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11 May 1998 <br /> AGE-NC Project No 97-0312 <br /> Page 3 of 5 <br /> TPH-g, TPH-d,BTE&X and MTBE TPH-g and TPH-d were detected in the soil stockpile samples <br /> at concentrations as high as 1,500 ppm and 4,100 ppm, respectively Stockpile sampling was <br /> summarized the Quarterly Report -December 1997 <br /> 3 0. PROCEDURES <br /> 3 1 MONITORING WELL PURGE PROCEDURES <br /> On 11 March 1998, a Solinst water level meter was used to measure the depth to ground water in <br /> five monitoring wells at the site relative to the tops of the well casings The ground water elevation <br /> in each well and hydraulic gradient were determined from these data (Table 1) <br /> After measuring ground water depths, monitoringwells UST-1 through UST-5 were purged using <br /> a Grundfos submersible purge pump Approximately 100 gallons of water was removed from UST- <br /> 1, approximately 10 to 15 gallons of water were removed from UST-2 through UST-5 (a minimum <br /> of three well volumes for each well) Temperature, pH and conductivity of purged water were <br /> measured at regular Intervals during purging using an ICM model 52200 water analyzer Monitoring <br /> well stabilization data and field sheets are Included in Appendix A Purged water was stored on-site <br /> in 55-gallon DOT drums pending Iaboratory analyses <br /> 32 COLLECTION OF GROUND WATER SAMPLES <br /> Water samples were retrieved from each purged well using new disposable bailers Each sample was <br /> transferred into 40-m1 EPA-approved VOA vials containing 0 5 ml of 18% hydrochloric acid as a <br /> preservative and into one I-liter amber bottle without preservative The samples were labeled,placed <br /> in a chilled container and transported to McCampbell Analytical, Inc (MAI) in Pacheco, California <br /> The samples were analyzed in accordance with EPA Methods 5030 and 8015m for TPH-g and TPH- <br /> d,in accordance with EPA Method 602 for BTE&X and MTBE and In accordance with EPA Method <br /> 8260 for volatile organic compounds with oxygenated compounds <br /> 3 3 STOCKPILE SOIL DISPOSAL/EXCAVATION BACKFILL <br /> The stockpiled soil was previously characterized in November 1997 On 16 March 1998, 241 tons <br /> of soil (approximately 180 cubic yards) were transported to Forward, Inc for disposal Load weight <br /> sheets are Included in Appendix C Clean fill material was Imported to backfill the excavation to a <br /> depth of approximately 7 feet below surface grade (bsg) Two compaction tests were performed by <br /> Arrowhead Consultants at a depth of approximately 7 feet bsg The remaining stockpiled soil was <br /> Advanced GeoEn%ironmcntal,Inc <br />