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QUARTERLY GROUNDWATER MONITORING PROGRAM REPORT SAN JOAQUIN COUNTY MOSQUITO ABATEMENT DISTRICT FIRST QUARTER 1993 1.4 INTRODUCTION This report presents the methodology and results of groundwater sampling performed by Roy F Weston, Inc (WESTON) on behalf of the San Joaquin County Mosquito Abatement District (SJCMAD) at the 200 North Beckman facility in Lodi, California (Figure 1) All work was performed in accordance with the San Joaquin County Environmental Health Division (EHD) Iletters dated June 7, 1991 and February 10, 1992 2.0 GROUNDWATER MONITORING SUMMARY On January 26, 1993, WESTON completed the 1993 first quarter sampling event at the site Only monitor well MW-4 was sampled because wells MW-2 and MW-3 were dry and MW-1 had insufficient water volume for sampling Figure 2 shows the approximate location of the monitor wells The monitoring effort consisted of two tasks 1) field measurement of groundwater physical parameters and 2) the collection and analysis of the water sample for specific analytes A detailed description of the field activities is presented in Appendix A 2.1 Groundwater PhysicaE Fararneters Summary Field measurement of groundwater physical parameters included elevation, temperature, pH, and electrical conductivity These data are presented in Table 1. TABLE 1 Groundwater Physical Parameters First Quarter 1993 January 26, 1993 Well Top of Casing Total Depth DTW` GE3 pH Temperature° Conductivity" ID Elevation' (feet) (OF) (umhos) MW-1 54 11 550 5453 -042 NMS NMS NMS MW-2 5428 528 Dry Dry NM6 NM6 NM6 ' MW-3 5403 51 5 Dry Dry NM6 NM6 NM6 MW-4 5443 695 57 78 -335 7 33 646 360 1 Measured in feet relative to mean sea level (MSL) 2 DTW = Depth to groundwater in feet measured from top of casing 3 GE = Groundwater elevation in feet relative to MSL 4 Measured at end of purge 5 MW-1 contained less than one foot of water, therefore, a sample was not collected 6 NM = Not measured SrhC4RPTSLSJCMAT11 WP