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10 August 1999 <br /> AGE-NC Project 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 VaIIey Province have been designated the <br /> Sacramento and Sart Joaquin Valleys,respectively <br /> Based on the General Soil Map from the San Joaquin County Soil Survey,published by the United <br /> States Departr cent of Agriculture Soil Conservation Service in 1992,the site area is vsnthm the Deau- <br /> Veritas-Tmnin(DVT)association.The DVT soils are located within dunes,alluvial fans and stream <br /> terraces along the Stamslaus River, and generally consist of well drained coarse textured soils The <br /> soils are generally derived from both marine and non-mann sediment, and are generally formed in <br /> alluvium derived from granitic and mixed rock sources <br /> Z 5 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.ernes 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 SJCI;CD, the prevailing ground water <br /> flow direction in Manteca is generally toward the northwest, although flow directions mqy be bort; <br /> locaily and seasonably variable <br /> Based on data collected during the April 1999 investigation, depth to ground Aater was measured <br /> 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 effectiveness of potential remedial alternatives for <br /> hydrocarbon-impacted soil and ground water at the site The feasibility study will consist of the <br /> following tasks <br /> Permitting and pre-field Nork activities- <br /> Dialling, <br /> Well installation and development, <br /> Pilot studies <br /> • 4dvanced GmEnvironmental Inc <br /> 1 <br />