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September 30,2007 <br /> 6` NOA Project Number: E07147A <br /> 4.0 GROUND WATER INFORMATION <br /> L <br /> V4.1 Ground Water Depth and Gradient <br /> b— The San Joaquin County Flood Control and Water Conservation District (1998 and 1999) ground <br /> water depth and elevation maps were reviewed to determine the ground water levels near the site. <br /> The Fall 1998 and Spring 1999 maps are the most current official maps available from the County. <br /> According to these maps (Plates 3-6),ground water lies between 50 and 60 feet below ground <br /> surface and flows to the northeast in the vicinity of the site. No ground water was encountered by <br /> the staff of Neil O.Anderson&Associates, Inc. during the drilling of a percolation test boring to a <br /> 6. depth of twenty-five feet on September 13,2007. <br /> �4.2 Potential Ground Water Contamination Issues <br /> dendifying potential ground-water contamination sources was not part of the scope of work for the <br /> soil suitability study. Potential ground-water contamination can occur from a number of sources <br /> L, which often include leaky underground storage tanks, agricultural activities, dairies, septic systems, <br /> and storm water infiltration. Agricultural activities and the use of septic systems in the area should <br /> be considered potential ground-water contamination sources. <br /> lj 4.3 Water Sample <br /> o e permits were found during file review at EHD on September 14. 2007.A well water sample <br /> was taken by FGL Environmental in Stockton, California./ <br /> L <br /> v 5.0 SOIL PROFILE AND GEOLOGIC INFORMATION <br /> The site is depicted on the USGS Preliminary Geologic Map of the Lodi and Galt Quadrangle as <br /> within the Quaternary Riverbank Formation. Quaternary Riverbank Formation (upper,lower and <br /> middle members) these units are arkosic alluvium forming Mokelumne River terraces and alluvial <br /> `, fan; chiefly sand;probably glacial outwash lower fans;abundant volcanic detritus (Plate 7). <br /> The surface and near surface soils located at the site are reported by the San Joaquin County Soil Survey <br /> `, to be composed of Kingdon fine sandy loam,Tokay fine sandy loam and Tujunga loam, sand, all <br /> 0-2% slopes (Plate 8) (USDA, 1992). Table 2 presents some selected properties of these soils: <br /> 6. <br /> i <br /> L <br /> 4 <br /> 6- '-A4 <br /> L <br />