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Environmental <br /> s , <br /> Resources <br /> Management <br /> 1777 BOtelll0 Drive <br /> 99 SLEP 17 All 11 37 Suite 260 <br /> 21 September 1998 Walnut Creek,CA 94596 <br /> (925)946-0455 <br /> (925)946-9968(Fax) <br /> Mr Harlin Knoll, Senior REHS <br /> Public Health Services <br /> San Joaquin County <br /> Environmental Health Division <br /> 304 East Weber Avenue, Third Floor ERM. <br /> Stockton, California 95202 <br /> SY JBJECT Ground Water Sampling Results <br /> Former Heinz Facility, Tracy, CA <br /> Dear Mr Knoll <br /> As you are aware, Environmental Resources Management (ERM), on behalf of <br /> the H J Heinz Corporation (Heinz), has been collecting ground water samples <br /> from two monitoring wells (MW-1 and MW-2) at the former Heinz facility in <br /> Tracy, California These two wells were installed downgradient of two former <br /> underground storage tank (UST) locations to monitor the presence of residual <br /> chemicals present in ground water following removal of the tanks and associated <br /> impacted soils <br /> As stated in the 22 May 1998 letter summarizing UST closure activities, ERM, on <br /> behalf of Heinz, agreed to conduct sampling in MWA and MW-2 to document <br /> that the concentrations of total petroleum hydrocarbons as gasoline (TPH-g) and <br /> benzene, toluene, ethyl benzene, and xylenes (BTEX) compounds are remaining <br /> stable or decreasing As stated in the 22 May 1998 letter, if the sampling results <br /> indicate that the concentrations of TPH-g and BTEX are static or decreasing, the <br /> plume v,ouid be considered stable and Heinz would subrnit a request for .71tC <br /> closure, based on low risk, to the County <br /> The results of ground water samples collected from the two wells on 1 May, <br /> 2 June, 15 July, and 10 September 1998 are presented in Table 1 (attached) As <br /> shown, the concentrations of TPH-g and BTEX compounds have consistently <br /> decreased between 1 May 1998 and 10 September 1998 in both wells In well <br /> MW-1, TPH-g concentrations have decreased from 7,400 µg/l to 2,000 µg/l and <br /> benzene concentrations have decreased from 53 µg/1 to 22 µg/l during this time <br /> period In well MW-2, TPH-g concentrations have decreased from 31,000 µg/1 to <br />