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APPENDIX BRISK BASED CORRFCTME ACHON TIER I AND TIER 2 ANALYSIS, <br /> SPIE CLOSURE EVALUATION REPORT <br /> Former Beacon Station No 695 <br /> 900 South Cherokee Lane <br /> Lodi, Califor ua <br /> Delta Project No D093-915 <br /> Page 3 <br /> drilled and sampled sic additional soil borings to assess the effectiveness of the site's SVE system to <br /> remove petroleum hydrocarbons from the vadose zone, and to evaluate if further site remediation is <br /> warranted Results of the investigation are included in Delta's report entitled, Soil Borings Results <br /> Report, dated May 21, 1996 <br /> 2.3 Site„Geology <br /> The site is located in the Northern San Joaquin Valley Basin which is an asymmetric synclinal trough <br /> containing Jurassic to Holocene sedunentary rocks and sediments These sediments reach a maximum <br /> thickness of approximately 33,000 feet m the San Joaquin Valley (Repemmng, 1960) <br /> The soil impacted with petroleum hydrocarbons are wets of the Victor Formation According to the State <br /> of California Department of Water Resources (DWR), (1967) the Victor Formation is of Quaternary age, <br /> up to 150 feet thick and consists of recent alluvium and, alluvial fan and flood plain deposits The Victor <br /> Formation is heterogeneous with no extensive clay layers to act as confining layers The Victor <br /> Formation consists of sand and gravel deposits in the fan areas, while clay, silt, and sand occur in the <br /> interfan areas The material is derived from volcanic, granitic, and metamorphic sources in the Sierra <br /> Nevada range to the east The proceeding description is a consistent description of the soil encountered <br /> in the borings drilled at the site <br /> 2.4 Site Hvdroaeoloay <br /> The following bodies of surface water are located near the site the Mokelumne River, approximately 17 <br /> miles to the north, Pixely Slough, located 3 5 miles to the south, Bear Creek, Iocated approximately 4 2 <br /> miles to the south <br /> According to the DWR (1967) recharge to the Victor formation is by rainfall, return irrigation, and from <br /> waters of traversing streams (primarily the Mokelumne River in the Lodi area) Regional ground water <br /> flow is to the south, away from the Mokelumne River, and toward Stockton, where agricultural pumping <br /> has resulted in a significant subsidence of the ground water table (DWR, 1967) Ground water flow <br /> RPT001 915 <br />