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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 150 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 /> 2.9 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 Stokley <br /> Construction of Tracy, California <br />' 3.0 PROCEDURES <br />' 3.1 Monitoring Well Purging <br /> On June 14, 1994, the water level in each well was measured relative to the top of the casing <br />' using a Solinst water level meter (Table 1) No free hydrocarbon product was observed in <br /> any of the wells <br />' After water levels were measured, a submersible pump was used to remove standing water <br /> from each well All purging equipment was washed in an alconox solution and rinsed twice <br /> after each well was purged <br />' Between 4 and 8 gallons of water were removed from each well to stabilize temperature, pH <br /> and conductivity (Appendix A) Groundwater parameters were measured at one-gallon <br /> intervals using an ICM water analyzer The purge water was stored in 55-gallon drums on- <br /> site <br /> I <br /> peoh�wl And.Semcsa �. 5 <br /> 661 SdSTEWARI'S BEMUN 4R 694 <br />