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h <br />' 12 February 1996 <br /> AGE-NC Project No 95-0121 _ <br />' Page 2 of 4 <br />' 23 SITE ASSESSMENT <br /> Between May 1989 and December 1994, a total of ten soil bonngs and nine monitoring wells were <br />' drilled and installed at the site to assess the lateral and vertical extent of hydrocarbon-impacted soil <br /> and ground water Details of the assessment of hydrocarbon-impacted soil and ground water were <br /> included in the Corrective Action Plan (CAP) prepared by AGE in November 1995 <br /> 2 4 GROUND WATER DEPTH AND FLOW DIRECTION <br /> IGround water depth at the site has fluctuated from approximately 25 feet to approximately 33 feet <br /> below,surface grade between 1991 and 1995 Ground water flow direction at the site has fluctuated <br /> Ifrom northwest to southeast Current ground water flow direction is north-northeast <br />' 3.0. PROCEDURES <br /> 3 1 MONITORING WELL PURGE PROCEDURES <br /> On 28 November 1995, a Solinst water level meter was used to measure the depth to ground water <br /> in each monitoring well relative to the top of the well casing An Ullage interface probe was used to <br /> measure free hydrocarbon product in wells MW-1, MW-2 and MW-3 <br /> I After measuring the ground water depth and free product thicknesses, each well was purged using <br /> a 2-stage submersible purge pump Approximately 8 to 14 gallons (a minimum of 3 well volumes) <br /> of water were removed from each well to stabilize temperature, pH and conductivity Stabilization <br /> I parameters were measured at regular intervals using an ICM water analyzer Purged water was placed <br /> in 55-gallon drums for temporary storage on-site Monitoring well stabilization data and field sheets <br /> are included in Appendix A <br /> 3 2 - COLLECTION OF GROUND WATER SAMPLES <br /> Ground water samples were collected from each well using new disposable bailers Immediately upon <br /> retrieval, the samples were transferred into 40-m1 EPA vials preserved with hydrochloric acid and <br /> Ione-liter amber bottles and transported in a chilled container to Western Environmental Science and <br /> Technology (WEST) in Davis, California The samples,were analyzed for total petroleum <br /> hydrocarbons as `gasoline and diesel (TPH-g, TPH-d) and volatile organics (benzene, toluene, <br /> ethylbenzene and total xylenes (BTE&X) in accordance with EPA methods 8015m and 602, <br /> respectively <br />