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PUBLIC TiEALTH SERVICES <br /> SAN JOAQUIN COUNTY U-' 6i ENVIRONMENTAL HEALTH DIVISIONKaren Furst, M.D., M.P.H., Health Officer <br /> 304 East Weber Avenue,Third Floor - Stockton, CA 95202 <br /> 2091468-3420 FILE C <br /> KAY HUGGINS <br /> NEW JERUSALEM SCHOOL SEP 081998 <br /> 31400 ROSTER RD <br /> TRACY CA 95375 <br /> Re: New Jerusalem School Site Code: 1971 <br /> 31400 Koster Rd. <br /> Tracy, CA 95376 <br /> San Joaquin County Public Health Services Environmental Health Division(PHS/EHD) <br /> has reviewed the Preliminary Investigation and Evaluation Report for the above site. The <br /> results of this investigation indicate contamination of soil and water at this site. Further <br /> investigation is required by PHS/EHD to determine the vertical and lateral extent of <br /> contamination. <br /> Further investigation should include advancing borings to a depth necessary (two <br /> consecutive five foot intervals of no detectable contamination), near the tank area in order <br /> to evaluate the vertical extent of contamination. Soil samples should be obtained at every <br /> five foot interval and at every significant lithological change in the soil. <br /> At least three Monitoring Wells (MWs) should be installed and screened at an interval <br /> representative of the affected groundwater. The water from these MWs should be <br /> analyzed for Benzene, Toluene, Ethylbenzene,Xylenes (BTEX) and Total Petroleum <br /> Hydrocarbons as gasoline (TPH-g) using EPA Method 8020. Groundwater samples <br /> should also be analyzed for Ethyl Tertiary Butyl Ether(ETBE), Tertiary-Butyl Alcohol <br /> (TBA), Methyl Tertiary Butyl Ether(MTBE), Di-isopropyl ether(DIPS) and Tertiary <br /> Amyl Methyl Ether(TAME) by EPA Method 8260 (see attached letter). <br /> A water sample should be collected from the domestic well and the agricultural well <br /> located on this site and analyzed using EPA Method 524.2 for the above contaminants. <br /> Conduct a receptor survey of domestic, municipal, agricultural, industrial and any other <br /> wells within a 2,000 foot radius of this site. Contact the Department of Water Resources, <br /> municipal suppliers and any nearby industries to search for wells. Perform a physical <br /> search of the area to locate wells or other receptor risks. Show the locations of all wells, <br /> provide any known construction details and evaluate any pumping influence with respect <br /> to the possibility of contaminant migration and public and/or environmental health <br /> threat. <br /> A Division of San Joaquin County Health Care Services <br />