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' 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 ofAgnculture Soil Conservation Service in 1992,the site areais within the Delhi- <br /> Veritas-Tinnin(DVT)association The DVT soils are located within dunes,alluvial fans and stream <br /> ' terraces along the Stan islaus 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 /> 1 <br /> 2 5 GROUND WATER DEPTH AND GRADIENT <br /> Regionally,the estimated depth to ground water at the site is between 15 and 20 feet below surface <br /> grade(bsg)based on information from Lanes of Equal Depth of Water Wells Spring 1999, published <br /> ' by the San Joaquin County Flood Control District and Water Conservation District(SJCFCD) Based <br /> on review of a regional groundwater elevation map published by the SJCFCD,the prevailing ground <br /> water flow direction in Manteca is generally toward the north-northeast, although flow directions <br /> may be both locally and seasonably variable <br /> Locally since July 2000,depth to ground water measurements have vaned in monitoring wells at the <br /> site between 15 feet and 22 feet bsg Ground water flow direction was consistently inferred towards <br /> the north-northeast at a gradient of 0 001 ft/ft,however,since initiation of the interim ground water <br /> ' pump-and-treat system in January 2002, ground water flow direction at the site has been inferred <br /> radially inward towards wells MW-1, EW-1 and MW-6 at an approximate gradient of 0 01 ft/ft <br /> 1 <br /> 1 I <br /> 1 Advanced GeoEnvironmeutal,Ioc. � <br /> I <br /> i <br /> t <br />