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i16 Creek included in Appendix 2 Based on this data, the historic groundwater flow direction beneath the site has varied from the northeast to the southeast, the calculated hydraulic k , gradient has ranged from 0 002 to 0 005 ft/ft 1.4.4 Soil Stockpile and Purge Water Disposal ' The volume of soil originating from the g g excavation was approximately 100 cubic yards and � had been sitting at the site since 1977 On November 9, 1995 Ground Zero spread the soil stockpile at the site using a backhoe and collected two composite soil samples Soil samples were submitted under chain-of-custody to Argon Labs of Ceres, California and analyzed for TPHg and BTEX Gasoline hydrocarbons were not detected in the confirmation samples 4 , collected from the soil stockpile Laboratory analytical reports and chain-of-custody records are included in Appendix 8 On November 9, 1995 Ground Zero removed the soil cuttings from 30 drums stored at the site The soil cuttings in the drums was derived during the investigations described in the previous work section of this report The drums were removed from the site and recycled ' Ground Zero removed soil from the drums and placed it on visqueen and covered it Soil samples will be collected from the soil during backfilling activities The samples will be sent ' to Argon Labs for profiling for disposal at Forward Landfill On November 9, 1995 development and purge water generated during the investigations described in the previous work section of this report and during work performed by Ground Zero was manifested and transported to Enviropur West, of Patterson, California for disposal Manifests are included in Appendix 9 1.45 Excavation Clean-Out and Backfilling On November 7, 1995 Ground Zero removed vegetation and debris from excavation into a 20 yard roll-off bin The bin was removed from the site on November 21, 1995 and transported to Forward Landfill for disposal as nonhazardous material If the permits are received by Ground Zero, the excavation will be backfilled and compacted during the week of December 4, 1995 Ground Zero will use approximately 85 cubic yards of soil from the onsite stockpile for backflling 2.0 SITE CHARACTERIZATION I k ,� 2.1 Regional Geology and Hydrogeology � Regionally the site is located in the San Joaquin Valley physiographic province The valley is a topograpluc and structural basm bounded on the east by the Sierra Nevada and on the west by the Coast Ranges Locally the topography slopes gently toward the southwest at approximately 6 feet per mile ground7clroek`cap 5