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October 7, 1999 <br /> Job Number: S99226 <br /> Page 4 <br /> Summary of Ground-Water Information for the Site <br /> Date of Measurement,Source Ground-water Depth Comments <br /> Fall 1997, San Joaquin County Ground Between 55 and 60 feet <br /> Water Depth Map,Plate 2 <br /> Spring 1988,San Joaquin County Between 45 and 50 feet <br /> Ground Water Depth Map,Plate 3 <br /> Fall 1997, San Joaquin County Ground 10 foot seasonal change 97/98,gradient 2- <br /> Water Elevation Map, Plate 4 3 feet per mile,flow direction east. <br /> Spring 1988, San Joaquin County 10 foot seasonal change 97/98, gradient <br /> Ground Water Elevation Map,Plate 5 uncertain,flow direction southeast. <br /> September 9, 1999 No ground water Total dept of exploration was 30 feet <br /> Neil O. Anderson&Associates,Inc. encountered to 30 feet <br /> Geotechnical Report dated September in depth. <br /> 17, 1999 <br /> 1764 E. Mettler Road Unknown Water quality test Nitrate 6 as NO, <br /> eater sam le from home owner Water test DBCP- .77 u <br /> Note: Elevation of the site is approximately 28-30 feet above Mean Sea Level(MSL).N.D.=noltUtocwd <br /> A water sample was obtained from a nearby well located at 1764 E. Mettler, north of the <br /> subject site, on September 10, 1999. The sample was submitted to the FGL Environmental <br /> Laboratory and tested for the presence of dibromochloropropane (DBCP) and Nitrate(NO,) per <br /> County requirements. The test results indicated that DBCP was found at 0.77ug/l and nitrate as <br /> NO, found at 64 mg/l. Both tests exceed the maximum contaminate level set by the United States <br /> Environmental Protection Agency of 0.2 ug/1 for DBCP and 45 mg/1-NO,for nitrate. <br /> lftsetm <br /> The presents of nitrates and DBCP are not uncommon in shallow ground water aquifers in <br /> San Joaquin County and other parts of the Central Valley. Nitrate sources in ground water occur <br /> from agricultural fertilizers, livestock waste, and untreated septic tank waste. Nitrate is mobile <br /> and often accumulates in the shallow ground water zones. DBCP is a nematocide and soil <br /> fumigant for vegetables, and grapes. The use of DBCP was discontinued in 1979. <br /> A thirty (30) foot deep ground water boring was drilled in the southwest corner of the <br /> property near percolation test P-5 to determine the presence of shallow ground water. The boring <br /> pall S7I <br />