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' QUARTERLY GROUNDWATER MONITORING REPORT <br /> SAN JOAQUIN COUNTY HUMAN SERVICES AGENCY <br />' THIRD QUARTER 1993 <br />' 1.0 INTRODUCTION <br /> On behalf of the San Joaquin County Human Services Agency and San Joaquin County Capitol <br />' Protects Division, ROY F WESTON, INC (WESTONa) is pleased to submit this quarterly <br /> groundwater monitoring report for the third quarter 1993. The program has been mandated by <br /> the San Joaquin County Public Health Services Environmental Health Division (EHD) for the <br />' purpose of determining the distribution of hydrocarbon compounds in groundwater beneath and <br /> in the vicinity of the Human Services Agency building located at 145 South Sutter Street in <br /> downtown Stockton (Figure 1). In addition, the monitoring program provides data on <br />' groundwater physical parameters of temperature, electrical conductivity and pH, as well as <br /> groundwater elevations and flow direction in the area <br />' 2.0 GROUNDWATER MONITORING SUMMARY <br /> A total of seven wells (MW-2 through MW-8) are monitored under this program (Figure 2) <br />' MW-1 is not part of the monitoring program because it was grouted and abandoned prior to <br /> construction of the Human Services building. Monitor wells MW-2 and MW-3 were originally <br /> completed in an upper aquifer zone and have been dry for the past several years These wells <br /> continued to be dry during the third quarter monitoring event. WESTON will continue to sound <br /> these wells each quarter and will sample them if they contain water during future monitoring <br /> events <br />' The monitoring program consisted of two aspects- 1) field measurement of groundwater <br /> physical parameters and 2) collection and analysis of water samples for specific analytes. Two <br /> I quality control samples were also collected One field duplicate sample (coded MW-10) was <br /> taken from well MW-8 as a check on laboratory reproducibility and one sample (coded MW-11) <br /> was taken of equipment decontamination nnse water after sampling MW-8 to evaluate the field <br /> decontamination procedures A detailed description of the field activities is presented in the <br /> attached Field Report, Appendix A <br /> I2.1 Physical Parameters Summary <br /> Field measurement of physical parameters consisted of recording groundwater elevation, <br /> temperature, pH and electrical conductivity These data are presented in Table 1 <br /> I <br /> ISYKUMSWC 3RD WP 1 10112197 <br />