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excavation Of the soil removed, 700 cubic yards were placed into "contaminated" stockpiles <br /> and 300 cubic yards were placed into "clean" stockpiles. Groundwater was encountered in <br /> the excavation at a depth of approximately 12 feet. <br />' Petroleum hydrocarbons were detected in the north wall of the excavation at concentrations <br /> of 350 ppm (TPH as gasoline) and 160 ppm (TPH as diesel) Petroleum hydrocarbons were <br /> also detected in the east wall of the excavation. <br /> On September 7 and 8, 1993, under the direction of the PHS/EHD, the "clean" stockpiles <br /> were used to partially backfill the excavation The soil was placed into the excavation and <br /> compacted using a loader/backhoe <br /> I2.8 Disposal of Hydrocarbon Impacted Soil <br /> The stockpiled soil was characterized for disposal and transported under non-hazardous <br />' waste manifest to Forward, Inc in Stockton, California Analytical results of the soil <br /> characterization and copies of the non-hazardous waste manifests were included in the <br /> March 1994 Quarterly Report prepared by GeoAudit <br /> I2.9 Excavation Backfilling <br /> On December 31, 1993, the excavation was backfilled to surface grade Pea gravel was <br /> Imported and used as fill material Backfilling of the excavation was performed by StokIey <br /> Construction of Tracy, California <br /> I3.0 PROCEDURES <br /> 3.1 Monitoring Well Purging <br /> On September 9, 1994, the water level in each well was measured relative to the top of the <br /> casing using a Solxnst water level meter (Table 1) No free hydrocarbon product was <br />' observed in any of the wells <br /> After water levels were measured, a submersible pump was used to remove standing water <br />' from each well. Approximately 5 gallons of water were removed from each well to stabilize <br /> temperature, pH and conductivity (Appendix A) Groundwater parameters were measured <br /> at one-gallon intervals using an ICM water analyzer The purge water was stored in 55- <br /> gallon drums on-sate All purging equipment was washed in an alconox solution and rinsed <br /> twice after each well was purged <br />' 3.2 Sample Collection and Analysis <br /> Water samples were collected from each well using disposable plastic bailers Each sample <br /> Geological Audit Services,Inc. <br /> MWARTS BEACON QR5/661-S/10 94 5 <br />