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0 <br /> ENVIRONMENTAL HEALTH DEPARTMENT <br /> SAN J(I QUIN CO TY <br /> a bonne T€,Acran,;R,E.H.S�: Program Coordinators <br /> _ Dire�xar <br /> 304 East Weber Avenue,Third Floor Carl borgtnan,R.E.H.s. I <br /> • ,: Laurie A.Cotulta,> .> .>it:s. toerkton,,California 95202-2708 Mike Huggins,R.E.H.s.,R,D:i. <br /> Assistant Director Teleph©ne: 468-3420 -Margaret Laganq iR E II:S. <br /> Robert McCleIIon;3t.E.TI.S: <br /> Fax:V09)464-0138 Jeff Carruesoo,R.Ens. <br /> Website wcvw:sjgou.org/ehdl KOO Y6.1ey,RXK s: <br /> VCTI.i.2 <br /> D f1 XDER DHOOT <br /> 15600- S 'HARL Rt`iA» <br /> ;LATHROP CA 953:3:0 <br /> ARE: .]oe's glace SITE C0_DE.: 231.585 <br /> 1'.5600':Harlan:Road <br /> Lathrop, .. <br /> San Joaquin County ErivWorirrtental Health Department(EHb)has reviewed the"Response'to <br /> August 29,2006 SJCEHQ Letter and Request for Revised Work Plan Submittal Date"(Letter). <br /> dated September 27,2006,and-the"Quarterly Groundwater Monitoring Report"(Report)dated l <br /> August 25, 2006,prepared by SECOR International Inc.for the above referenced site. The <br /> ` Report recommends eliminating 1;2-DCA, EDB, ethanol and methanol from the suite of analytes <br /> being tested for in the water samples from the monitoring wells. EHD approves this <br /> recommendation. The Letter recommends that the fuel oxygenates (except MTBE)and lead <br /> scavengers be eliminated or reduced in the groundwater monitoring. EHD does not approve of. <br /> the elimination of the fuel oxygenates(except MTBE)since TAME has been found in the <br /> groundwater samples from MW9 since it was installed and intermittently in the groundwater <br /> samples from other monitoring wells. SECOR may be more specific on the proposed reduction of <br /> testing for the fuel oxygenates (except MTBE)in future reports <br /> In the Letter it states that samples from MW©-"2 and MW-11 have detectable concentrations of ? <br /> MTBE but they are below the maximum contaminant limits. Please be advised that the <br /> Secondary Maximum Contaminant Revel (MCL)for MTBE in public drinking water is"5 parts per <br /> billion(ppb). In June 2006 the water sample from MWO-2 had 7.1 ppb crf MTBE and the water <br /> sample from MW-1 I had 8.8 ppb of MTBE,both of these water samples exceeded the MCL for s <br /> MTBE in public:drinking water, Contaminated groundwater plumes are considered defined when <br /> there is no detection of contaminants in the water In all directions laterally and vertically from the <br /> source area(s);using appropiriate test methods and detection limits. Definition of the.contam nated <br /> groundwater plume at this site has not been completed. According to the Report the groundwater <br /> gradient was veria0101M dune 2006 rangingfrom north-northeast to tbd west so this::should be. <br /> considered when proposing further site investigation. The Letter requests that the submittal date <br /> for a work plan for plume delineation be revised to November 15,200& <br /> Therefore, EHD expects a work:plan for defining the MTBE contaminant pllrme to be.submitted to. <br /> EHD.0 Nave€�Iber 1:5,:2006. <br /> If you have"arty q�uestions;cvntect stir at;(ZQ9)468-3449. <br /> Donna Haran; 1 REH$;b rpetor <br /> Environmental Health'Departmen.t <br /> tUlargaret agyria, REHS:: <br /> Program Coc rdinator Unit IV <br /> c tVRWQCB—Jim Barton <br /> SECOR—Gary Haeck <br /> . r <br />