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1 QUARTERLY GROUNDWATER MONITORING REPORT SAN JOAQUIN COUNTY HUMAN SERVICES AGENCY ' SECOND QUARTER 1993 ' 1.0 INTRODUCTION On behalf of the San Joaquin County Human Services Agency and San Joaquin County Capitol ' Projects Division, ROY F WESTON, INC (WESTON®) is pleased to submit this quarterly groundwater monitoring report for the second quarter 1993 The program has been mandated by the San Joaquin County Public Health Services Environmental Health Division (EHD) for the ' purpose of determining the distribution of hydrocarbon compounds in groundwater beneath and the vicinity of the Human Services Agency building located at 145 South Sutter Street in downtown Stockton (Figure 1) In addition, the monitoring program provides data on ' groundwater physical parameters of temperature, electrical conductivity and pH, as well as groundwater elevations and flow direction in the area ' 2.0 GROUNDWATER MONITORING SUMMARY A total of seven wells (MW-2 through MW-8) are monitored under this program (Figure 2) ' MW-1 is not part of the monitoring program because it was plugged and abandoned prior to construction of the Human Services building. Monitoring wells MW-2 and MW-3 were originally completed in an upper aquifer zone and have been dry for the past several years These wells continued to be dry during the second quarter monitoring event They will continue to be sounded each quarter and sampled if they are found to contain water In coordination with the City of Stockton's Municipal Utilities Department, the containenzed groundwater stored onsite generated from previous sampling events was released to Stockton's sewer system The monitoring program consisted of two aspects 1) field measurement of groundwater 1 ' physical parameters and 2) collection and analysis of water samples for specific analytes Two quality control samples were also collected One field duplicate sample (coded MW-10) was taken from Well MW-4 as a check on laboratory reproductibility and one sample (coded MW- 11) was taken of equipment decontamination nese water after sampling MW-8 to evaluate the field decontamination procedures A detailed description of the field activities is presented in the attached Field Report, Appendix A I2.1 Physical Parameters Summary I Field measurement of physical parameters consisted of recording groundwater elevation, temperature, pH and electrical conductivity These data are presented in Table 1 I f SPKSR 26/93 I P'['Sl5lC 2ND WP 07 1