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03/16/2001 11:33 20946710 AGE STOCKTON • PAGE 07 12 March 2001 AGE-NC Project No. 97-0333 Page 4 of 8 in the north. The western and eastern boundaries of this province are comprised of the California Coast Range and the Sierra Nevada,respectively. Rocks composing the basement complex of the province have not been completely defined but are believed to be metamorphic and igneous in origin. The northern and southern portions of the Great Valley Province have been designated the Sacramento and San Joaquin Valleys,respectively. Based on the General Soil Map from the San Joaquin County Soil Survey,published by the United States Department of Agriculture Soil Conservation Service in 1992,the site area is within the Delhi- Veritas-Tinnin(DVT) association.The DVT soils are located withvn dunes, alluvial fans and stream terraces along the Stanislaus River, and generally consist of well drained coarse textured soils. The soils are generally derived from both marine and non-marine sediment, and are generally formed in alluvium derived from granitic and mixed rock sources. 2.5. GROUND WATER DEPTH AND GRADIENT The estimated depth to ground water at the site is between 15 and 20 feet below surface grade(bsg) based on information from Lines of Equal Depth of Water Wells Spring 1998, published by the San Joaquin County Flood Control District and Water Conservation District(SJCFCD).Based on review of a regional ground water elevation map published by the SJCFCD, the prevailing ground water flow direction in Manteca is generally toward the north,although flow directions may be both locally and seasonably variable. Depth to ground water was measured at approximately 17 feet bsg during a 11 December 2000 ground water monitoring event at the site; ground water flow direction was inferred towards the northeast at a gradient of 0.001. 3.0. SCOPE OF WORK AGE proposes to drill and install one six-inch diameter ground water extraction well (EW-1) screened between 15 feet and 35 feet bsg and one two-inch diameter ground water observation well (MW-6) screened between 15 and 35 feet bsg.Following installation of the wells,a 12-hour aquifer pump test will be conducted at the site to predict a general radius of influence during ground water extraction activities. The newly installed extraction well will be utilized as the extraction point during the 12-hour aquifer pump test; the newly installed observation well and existing monitoring wells MW-1,MW-2 and MW-3 will be utilized as observation points during the 12-hour pump test. The scope of work will consist of the following tasks: Advanced GeoEnvironmenlal.Inc.