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QUARTERLY GROUNDWATER MONITORING PROGRAM REPORT <br /> SAN JOAQUIN COUNTY MOSQUITO ABATEMENT DISTRICT <br /> FOURTH QUARTER 1992 <br /> 1.0 INTRODUCTION <br /> This report presents the methodology and results of groundwater sampling performed by Roy <br /> F Weston, Inc (WESTON) on behalf of the San Joaquin County Mosquito Abatement District <br /> (SJCMAD) at the 200 North Beckman facility in Lodi, California (Figure 1) All work was <br /> performed in accordance with the San Joaquin County Environmental Health Division (EHD) <br /> letters dated June 7, 1991 and February 10, 1992 <br /> 2.0 GROUNDWATER MONITORING SUMMARY <br /> On November 2, 1992, WESTON completed the 1992 fourth quarter sampling event at the site <br /> Only monitor well MW-4 was sampled because wells MW-1, MW-2, and MW-3 were dry <br /> (Figure 2) <br /> The monitoring effort consisted of two tasks 1) field measurement of physical groundwater <br /> parameters and 2) the collection and analysis of the water sample for specific analytes A <br /> detailed description of the field activities is presented in Appendix A <br /> 2.1 Physical Groundwater Parameters Summary <br /> Field measurement of physical groundwater parameters included elevation, temperature, pH, and <br /> electrical conductivity These data are presented in Table 1 <br />' TABLE 1 <br /> Fourth Quarter 1992 Groundwater Physical Parameters <br /> Measured at End of Purge <br /> November 2, 1992 <br />' Well ID Casing DTVII GE' pH Temperature Conductiviq} <br /> Elevation' ( F) (umhos) <br />' MW-1 5411 Dry Dry NMS NM NM <br /> MW-2 54 28 Dry Dry NM NM NM <br />' MW-3 5403 Dry Dry NM NM NM <br /> MW-4 S4 43 59 66 -523 79 721 230 <br /> 1 Measured in feet relative to mean sea level (MSL) <br /> 2 DTW = Depth to groundwater in feet measured from top of casing <br /> 3 GE = Groundwater elevation relative to MSL <br />' 4 Measured at end of purge <br /> 5 OF = degrees Fahrenheit <br /> 6 NM = Not measured <br /> ' MCWTSWCMA13-4 WP 11130192 <br />