Laserfiche WebLink
r <br /> e <br /> WALLACE • KUHL July 16, 1997 <br /> Er ASSOCIATES INC. <br /> " f Mr Harlin Knoll <br /> San Joaquin County Public Health Services <br /> a 304 E Weber Avenue, Third Floor <br /> r <br /> Stockton, California 95201-0388 <br /> GROUNDWATER MONITORING REPORT <br /> GRANITE CONSTRUCTION FACILITY <br /> 10500 South Harlan Road <br /> l French Camp, California 95231 <br /> WKA No 2088 08 <br /> Dear Mr Knoll, r <br /> On behalf of Granite Construction - French Camp, we are submitting this <br /> groundwater monitoring report summarizing our recent work at the above- <br /> referenced site (Plate 1) The purpose of bur work is to comply with quarterly <br /> sampling requirements requested by the Central Valley Regional Water Quality <br /> Control Board (CVRWQCB) and the San Joaquin County Public Health Services <br /> Department (SJCPHS) In addition, we have also attached copies of analytical <br /> } results for water sample of the domestic water well by FGL Environmental <br /> t Analytical Chemists <br /> j On June 20, 1997, groundwater samples were obtained from the four monitoring <br /> wells (MW1 through MW4) Prior to sampling, the wells were checked for visual <br /> signs of free product by using clear, disposable polyethylene bailers When free <br /> product was not observed, the wells were purged and sampled as described in <br /> Appendix A The groundwater samples were analyzed for Total Petroleum <br /> i� Hydrocarbons as garohne (TPH-g) using EPA method 8015 modified and for <br /> Geotechn[Lll Engineering <br /> .• Benzene, Toluene, Ethylbenzene, and Xylenes (BTEX) using EPA method 602 <br /> t <br /> { Engtncenng Geoiovy <br /> -- s Groundwater measurements indicate groundwater flow direction is to the north <br /> Environmental Consulting direction with a hydraulic gradient of approximately 0 004 feet/foot (see Plate 2) <br /> ` A historical summary of the groundwater elevations measured during past sampling <br /> Rcmeddation Services events is summarized in Table 1 <br /> Constru--tion Inspection Laboratory test results`for the water samples obtained from monitoring wells MW 1 <br /> through MW3 revealed a decrease in petroleum hydrocarbons Monitoring wells <br /> M-iterials Testing (MW 1 and MW4) revealed no detectable concentrations of TPH-g or BTEX <br /> ►i Monitoring well (MW2) revealed no detectable concentrations of TPH-g, toluene, <br /> ethylbenzene, and xylenes, however, benzene was detected at 2 8 micrograms per <br /> j liter (µg/1) Monitoring well (MW3) revealed detectable concentrations of TPH_S <br /> l. 3050 lyraustnal Blvd and toluene at 170 µSII and 0 92 Etg/l, respectively No detectable concentrations of benzene, ethylbenzene, or xylenes in MW3 Analytical results of groundwater <br /> Wcst S-WratnCnto <br /> CA 95691 <br /> i <br /> Fax 916 372 2565 <br /> 916 372 1434 <br /> $E,rvr[ed 1Kykr <br />