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I <br /> PUBLIC HEALTH SERVICES ,aP�lN <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION " <br /> Karen Furst, M.D . , M.P.H., Health Officer <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 9520 <br /> 209/468-3420 ' I L E COPY Y 0 P Y <br /> BOB MAF'ORD <br /> FRONTIER TRANSPORT DEC 18 1998 <br /> 3577 PHILADELPHIA <br /> CHINO CA 91710 <br /> Re : Frontier Transport Inc. Site Code: 251 <br /> 425 Larch Rd. <br /> Tracy, CA <br /> San Joaquin County Public Health Services Environmental Health Division (PHS/EHD) <br /> has reviewed the Quarterly Monitoring Report (QMR) for October 16, 1998, prepared by <br /> Blakely Environmental Investigations, Inc. , for the above referenced site. <br /> In the next QMR provide a cross sectional depiction of the site showing all monitoring <br /> wells, well screen intervals, current groundwater level and concentrations of <br /> contaminants as they correspond with depth and lithology. In future QMRs show <br /> previous underground tank locations on all site maps and provide a current rose gradient <br /> diagram with each report. <br /> For all future sampling events, measure the distance from surface grade to static <br /> groundwater level in each well prior to purging and again prior to sample collection. <br /> This is required in order to verify the groundwater level has recovered to 80% of the <br /> initial depth after purging and before sampling . All monitoring wells should be purged <br /> and the groundwater samples collected from them during the same day. Samples should <br /> be stored in an insulated ice chest cooled with ice to ensure that they achieve a holding <br /> temperature of 4 degrees Celsius. <br /> Conduct a survey of domestic, municipal, agricultural, industrial and any other wells <br /> within a 2,000 foot radius of this site. Contact the Department of Water Resources, <br /> municipal water suppliers and nearby industries for well information. In addition, <br /> perform a physical search of the area to identify any wells. Show the locations of all <br /> wells on a map with appropriate scale showing the site and clearly marked 2000 foot <br /> radius . Submit any known construction details of the wells (if available) and evaluate <br /> the influence of well pumping with respect to the migration of the contamination from <br /> this site. <br /> Continue quarterly sampling and analyze samples for Benzene, Toluene, Xylene. <br /> Ethylbenzene, using EPA Method 8020 , Total Petroleum Hydrocarbon as gas and Total <br /> Petroleum Hydrocarbon as diesel using EPA Method 8015m. Also, analyze samples for <br /> A Division of San Joaquin County Heahh Care Services <br />