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December 16,2002 <br /> Job Number: LG02-213 <br /> -Page 4' <br /> period of 12 hours prior to collection of the sample. The analysis indicated that nitrate was. <br /> found at 77 mg/L-NO3 for the June 28, 2002 sample. This level is approximately 1.7 times <br /> �. higher than the drinking water limit for nitrate. <br /> The occupants of the residence on site were verbally notified regarding the high•nitrate. <br /> level measured in the well water b Rollin Hall of our office. We.understand that the occupants <br /> , Y p , <br /> had been using bottled water for consumption.' Table'2 provides a summary of the ground water.. <br /> 1 � information available for the site. <br /> ., <br /> Table 2. <br /> Summary of Available Ground Water Information: <br /> Date,,Description,Source Groundwater Depth Notes <br /> June 13 2002 o e 10-foot exploratory soil Greater than 10 feet in depth. No ground water found to a . <br /> baring,Neil 0.Anderson&Associates, total depth of 10 feet. <br /> Inc. <br /> June 7,2002, first ground-water sample Ground-water depth not measured Nitrate, 120 mglL-NO; <br /> obtained from the existing domestic well. in well. DSCP:Not Detected <br /> June 28'2002i second ground-water sample Ground-water depth not measured Nitrate: 77 mg/L-NO3 <br /> obtained from the existing domestic well. in well" <br /> Neil O.Anderson&Assoc.,Inc., <br /> Fall 1998-,San Joaquin County Ground About 23 feet in depth. Gradient about 5.3 it/mi,. <br /> Water Map. See Plates 2&4, flowing north. <br /> Spring-1999, San Joaquin County Ground About_23 feet in depth. Gradient about 5.0 ft/mi, <br /> r Water Map. See Plate 3 & 5. flowing northwest. <br /> E <br /> - The presence of nitrates and OBCP. are not uncommon in shallow ground-water aquifers <br /> in San Joaquin County and other parts of.the Central Valley. Nitrate in ground water occurs as a <br /> result 4F)f the application of fertilizers,livestock waste, and untreated septic tank waste. Nitrate is <br /> mobile; and often accumulates in the shallow ground-water zones. <br /> In the early 1900's, natural levels of hit-rate in ground water were.measured in forty-three <br /> (43) wells throughout-the Sacramento Valley by Bryan.' It was thought that ground water at that.. <br /> Z Bryan,K., 1923,Geology and ground-water resources of Sacramento Valley of California:U.S. <br /> 'Geological Survey Water-Supply Paper 4.95,285p. . <br /> s - <br /> Z W <br /> r <br /> i <br />