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File No 20-3769-0I KLE1NFELDER <br /> December 14, 1995 <br /> The groundwater elevations for October 31, 1995 data indicated a groundwater gradient of <br /> approximately 0 04 ft/ft toward the north/northeast The groundwater flow direction was found <br /> to be consistent with the previous assessment sounding data The groundwater gradient was found <br /> to be greater by 014 ft/ft than during March, 1995 soundings <br />' Monitoring Well Sampling <br /> Groundwater samples were collected from monitoring well numbers MW-1, MW-2, and MW-3 on <br />' October 31, 1995 The sampling protocol for each monitoring well was as follows <br /> • The depth-to-water was measured using a conductivity-based water-level meter (protocol <br /> described in the previous section) <br /> • The volume of water in gallons standing in the well was calculated by subtracting the depth-to- <br /> groundwater measurement from the known depth to the well bottom and multiplying by the <br /> cross-sectional inside area of the well casing <br />' • 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 surface of the water standing in the well and then withdrawn to check for a petroleum layer or <br /> sheen on the water <br /> o A minimum of three well volumes of water was then purged from each well using a single-use <br /> disposable bailer A new disposable bailer was used to purge and sample each well <br /> o Electncal conductivity,pH, and temperature were monitored while purging The water quality <br /> measurements were recorded on purge-and-sample logs along with the time and volume of <br /> water purged at each measurement The pH meter was calibrated per the manufacturer's <br /> directions prior to purging each well <br />' • Samples were collected after purging by decanting samples from the disposable bailer directly <br /> into bottles provided by the analytical laboratory <br />' a Samples requiring filtration were filtered in-line, directly from the disposable bailers, using a <br /> positive pressure hand pump and a 0 45-nucron high capacity field filter <br /> Groundwater samples were decanted directly from the filter attached to the bottom of the <br /> disposable bailer into bottles provided by the analytical laboratory <br /> A record of the field parameter readings obtained are listed on the Purge Characterization and <br /> Sample Log, copies of which are provided in Appendix A <br /> t <br /> IflU50043 Page 2 of 4 91995,Kleinfelder,Inc <br />