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10 August 1999 <br /> AGE-NC Protect No 97-0333 <br /> Page 3 of 9 <br /> Coast Range and the Sierra Nevada, respectively Rocks composing the basement complex of the <br /> ' province have not been completely defined but are believed to be metamorphic and igneous in <br /> origin The northern and southern portions of the Great Valley Province have been designated the <br /> Sacramento and San Joaquin Valleys, respectively <br /> Based on the General Soil Map from the San Joaquin County Soil Survey, published by the United <br /> ' States Department of Agriculture Soil Conservation Service in 1992,the site area is within the Delhi- <br /> Ventas-Tuulin(DVT)association The DVT soils are located within dunes, alluvial fans and stream <br /> terraces along the Staiuslaus River, and generally consist of well drained coarse textured soils The <br /> ' soils are generally derived from both marine and non-manne sediment, and are generally formed in <br /> alluvium derived from granitic and mixed rock sources <br /> ' <br /> 25 GROUND WATER DEPTH AND GRADIENT <br /> The estimated depth to ground water at the site is approximately 20 feet below surface grade (bsg) <br /> based on information from Lines of Equal Depth of Water Wells Spring 1997, published by the San <br /> Joaquin County Flood Control District and Water Conservation District(SJCFCD) Based on review <br /> of a regional ground water elevation map published by the SJCFCD, the prevailing ground water <br /> flow direction in Manteca is generally toward the northw est, although flow directions may be both <br /> ' locally and seasonably variable <br /> Based on data collected during the April 1999 investigation, depth to ground water was measured <br /> 1 at approximately 15 feet bsg in probe borings P-1 through P-5 <br /> ' 3.0. SCOPE OF WORK <br /> ' The results of the preliminary investigation and UST removal activities indicate that ground water <br /> and soil at the site has been impacted by petroleum hydrocarbons Subsurface conditions must be <br /> studied to evaluate feasibility and cost effectit eness of potential remedial alternatives for <br /> 1 hydrocarbon-impacted soil and ground Aater at the site The feasibility study will consist of the <br /> folloNAing tasks <br /> ' • Permitting and pre-field v ork activities <br /> • Drilling <br /> i Well installation and deA clopmcnt, <br /> Pilot studies <br /> adianted(;eaFn%3ronmentai, ir, <br />