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-.oe <br /> September 3,2003 <br /> Job Number:LG03-226 <br /> Page 3 <br /> 5.0 GROUND WATER <br /> The San Joaquin County Flood Control and Water Conservation District' ground-water depth <br /> and elevation maps for Fall 1998 and for Spring 1999 indicates the most recent ground-water <br /> levels for San Joaquin County. These maps were used to determine the general depth and flow <br /> direction of regional ground water(Plates 2 through 5). Table 2 summarizes all the available <br /> ground-water information collected for the site and nearby area. <br /> Table 2. <br /> Summary of Available Ground Water Information. <br /> Date,Description,Source Groundwater Depth Notes <br /> Fall 1998, San Joaquin County Ground Greater than 100 feet in depth. Gradient is NNE at <br /> Water Map,Plates 2 and 4 6.9 ft/mile. <br /> Spring 1999,San Joaquin County Ground Between 80 and 90 feet in depth. Gradient is E at 7.3 ft/mile. <br /> Water Map,Plates 3 and 5 <br /> DZ IJ There are no wells on the subject property; therefore,no water quality samples were taken. <br /> L 6.0 GEOLOGY, SOILS,AND PERCOLATION TEST <br /> The surficial geology of the site is comprised of the Modesto Formation. The unit comprising <br /> the Pliestocene alluvium consists of distinct alluvial terraces and some alluvial fans and <br /> abandoned channel ridges. It consists of tan and light-grey gravelly sand, silt, and clay. The <br /> (�"1 Modesto was deposited by streams still existing today because the deposits, for the most part, <br /> Cly\ border existing streams. <br /> The surface and near surface soils located on the site are reported to be Boggiano clay loam and <br /> Finrod clay loam(Plate 7).2 Table 3 presents an excerpt of some selected engineering properties <br /> ' San Joaquin County Flood Control and Water Conservation District, 1999, Depth to ground-water map <br /> and ground-water elevation map for Spring and Fall 1998. Published bi-annually,scale: 1 inch=2 miles. <br /> 2 USDA Soil Conservation Service, 1992,Soil Survey of San Joaquin County,California, Sheet 7. <br /> pf Rt 1 <br /> r <br /> f <br /> �'TSpC� <br /> fa <br />