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July 21,2003 <br /> Job Number:LG03-120 <br /> Page 4 <br /> flow direction near the site is between 7.1 and 8.3 feet/mile flowing north to northeast for the <br /> period of Fall 1998 to Spring 1999. According to these maps,the depth to ground water for this <br /> period was between 34 and 35 feet. <br /> The following table summarizes all the available ground water information collected for the site <br /> and nearby area. <br /> Table 3. <br /> Summary of Available Ground Water Information. <br /> Date,Source Groundwater Depth Notes <br /> June 12,2003,one(1)3-ft deep soil boring, No ground water <br /> Neil O.Anderson&Associates,Inc. encountered. <br /> Water sample from the on-site domestic Unknown. Water quality test for nitrate: <br /> water well. Depth unknown. 1!0 (, 94 mg/L-NO3(or 20.9 mg/L-N) <br /> Fall 1998,San Joaquin County Flood About 35 feet. About 8.3 feet/mile flowing <br /> Control and Water Conservation District northeast. <br /> 1 <br /> map. <br /> Spring 1999, San Joaquin County Flood About 34 feet. About 7.1 feet/mile flowing <br /> Control and Water Conservation District.l northward. <br /> Note:ND=Non-Detectable(or not found at detectable limits). <br /> A ground-water sample obtained from well W-1,was sampled on June 12, 2003 at 2:00 pm to <br /> _ test for the concentration of nitrate (Plate 1). The sample was collected from the closest water <br /> facet to the well by Hilary Oliveria of our office using a plastic laboratory sampling container <br /> provided by the Laboratory. The sample was kept in refrigerator storage overnight at our office. <br /> _ The sample was taken to Precision Environmental Laboratory, Stockton, for testing on June 13, <br /> 2003. The sample was tested for the presence of Nitrate(NO3). <br /> *The test results indicated that nitrate was found at 94 mg/1-NO3 (or 20.9 mg/L-N). The result <br /> of the nitrate test indicates the ground water is well above the maximum contaminate level set by <br /> the United States Environmental Protection Agency of 45 mg/L as NO3 (or 10 mg/L-N). <br /> y 2 The presence of nitrates is not uncommon in shallow ground-water aquifers in San Joaquin <br /> County and other parts of the Central ValYater <br /> itrate in ground water occurs as a result of the <br /> application of fertilizers, livestock waste, treated septic tank wasfe.Nitrate is mobile and <br /> often accumulates in the shallow ground- ones. / / /,� <br /> SSa/V e /h s n 9�/d-e,"l�+ n '�'n is. <br /> W 4y n A rn Y11�'on �• <br /> Y 'pERt 1 <br /> Z � <br /> f <br />