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QUARTERLY GROUNDWATER MONITORING PROGRAM REPORT <br /> FOURTH QUARTER 1991 <br /> 1.0 INTRODUCTION <br /> On behalf of San Joaquin County Mosquito Abatement District (SJCMAD), and in <br /> response to requests outlined in the June 7, 1991 letter to SJCMAD, ROY F WESTON, <br /> INC (WESTON) is submitting this quarterly monitoring report for the fourth quarter <br /> 1991 <br /> 2.0 GROUNDWATER MONITORING SUMMARY <br /> On December 5, 1991, WESTON conducted a monitoring program of the three <br /> groundwater monitoring wells at the SJCMAD Lodi facility (Figure 1) The monitoring <br /> program was to consist of two aspects <br /> 1 Field measurement of groundwater elevation, temperature, pH, and electrical <br /> conductivity. <br /> 2 Collection of groundwater samples for analysis of Total Petroleum Hydrocarbons <br /> as Gasoline (TPH-G) by EPA Method 8015 (modified) and Benzene, Toluene, <br /> Ethylbenzene, and Xylene (BTEX) by EPA Method 8020 <br /> On this monitoring occasion, only MW-1 contained enough water to sample, MW-2 and <br /> MW-3 were dry Table 1 presents the field physical parameter measurements and the <br /> analytical results for MW-1 are summarized in Table 2 Appendix A presents a detailed <br /> description of WESTON's field activities and the complete Analytical Report is presented <br /> in Appendix B <br /> RPf'SISJCMAD WP <br /> 61/13/92 <br />