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December 23,2002 <br /> Job Number.LG02492 <br /> Page 6 <br /> inch. The test was stopped and the inspection appointment with Environmental Health was <br /> canceled. <br /> 6. <br /> A new percolation test location(P-2)was selected and drilled(Plate 1). On December 17, 2002 <br /> a 4-hour percolation test was performed at location P-2 in accordance wit ieregmrements of <br /> 6. San Joaquin County Environmental Health Division(Plate 1). The last'/2 hour of the percolation <br /> test were observed by Johnny Yoakum, Environmental Health Specialist of the San Joaquin <br /> County Environmental Health Department. Table 3 presents a summary of the percolation tests. <br /> Table 3. <br /> Summary of San Joaquin County observed percolation test. <br /> Test No., Percolation Percolation Rate Comment <br /> Date Tested Test Depth(ft) (minutes/inch) <br /> 6. P-1,December 13, 3.0 250 min/inch Achieved an unsatisfactory percolation rate <br /> 2002 during the first V2 of the test. Satisfactory <br /> percolation rate for shallow test is<60 min/in. <br /> P-2,December 17, 3.0 11.9 min/inch Achieved satisfactory percolation rate. <br /> 2002 <br /> V <br /> A satisfactory percolation rate of 11.9 minutes per inch was measured at the P-2 location. A <br /> satisfactory percolation rate is less than or equal to 60 minutes per inch(drop)per County <br /> requirements. In addition to the Soil Suitability Study, a nitrate loading balance was performed. <br /> 6- 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/I nitrate as N or 45 mg/1 nitrate as NO3. <br /> Because of the concern of nitrate leaching into ground water, a nitrate loading analysis was <br /> required by the County 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 /> be impacted. The nitrate sources considered for this project are percolating septic effluent from <br /> pE[SO <br /> i <br /> t` <br /> 4 <br /> �SSOC\ <br /> V <br />