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AT&T Lux1l <br /> ATC Project No 75 75128 0001 <br /> Page 4, January 19, 2001 <br /> The wells were developed by surging and bailing until the produced water was relatively free of <br /> sediment, and the pH, temperature and specific conductivity of the purged water had stabilized The <br /> purged water was placed in sealed, properly labeled 55-gallon drums until chemical analysis results <br /> were received and proper disposal could be evaluated <br /> ' 4.3.2 WATER LEVEL MEASUREMENT <br /> Three monitoring wells were sampled during this quarterly monitoring and sampling round The <br /> Iocations of the monitoring wells are presented on Figure 2 The procedure for sampling each of the <br /> monitoring wells consisted of initially measuring the depth to the groundwater surface in each well <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 75' 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 /> decontarrunated <br /> TABLE 4-1 <br /> GROUNDWATER SURFACE ELEVATION <br /> Deccmber 18, 2000 <br /> Momlormg M pth to Depth to C.1 ouudw rti I Lie-.ition of Tap of Groundwater <br />' Well liottoan of Will (Teel) C anml;rol Elevatjonthl <br /> (rest) (feet) (feet) <br /> MW-1 38 33 29 31 3700 769 <br /> MW-2 3803 2940 3701 761 <br /> MW-3 3843 30 19 3773 754 <br /> 01 Bi low top of 1--Stung <br /> (h) El,waho»mhtixe to D-itum 37 t,,t-it MW l <br />' 4.3.3 GROUNDWATER SAMPLING <br /> The groundwater monitoring wells were developed and sampled five days after installation The <br /> volume of water contained in each well was calculated using the depth to water and the known depth <br /> of the bottom of the well Water and sediment in the well was removed by repeatedly lowering a bailer <br /> into the water column to withdraw water until at least five 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 />