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FILE COPY <br /> ENVIRONMENTAL HEALTH DEPARTMENT <br /> Q <br /> SAN JOAUIN COUNTY <br /> Unit Supervisors <br /> ,. Donna K.Heran,R.E.H.S. Carl Born,n R.E.H.S. <br /> Director 304 East Weber Avenue,Third Floor � <br /> At Olsen,R.E.H.S. Stockton, California 95202-2708 Mike Huggins, sonS.,R.D.I. <br /> -. Douglas W.Willson,,R.E.H.S. <br /> • cq `P. Program Manager Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> Laurie A.Cotulla,R.E.H.S. Robert McClellon,R.E.H.S. <br /> Program Manager Fax: (209) 464-0138 Mark Barcellos,R.E.H.S. <br /> D CHARLES SKOBRAK APR 2 5 2003 <br /> 9947 EAST HIGHWAY 26 <br /> STOCKTON CA 95215 <br /> RE: Larry's Auto SITE CODE 1122 <br /> 308 North Grant Street RO: 194 <br /> Stockton, CA 95202 <br /> San Joaquin County Environmental Health Department (EHD) has reviewed the reports <br /> submitted for the 1997 through September 2002 quarterly groundwater monitoring events; <br /> soil and groundwater analytical results;boring and monitoring well lithologies; and vertical <br /> profiles for gasoline in 2001, prepared by Advanced GeoEnvironmental, Inc. (AGE) for the <br /> above referenced site. Of concern are the high concentrations of contaminants found at this <br /> site,the probable migration of these contaminants, and the locations of well screen <br /> intervals below the groundwater levels. <br /> EHD has not received the findings for the cone penetrometer test(CPT) conducted on 13 <br /> and 15 November 2001. Also EHD has not received the fourth quarter groundwater <br /> monitoring event report for 2002,nor the first quarter groundwater event for 2003. Please <br /> submit these reports by 23 May 2003. <br /> A site conceptual model (SCM) should be prepared for this site. The SCM should <br /> include the following: <br /> 1. Local and regional plan view maps showing location of sources, extent of <br /> contamination, direction and estimated rate of groundwater flow, and locations of <br /> receptors. "Receptors" include,but are not limited to, all water supply wells <br /> within 2000 feet of the source area; <br /> 2. Cross-sections showing the subsurface hydrogeologic framework of the site, <br /> depth of groundwater,man-made conduits,monitoring well construction, and an <br /> interpretive drawing of the vertical extent of soil contamination; <br /> 3. Plots of key chemical concentrations vs. time (e.g., plots should be shown for <br /> monitoring wells that demonstrate significant trends in contaminant <br /> concentrations); <br />