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6. March 26,2003 <br /> Job Number: LG02-031 <br /> Page 6 <br /> r <br /> A 4-hour percolation test was started on P-1 through P-5 on October 24, 2002 in accordance with <br /> the requirements of EHD (Plate 1). The last %z hour of the percolation tests were observed by <br /> EHD. Table 3 presents a summary of the percolation tests. <br /> Table 3. <br /> Summary of San Joaquin County observed percolation tests. <br /> Test No., Percolation Percolation Rate Comment <br /> Date Tested Test Depth(ft) (minutes/inch) <br /> P-1,October 24, 3.0 12.5 min/inch Achieved satisfactory percolation rate. <br /> 2002 <br /> P-2,October 24, 3.0 6.25 min/inch Achieved satisfactory percolation rate. <br /> 2002 <br /> P-3,October 24, 3.0 6.25 min/inch Achieved satisfactory percolation rate. <br /> 2002 <br /> P-4,October 24, 3.0 8.33 min/inch Achieved satisfactory percolation rate. <br /> 2002 <br /> _ P-5,October 24, 3.0 50 min/inch Achieved satisfactory percolation rate. <br /> 11 2002 <br /> A satisfactory percolation rate was achieved at all of the locations measured. A satisfactory <br /> percolation rate is less than or equal to 60 minutes per inch(drop)per EHD requirements for a <br /> shallow percolation test. <br /> 5.0 NITRATE LOADING BALANCE <br /> A build up of nitrates in ground water can cause a temporary blood disorder in infants called <br /> methemoglobinemia(blue baby syndrome). Serious and occasionally fatal poisonings of infants <br /> have occurred following the ingestion of water containing nitrate concentrations greater than 10 <br /> mg/L nitrate as N. <br /> Because of the concern of nitrate leaching into ground water, a nitrate loading analysis was <br /> required by the EHD to estimate the average nitrate concentration of percolating water for the <br /> subject parcel. If a site is contributing excess nitrogen to ground water, ground water quality can <br /> Soo <br /> p 4 <br /> SO P <br />