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je T <br /> ENVIRONMENTAL HEALTH DEPARTMENT <br /> SAN JOAQUIN COUNTY <br /> r-.. Unit Supervisors <br /> Donna K. Heran, R.E.H.S. Carl Bor an, R.E.H.S . <br /> h. < <br /> Director 304 East Weber Avenue, Third Floor <br /> ' Al Olsen, R.E.H.S. Stockton, California 95202-2708 Mike Huggins, R.E.H. R.D.I. <br /> Douglas W. Wilson, R..E.H.S. <br /> • 6q. , . , .��P Program Manager -3420Telephone: (209) 468 Margaret Lagorio, R.E.H.S. <br /> 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 /> PAUL ZUMBERGE APR 0 2 2003 <br /> FRONTIER TRANSPORT INC <br /> 3577 W PHILADELPHIA STREET <br /> CHINO CA 91710 <br /> RE: Frontier Transport, Inc. SITE CODE 2251 <br /> 425 Larch Road RO : 252 <br /> Tracy, CA 95376 <br /> San Joaquin County Environmental Health Department (EHD) has reviewed the reports <br /> submitted for the 1996 through 2002 quarterly groundwater monitoring events; soil and <br /> groundwater analytical results; boring and monitoring well lithologies; cross-sections <br /> prepared in 1999, and the well receptor survey report prepared by Blakely Environmental <br /> Investigations, Ina (BEII) for the above referenced site. Further site investigation is <br /> necessary to evaluate the lateral extent of impacted groundwater in the sand encountered <br /> at forty feet below surface grade (bsg). EHD recommends a third monitoring well in the <br /> deeper monitored interval near monitoring well MW-I to assess the vertical and lateral <br /> extent of impacted groundwater in that direction. <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 (i.e., an interpretive drawing - not merely a plot of laboratory <br /> results), direction and rate of groundwater flow, and locations of receptors. <br /> "Receptors" include, but are not limited to, all supply wells within 2000 feet of <br /> the source area; <br /> 2. Cross-sections showing the subsurface geologic framework of the site, depth of <br /> 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 /> 4. Summary tables of chemical concentrations in the two media of concern; <br />