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FJKooyman Property <br /> Our Project Number: E07197B Page 4 of 10 <br /> November 26, 2007 <br /> F <br /> 4.0 GROUND WATER INFORMATION <br /> FJ4.1 Ground Water Depth and Gradient <br /> The San Joaquin County Flood Control and Water Conservation District (1998, 1999, 2003 and <br /> 0 2004) ground water depth and elevation maps were reviewed to determine the ground water <br /> I levels near the site. The fall 2003 and spring 2004 maps are the most current official maps <br /> available from the County. According to these maps (Plates 5-6), ground water lies between 0 <br /> I and 10 feet below ground surface and flows at a gradient of about 2.14 feet per mile to the <br /> southwest in the vicinity of the site. This is contradicted by both the fall 1998 and spring 1999 <br /> t maps (Plates 3-4) which suggest that groundwater lies between 10 and 20 feet below ground <br /> surface. Both drillers' notes (20 feet below ground surface) from previous well installations in <br /> the area and our shallow groundwater boring performed on November 26, 2007 (>8.5 feet <br /> below ground surface) agree with the 1998 and 1999 maps. <br /> rl <br /> No ground water was encountered by the staff of Neil 0. Anderson & Associates, Inc. during <br /> the drilling to a depth of 8.5 feet on November 26, 2007. <br /> 4.2 Potential Ground Water Contamination Issues <br /> Identifying potential ground-water contamination sources was not part of the scope of work for <br /> the soil suitability study. However, our firm did conduct a Surface Sub-Surface Contamination <br /> Report (SSCR) for the subject property, which does address these issues (NOA, 2007). <br /> Potential ground-water contamination can occur from a number of sources which often include <br /> leaky underground storage tanks, agricultural activities, dairies, septic systems, and storm <br /> water infiltration. Agricultural activities and the use of septic systems in the area should be <br /> considered potential ground-water contamination sources. <br /> 4.3 Water Sample Location <br /> R$ There are two existing wells on site. One is an agricultural well, while the other is a domestic <br /> well. There was only one well permit found during file review at EHD on November 27, 2007. <br /> One water sample was taken on November 29, 2007 from the domestic well located next to the <br /> existing residential dwelling, by a representative from our office <br /> F! 4.4 Water Sample Constituents <br /> FIThe water sample was analyzed for nitrate and DBCP. Lab results for the sample were not <br /> ready at the time of this report. These results will be presented in a separate letter to the client <br /> and county pending completion. <br /> The presence of nitrates is not uncommon in shallow ground water aquifers in San Joaquin <br /> County and other parts of the Central Valley. Nitrate in ground water occurs as a result of the <br /> application of fertilizers, livestock waste, and untreated septic tank waste. Nitrate is mobile and <br /> often accumulates in the shallow ground water zones. <br /> F1 <br /> Fi902 Industrial Way•Lodi,CA 95240•209.367.3701 •Fax 209.369.4228 ©2007 Ned 0.Anderson&Associates,Inc v <br />