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12 June 1998 <br /> AGE-NC Project No.98_+0'08 <br /> LPage 2 of 7 <br /> 2.3. REGIONAL GEOLOGIC SETTING <br /> According to the .Geologic ATP of California, published in 1977'by the State of California: <br /> olePar'm <br /> entof Minesand Geology,thesite area is within the Great Valley Geomorphic Province <br /> California,a large,elongate,northwest'trending structural--trough. The Great Valley Province has <br /> been filled to`its present elevation with think sequences of sediment ranging irr age from Jurassic to , <br /> Lpresent day,creating a nearly flat lying alluvial plain extending from the Tehachapi Mountains in <br /> the south to the KlamathMountains m the north: The westenz and eastern boundaries of,this <br /> province are comprised of the:California Coast Range and the Sierra Nevada,respectively.The Great <br /> Valley Province is subdivided intotwo major divisions designated the Sacramento and San Joaquin <br /> Valleys. <br /> Based on the General Soil Map from the San Joaquin County Soil Survey,published b the United <br /> y <br /> Stites Department of Agriculture, Soil Conservation;Service`in 1993, the site area is within the ; <br /> J4ckson-1=Ia11er1beck-St6ckton, (JHS) association. TIe JHS soils`are located within basins, and <br /> generally consist of moderate to poorly drainedfine textured soils.The soils aregenerally derived <br /> from both marine and-non-marine;sediment; and are generally formed in alluvium.derived from <br /> Lmixed rock sources. <br /> L2.4. GROUND WATER DEPTH ANIS FLOW-DIRECTION <br /> Based upon the map titled Lines Of Equal Depth To Groundwater-Spring 1996,prepared by the <br /> San Joaquin.County Flood--Control and Water ConservationDistrict(FCD&WCD),ground water <br /> depth at the site is appy>ximately i s feet bsg.;review'of Lines of Equal Elevation of Groundwater <br /> Spring.199a(FCD&WCD)depicts the regional groundwater flow.direction at'the site to be toward, <br /> the northeast. Review of previous ground water.monitoring results for the site and historical,depth <br /> to ground water-maps(FCD&WCD)dating back to 197.1 suggests that the depth to ground water, <br /> neat the site has fluctuated;between 1S and 30' feet bsg. 'l~Iow direction may vary locally`and . <br /> L sew <br /> onably. <br /> 3.0. _ PROCEDMS . <br /> On 06 March I998,.three soil:probe borings(P1 through P3)were advanced to depths between Z1. <br /> and 25.feet bsg'at the site. <br /> AAwxced GeoEaviroameotai,tae. <br /> L <br />