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r <br /> WALLACE • KUHL February 16, 1999 <br /> &ASSOCIATES INC. w - ] <br /> Mr Harlin Knoll <br /> San Joaquin County Public Health Services <br /> 304 E Weber Avenue, Third Floor <br /> Stockton, California 95201-0388 <br /> Groundivater Monitoring and Sampling Report <br /> GRANITE CONSTRUCTION FACILITY <br /> 10500 South Harlan Road <br /> French Camp�California 95231 <br /> WKA No 2088 08 <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 our work is to comply with quarterly <br /> sampling requirements requested by the Central Valley Regional Water Quality <br /> f� Control Board (CVRWQCB) and the San Joaquin County Public Health Services <br /> Department (SJCPHS) <br /> fl� On December 17, 1998, groundwater samples were obtained from the four <br /> monitoring wells (MW1 through MW4) Prior to sampling, the wells were <br /> a checked for visual signs of free product by using clear, disposable polyethylene <br /> bailers When free product was not observed, the wells were purged and sampled <br /> as described in Appendix A The groundwater samples were analyzed for Total <br /> Geotechnical Engineering Petroleum I-Iydrocarbons as Gasoline (TPH), Benzene, Toluene, Ethylbenzene, <br /> i <br /> and Total Xylenes (BTEX), and the oxygenate compounds Methyl Tert-Butyl <br /> Ether(MTBE), DnPPy1 ether so ro (DIPS), Ethy 1-t-buty ether 1 eth (ETBE) -amy, Teri-amyl <br /> Engineering Geology i <br /> s� methyl ether (TAME), and Tert-Butanol using EPA Method 8260B <br /> Environmental Consulting <br /> Groundwater measurements obtained from wells MWI through MW8 indicate <br /> ReIDLdlat]on Sen ices groundwater flow direction is to the southwest with a hydraulic gradient of <br /> approximately 0 001 feet/foot (see Plate 2) A summary of groundwater elevations <br /> { ' Construction Inspection <br /> measured during past sampling events is resented in Table 1 <br /> S Marenals Testing Laboratory test results for the water samples obtained from monitoring wells <br /> MWI, MW2, and MW4 revealed no detectable concentrations of TPH as gasoline, <br /> BTEX, or oxygenate compounds at or above the laboratory method detection limit <br /> However, detectable concentrations of TPH as gasoline (68 µg/1) and Tert-Butanol <br /> 30501ndustrial Blvd (14 µg/1 ) were detected in the water sample obtained from MW3 BTEX and the <br /> Iother oxygenate compounds were not reported in MW3 at or above laboratory <br /> WentSacr�mcnto method detection limits <br /> CA 95691 <br /> 916 372 1434 <br /> Fix 916 372 2565 <br /> RecyciM paper <br />