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FIELD REPORT <br /> QUARTERLY GROUNDWATER MONITORING <br /> SAN JOAQUIN COUNTY MOSQUITO ABATEMENT DISTRICT <br /> LODI FACILITY <br /> On D 1991 ROY F WESTON INC WESTON conducted a monitoring <br /> December 5, ( ) <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 /> TABLE A-1 <br /> WATER LEVEL ELEVATIONS <br /> DECEMBER 5, 1991 <br /> Well Location Well Elevation Depth to Water Water Elevation <br /> (feet, MSL) (feet) (feet, MSL) <br /> MW-1 5411 54 1 001 <br /> MW-2 5428 Dry Dry <br /> MW-3 5403 Dry Dry <br /> Due to insufficient water in MW-2 and MW-3, only MW-1 was sampled during this <br /> 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 /> 1 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 1 112 <br />' well volumes) was removed from the well The well was allowed to recover prior to <br /> sample collection <br />' 01!13!92 <br /> RPTSISICMlAD WP <br />