reaolve lmpedimeM4-Strap 1:- E contaminant concentrations, mass, dna <br /> oYY-site must be 1 lementetl A9AF Co reduce eon mTEp DALE T D—TE <br /> Aemetlis[ion (9VE/IAS) r mP 2013 accord [0 Apia F <br /> migra[icn in soil antl groundwater both on-site and ofP-site.9tartup by Nov. l• one, emoving 174,339 1229(2D1] <br /> required five years t address vado e z = <br /> consultant Arcadis. 0 C remediation qu <br /> 1,nar.Fn[ [Fdn£f-¢i. _pmadtaf 4an. haean_- -- <br /> tna_m. ADD ADDITIONAL STEP <br /> IMPEDIMENT 6: <br /> Media Specific Criteria:Direct Contac t and Outdoor Air Exposure:The site is NOT considered low-threat Cl Procedural l Impediment-Ig <br /> for direct contact and outdoor air exposure as it does NOT meet 1,2,or 3. <br /> Conditions that do not meet the policy criteria: <br /> • Exposure Type:Utility Worker <br /> • Petroleum Constituents in Soli:>5 Feet bgs and 510 Feet logs <br /> • Soil Concentrations of Benzene:>14 mg/kg <br /> • Soil Concentrations of EthylBenzene:>89 mg/kg and 5134 mg/kg <br /> • Soil Concentrations of Naphthalene:Unknown <br /> • Soil Concentrations of PAH:Unknown <br /> COMPLETION DATE <br /> Step to Resolve Impedimenl5-Step 1: <br /> the <br /> - <br /> fimtlon sampling could be conducted; p IP TED pAIE I Amp <br /> on-site remediation dElI w a curtailed in 2010, conrnssuea. 9ubmie work plan for ^EI302014 f J <br /> sampling program shoululinc <br /> d SnclutleasanPling to address the hwnan health risk i <br /> confirmation and OHM sampling. -__ _ ------ <br /> —. <br /> _. _.. ._ —.. LOMPIETION DATE <br /> Step to Resolve Impediment 5-Step 2: PTESTEP- JE D ACTU L- <br /> am ling and submit report of findings. <br /> Conduct confirmation and NHRA a P ,yrm_31(1D16 <br /> _ _ J <br /> ' -"—"— -- -- ADD ADDITIONAL 3IEP <br /> hitsq-//oeotracker.waterboards.ca.gov/regulators/screens/closure_policy.asp?global_id=TO... 12/4/2013 <br />