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ATaT - Lodi, Quarterly Groundwater Monitoring Report No 2 <br /> ATC Project No 75 75128 0001 <br /> Page 3, May 4, 2001 <br /> utilizing a decontaminated Solinst Model 101 flat tape electrical water level meter Groundwater <br /> surface depth was determined to the nearest 0 01 foot and referenced to the top of casing (TOC) for <br /> each well Groundwater elevations were determined from an arbitrary datum of 37 feet, the <br /> approximate surface elevation of the site based on the USGS Lodi North 7 5' Quadrangle 1967 <br /> (photorevised 1980) Table 4-1 lists the date of the sounding and the groundwater surface elevations <br /> Before use and prior to subsequent measurements in each well, the measuring equipment was field <br /> decontaminated <br /> TABLE 4-1 <br /> GROUNDWATER SURFACE ELEVATION <br /> March 28,2001 <br /> Monitoring Date Depth to Depth to Elevation of Top of Groundwater <br /> Well Bottom of Well Groundwater') Casing(b} Elevation(b) <br /> (feet) (feet) (feet) (feet) <br /> MW-1 12/18/00 3833 2931 3700 769 <br /> r3/28101 3031 669 <br /> MW-2 12/18/00 3803 2940 3701 761 <br /> 3128101 3039 6.62 <br /> IJ <br /> 12/18/00 3843 30 19 3773 754 <br /> 3128101 1 3118 655 <br /> Below top of c asmg <br /> s� Elevation relative to Datum 37 feel 1t MW 1 <br /> 1 <br /> 4.2.2 GROUNDWATER SAMPLING <br /> Theg roundwater monitoring wells were purged prior to sampling The volume of water contained in <br /> each well was calculated using the depth to water and the known depth of the bottom of the well <br /> Water and sediment in the well was removed by repeatedly lowering a bailer into the water column to <br /> withdraw water until at least three well-casing volumes had been removed <br /> The color, clarity, turbidity, pH, temperature, and specific conductance of the water removed from <br /> these wells were recorded during the purging Table 4-2 lists the stabilized parameters Discharge <br /> water was contained In sealed, properly labeled 55-gallon drums until laboratory analytical results were <br /> received to guide disposal <br /> Following the purging and recovery of the wells, water samples were collected with a disposable <br /> polyethylene bailer The bailer was lowered into the center of the water column using a new nylon <br /> rope Upon retrieval of the bailer, sample containers were filled using the bailer's disposable <br /> polyethylene bottom-emptying device <br />