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' IF ORMER ARCO#6100 0 Page 1 of 2 <br /> Path to Closure Plan <br /> GO OTRp^KER HOM MANAGE RROJ LTJI BlamISIS C ILODO <br /> _..______------------- OPEN-ASSESSMEMBINTERIM REMEDIAL ACTION <br /> FORMER ARCO#6100(706077001 92)-MAP THIS SITE eee,UpowaglGHT AGENLIE9 <br /> 25775 PATTERSON PASS RDS pTIVITIE6 REPORT SAI CASEOIWRK1ERN'IYK�CYAS SU RNSOR:ADRIENNEELLSAESSER <br /> TRACY,CA 95376 PUBLIC WEBPAGE CENTRALVALLEY RWO0B(REGION SS)-CASE#:380463 <br /> SAN JOAQUIN COUNTY CASENORKER:JAMES BARLO�! -SUPERVISOR:LORI CONDON <br /> VIM PRIt^6DLEC"SESUMNLARVFORTHIS3ITE CUFClalm x:8512 CUFPdouy Aas181MBD CUFAmoud Ni..aw <br /> THIS PROJECT WAS LAST MODIFIED By CKI MCCARTNEYON 12/51201310:39:17AM-i STORY <br /> THIS SITE HAS SUBMMAL,CucKHM TO OPEN A NEW WINDOW WITH THE WBMITTALAPPROVAL PAGE FOR THIS SITE. <br /> path to Closure Plan-FV 12/13 <br /> THIS VERSION IS FINAL AS OF 14/52013 PATH TO CLOSURE HISTORY CLeAR180ET THTO^'O RE UN <br /> IMPEDIMENT 1: <br /> !igg Criteria A:The unauthorized release la NOT located within the service area of a public water F Procedural Impediment-INFO <br /> sstem <br /> rcLIE STEW COMPLETION DATE <br /> Step to Readwlmpatllmemf-Slap 1:- ervin the facility. The site moat be [emetliatee <br /> The site has an ou-site public we at system That is a 9 �p p De <br /> not Deco <br /> such that it can be demonstrated that the well will me impacted. 17129201] I J <br /> sufficiently -------- <br /> IMPEDIMENT 2: <br /> Ganyral Criterta D:Free product has NOT been removed to the maximum extent practicable ❑ Procedural Impediment- +nf <br /> COMPLETION DATE <br /> Slap to Resolve Impediment 2-Step 1:-DELETE STEP and is removed when found; flee product has Free product is present in off-site monitoring well Mx15 most of P DTE ACTU LDATE <br /> wells; it may take several yearn to capture 1NJ12015 <br /> been [educed to sheen or absent in other of£-alta <br /> the free product. <br /> _____------ ADD LDP InONAL STEP <br /> IMPEDIMENT 3: <br /> ❑ Procedurellmpediment-INro <br /> General Criteria F:Secondary source has NOT been removed to the extent practicable <br /> COMPLEnON DATE <br /> Stap to anon(M/lm•nt]-$-site DELETE STEP 2013 according to Rp's consultant <br /> Remedlatvon (site res off-site must ed ikslfive years to <br /> startup <br /> addres by Nov. 1, 333 pounds of — ROJEL OD TE L� T I LDATE <br /> sate remediation requires five yearn to seeress vad zone, [emovrng 179, _1229201] <br /> tical p on off-site remediation once begun. -- <br /> total petroleum hydrocarbons (TPH). Anticipate several years forthe <br /> a STEP <br /> dnoN <br /> IMPEDIMENT 4: <br /> Media Soe 'flc Criteria Groundwater:The contaminant plume that exceeds water quality objectives is ❑ Procedure/Impediment-wso <br /> NOT stable or decreasing In areal extent,and does NOT meet all of the additional charecterlsUcs of one of <br /> the five classes of sites. <br /> Conditions that do not meet the policy criteria: <br /> • Plume Length(That Exceeds Water Quality Objectives):a 250 Feet and<1,000 Feet <br /> • Benzene Concentration:2 3,000 pgll <br /> • Nearest Supply Wall(From Plume Boundary):5 260 Feet <br /> OMIPLETON DAM <br /> Step to Read"Impartment 4.Step 1:-M PTE STEP <br /> off-site must be implemented Sausediately to reduce contaminant concentrations, o0. C DATFs ACTUALULM <br /> ftemetliation ISVE/IA51 untlwatar both on-site 2013 amo[ding — <br /> mass, antl migration in soil and gro antl off-site. startup by Nov.l, removin I 14/292!)17 <br /> remediation required five years t0 address vadose [one, 9 - <br /> to RP's cnnaultant A[catlie. On-site nrf-cit+ =meth�ei nn.nn�.- n+nun ._ - J <br /> t]E_it4.nn,mAv_e,4_TDH—_PnGi.:inxta eere�a, a.ea�e Pn.'.11.n -- <br /> DD ADgnONAL STEP <br /> IMPEDIMENT 6: <br /> NX <br /> oec'flc Crit ria'Direct Contact and Outdoor Air EKDOBUM,The site Is NOT considered low-threat CI Procedural Impediment-wFo <br /> t contact and outdoor air exposure as it does NOT meet 1,2,or 3. <br /> ns that do not meet the policy criteria: <br /> sure Type:Utility Worker <br /> leum Constituents in Soil:>6 Feet bgs and 510 Feet bgs <br /> Concentrations of Benzene:>14 mg/kg <br /> Concentrations of EthylBenzene:>89 mg/kg and 5 134 mg/kg <br /> Concentrations of Naphthalene:UnknownConcentrations of PAH:Unknown <br /> ON DAM <br /> r%ptoRssdv*lmPed.17�Nt6-Slept: DETESCOMPLEwas curharled m 2010, conflzmatlon sampling should be conductetl; theecn.GGT DE UATEniteemetlii (SVE/IAS) issues. submit work plan fo[linp[ogram should include sampling to address the h.nhealeh risk y382014irmation and hwun hea1M risk assessment (HHPA) sampling. <br /> Step to R.I.Impediment 5 Step 2:-DE 91E1TEP COMPLETION DATE <br /> conduct confirmation and HHRA sampling antl submit report of finings. JEC D TE �AO L <br /> 313112015 <br /> __. . ..ADD ADDITONALSMP <br /> https:Hgeotracker.waterboards.ca.gov/regulators/screens/closure_policy.asp?global_id=TO... 12/5/2013 <br />