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Centel Street Parts <br /> _:4 <br /> January 30, 2012 <br /> Recommendation <br /> March 2008, the San Joaquin County'LOP should approve <br /> assessment in Feb 2008. The Fund concurs with theadd,itio a! nvestigation and nal w. <br /> site next year to track progress x yti k will review this <br /> UPDATED,'March 2009, the-Fund recommends'that the San`Joaquin County LOP direct the <br /> Responsible Party to restart the remediation system and to consider a more aggressive <br /> technology to achieve Water Quality Objectives in the source area more rapidly. The Fund will <br /> review this site next year to track progress. , <br /> UPDATED, March 2010, the Fund recommends that the San Joaquin}County LOP consider <br /> reviewing this site for closure. <br /> UPDATED,+February 2011, the Fund recommends that the San"Joaquin County LOP consider <br /> re.viewing this site for closure. '' E ._, ,, g; . A <br /> UPDATED, February 2012, source area monito�ing'welI MW72 has.historically had elevated <br /> concentrations of residual-hydrocarbons in groundwater.'.,Hoivever, after 1:1 years of monitoring <br /> and source reduction, t66 groundwatertplume is shrinkih in size`and c'ncentr`ation. Analytical <br /> data indicate that WQOs have been achieved in down gradient well MW-4. Groundwater within <br /> the source area will likely remain above WQOs for.years to decades. The affected shallow <br /> groundwater is not used as a source of water supply nor is it likely to be used as a source of <br /> water supply in the foreseeable future. Water users in the vicinity of the site rely on the City of <br /> Stockton Water District. Based on facts in the record and hydrologic and geologic conditions at <br /> the site, the limited residual petroleum hydrocarbons that remain in soil and groundwater pose a <br /> low risk to human health, safety and the environment. The Fund recommends that the San <br /> Joaquin County LOP review this site for closure. <br /> Kirk Larson, P.G. Date. Robert Trommer, C.H.G. Date <br /> Engineering Geologist Senior Engineering Geologist <br /> Technical Review Unit Chief, Technical Review Unit <br /> (916) 341-5663 (916) 341-5684 <br /> :.eI <br /> I <br /> J <br />