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June 10,2002 <br /> Job Number:LG02-164 <br /> Page 4 <br /> V. GROUND WATER <br /> The San Joaquin County Flood Control and Water Conservation District ground-water <br /> depth and elevation maps indicate the ground-water levels of most parts of the San Joaquin <br /> County.' The Fall 1998 and Spring 1999 ground water maps are the most recent maps depicting <br /> the ground-water depth and elevation for San Joaquin County. The ground-water gradient and <br /> ground-water flow direction near the site is between 2.9 and 3.5 feet/mile flowing westward for <br /> the period of Fall 1998 to Spring 1999. According to these maps, the depth to ground water for <br /> this period was between 12 and 13 feet. <br /> The following table summarizes all the available ground water information collected for <br /> the site and nearby area. <br /> Table 3. <br /> Summary of Available Ground Water Information. <br /> Date,Source Groundwater Depth Dotes <br /> May 23,2002,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. 5.6 mg/L-NO3(or 1.2 mg/L-N) <br /> Water quality test for DBCP-ND. <br /> Fall 1998,San Joaquin County Flood About 13 feet. About 2.9 feet/mile flowing toward <br /> Control and Water Conservation District the west. <br /> map.t <br /> Spring 1999, San Joaquin County Flood About 12 feet. About 3.5 feet/mile flowing toward <br /> Control and Water Conservation District. the west. <br /> Note:ND=Non-Detectable(or not found at detectable limits). <br /> A ground-water sample was obtained from the onsite water well on May 22, 2002. The <br /> samples were sent to Precision Environmental Laboratory, Stockton, for testing on the same day. <br /> The samples were tested for the presence of dibromochloropropane(DBCP) and Nitrate/(NOD <br /> per County requirements. _!Z�.nll /y ,%soO .A"aJ/ o74 A/ri/ Xnc+�rsor <br /> ' San Joaquin County Flood Control and Water Conservation District. Depth to ground water and ground- <br /> water elevation maps Fall 1998 and Spring 1999. Published biannually,Scale: 1 inch=2 miles. <br /> ?�ERSD <br /> r 1 <br /> D n <br /> 'L W <br /> O � <br /> 1 r <br /> sSe�\ <br />