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v <br /> ON <br /> ,a <br /> FIELD REPORT <br /> QUARTERLY GROUNDWATER MONITORING <br /> SAN JOAQUIN COUNTY MOSQUITO ABATEMENT DISTRICT ' <br /> LODI FACILITY <br /> On December 5, 1991, ROY F, WESTON, INC. (WESTON) conducted a monitoring <br /> program of three groundwater monitoring wells located at the San Joaquin County <br /> Mosquito Abatement District (SJCMAD) facility at 200 North Beckman Road, Lodi, <br /> California. This field work was conducted to meet the requests of the San Joaquin <br /> County Public Health Services, Environmental Health Division (PHS/EHD). <br /> - On arrival at the site, measurements of standing water level were taken in all wells <br /> utilizing an electronic well sounding device, Two of the wells, MW-2 and MW-3, were <br /> dry. Calculations to determine the Mean Sea Level (MSL) elevation of groundwater in <br /> MW-1 were made and the results are presented in Table A-1. <br /> ley <br /> TABLE A-1 <br /> WATER LEVEL ELEVATIONS <br /> r DECEMBER 5, 1991 <br /> ,r- <br /> c- Well Location Well Elevation Depth to Water Water Elevation <br /> (feet, MSL) (feet) (feet, MSL) <br /> � w <br /> e <br /> MW-1 54.11 54.1 0.01 <br /> MW-2 54.28 Dry Dry <br /> r=t MW-3 54.03 Dry Dry <br /> t'4 <br /> Due to insufficient water in MW-2 and MW-3, only MW-1 was sampled during this <br /> i monitoring period. Prior to collecting samples at MW-1, the total well depth was <br /> !, measured. Using this measurement and the depth to water, the standing water volume <br /> within the casing was calculated to determine the necessary purge volume. <br /> t It was desired that a minimum of three well casing volumes be removed from each well <br /> prior to sampling, but MW-1 was bailed dry after approximately one gallon (or 1 1/2 <br /> t well volumes) was removed from the well. The well was allowed to recover prior to <br /> sample collection. <br /> 3F <br /> tin <br /> t9� Rp'tS5lCAlM.RP - OIf13N7 - _ <br /> 5,n' <br />