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in KLEIN FELDER <br /> File No 20-3769-01 <br /> January 3, 1995 <br /> Theg roundwater elevations for December 16, 1994 data indicated a groundwater gradient <br /> of approximately 0 0485 ft/ft toward the north/northeast The groundwater flow <br /> direction was found to be consistent with the previous assessment sounding data The <br /> groundwater gradient is slightly steeper compared with previous soundings <br /> Monitoring Well Sampling <br /> A groundwater sample was collected from monitoring well number 3 (MW-3) on <br /> December 16, 1994 The sampling protocol for each monitoring well was as follows <br /> + The depth-to-water was measured using a conductivity-based water-level meter <br /> (protocol described in the previous section) <br /> + The volume of water mallons standing in the well was calculated by subtracting the <br /> g g <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 /> C A transparent single-use disposable bailer was lowered approximately half way into <br /> the surface of the water standing in the well and then withdrawn to check for a <br /> petroleum 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 w1ule 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 /> • Samples were collected after purging by decanting samples from the disposable bailer <br /> directly into bottles provided by the analytical laboratory <br /> • Samples requiring filtration were filtered in-line, directly from the disposable bailers, <br /> using a positive pressure hand pump and a 0 45-micron high capacity field filter <br /> Groundwater samples were decanted directly from the filter attached to the bottom of <br /> the disposable bailer into bottles provided by the analytical laboratory <br /> ETH and WC195 Page 3 of 5 <br /> Copyright 1995 Kleinfelder Inc <br />