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File No 20-3769-01 k" KLEINFELDER <br /> May 18, 1995 <br /> • <br /> Groundwater Levels <br /> The depth to groundwater was measured in the three monitoring wells with an electrical <br /> conductivity-based water level indicator on March 31, 1995 The water level probe was <br /> decontaminated in a tnsodium phosphate (TSP) wash followed by a distilled water rinse, <br /> prior to use in each well Measurements were made to the surveyed mark on the north <br /> nm of the monitoring well PVC casings Measurements were made to the nearest 0 01 <br /> foot The water level measurements were converted to elevations using the surveyed <br /> casing elevations The PVC casing elevations, depth to water measurements, and <br /> calculated groundwater surface elevations are presented in Table 1 <br /> The groundwater elevations for March 31, 1995 data indicated a groundwater gradient of <br /> approximately 0 026 ft/ft toward the north/northeast The groundwater flow direction <br /> was found to be consistent with the previous assessment sounding data <br /> Monitorin2 Well Samplinji <br /> • A groundwater sample was collected from monitoring well number 3 (MW-3) on March <br /> 31, 1995 The sampling protocol for each monitoring well was as follows <br /> o The depth-to-water was measured using a conductivity-based water-level meter <br /> (protocol described in the previous section) <br /> o The volume of water in gallons standing in the well was calculated by subtracting the <br /> depth-to-groundwater measurement from the known depth to the well bottom and <br /> multiplying by the cross-sectional inside area of the well casing <br /> a A transparent single-use disposable bailer was lowered approximately half way into the <br /> surface of the water standing in the well and then withdrawn to check for a petroleum <br /> layer or sheen on the water <br /> © A minimum of three well volumes of water was then purged from each well using a <br /> single-use disposable bailer A new disposable bailer was used to purge and sample <br /> each well <br /> Electrical conductivity, pH, and temperature were monitored while purging The <br /> water quality measurements were recorded on purge-and-sample logs along with the <br /> time and volume of water purged at each measurement The pH meter was calibrated <br /> . per the manufacturer's directions prior to purging each well <br /> DH and WC195 Page 2 of 9 May 18, 1995 <br /> 20-3769-01 01995,Kleinfelder,Inc <br />