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ENVIRONMENTAL HEALTH DEPARTMENT <br /> SAN JOAQUIN COUNTY <br /> (brit Supervisors <br /> c. Donna K.Heran,R.E.H.S. Carl Bor man.R.E.H.S. <br /> D;recta 304 East Weber Avenue, Third Floor Mike Huggins,R.E.H.S.,R.D.I. <br /> At Olsen,R.E.H.S. Stockton, California 95202-2708 Douglas W.Wilson,R.E.H.S. <br /> Program ftifm7agerTelephOIle: (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> �tFOR Laurie A.Cotulla,R.E.H.S. <br /> Fax: (209) 464-0138 Robert McClellan,R.E.H.S. <br /> Program Manager Mark Barcellos,R.E.H.S. <br /> REMO CANEPA <br /> CANEPAS CAR WASH <br /> 1536 N HUNTER <br /> STOCKTON CA 95204 <br /> RE: CANEPA'S CAR WASH Site Code: 1148 <br /> 248 PARK STREET <br /> STOCKTON CA 95202 <br /> WORKPLAN: Additional Soil and Groundwater Investigation by Cone Penetrometer Testine <br /> DATED: Novemberl, 2002 PREPARED BY: Condor Earth Technologies, Inc. <br /> RECEIVED BY ENVIRONMENTAL,HEALTH DEPARTMENT (EHD) ON: 1anuan- 17, 2003 <br /> APPROVED with Conditions(See Below) ❑ ADDENDUM Submit by : <br /> ADEQUATE AND NECESSARY ELEMENTS OF THE WORKPLAN (H&S 25299.37,subd.(c)(3).): <br /> 1. Advance four groups of twinned cone penetrometer(CPT) borings across the street north of the <br /> above-referenced site,and one group of triple borings in the area of the former underground storage <br /> tanks (UST) to 150 feet below surface grade (bsg) to collect grab water samples and soil samples. <br /> Analyze soil and ground water samples using EPA\Method 8260B. Detection limits of oxygenates <br /> Will be 0.5 to 5.0 micrograms per liter(µg/1). <br /> 2. Install one discrete depth continuous multi-chamber monitoring well (NICW� with 7 screened <br /> intervals in the area of the former UST. <br /> COMMENTS AND CONDITIONS: <br /> 1. Implement the proposed work plan will be in two separate phases as proposed. Obtain analytical <br /> results of the soil and grab groundwater samples from CPT borings the street north of the site before <br /> proceeding with the installation of the deep MCW at the site. :analytical results of the CPT boring <br /> samples may indicate the need for more than one deep_%MC%V to define the three-dimensional extent <br /> of contamination. <br /> 2. You are required to install additional NICW on and off site if needed based on the analytical results of <br /> the CPT boring data. EHD recommends you take that contingency into consideration when applying <br /> to the Clean Up Fund. <br /> 3. The detection limit for methyl tert butyl ether('MTBE)using EPA Method 8020 for HP4 <br /> groundwater sample from the previous investigation was set at 1,000 µg/l. Detection limits of MTBE <br /> and oxygenates for this work plan must be lowered to the proposed 0.5 to 5.0 µg/I range. .analytical <br /> results of"non-detect"above this range will not be accepted. <br /> 4. Implement proposed work b}-\Iay 1,2003. <br /> REASONS FOR DISAPPROVAL OF THE WORKPLAN(H&S 25299.37,subd.(C)(3).): \une <br /> 1� <br /> DATED March 18,2003 BY <br /> c: RWQCB,Central Valley Region—James L.L.Barton,RG <br /> c: /Condor Earth Technologies—Lee'Morse/Donald Kresse,RG <br />