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—� December 16,2002 <br /> Job-Number:LG02-21.3 <br /> Pagc 7 <br /> - F Table 4. <br /> Boring log W.T. <br /> Depth (feet) Soil Description(Unified Soil Classification System) <br /> . 0 to 10 Light brown fine.to medium loose sand with some silt. (SP). No ground water <br /> encountered. <br /> A one (1)hour percolation test was conducted on 4 2002 in'accordiince with the <br /> re uirements'of SJC PHS-EHD. The percolation was com osed of a retest and the actual l <br /> q P P P <br /> hour percolation test.-. Each test was,witnessed by Lisa Medina, Environinental Health Specialist. . <br /> of the.San Joaquin County Public Health.Services, Environmental Health Division. Table 5 , <br /> resents a summary of the percolation test. <br /> presents �'Y P <br /> ti <br /> Table 5— <br /> Summary <br /> Summary of the Percolation Test. <br /> No. Percolation Test Depth(ff) Percolation Rate <br /> (minutes/inch) <br /> P_1 3 <i.67 min/inch <br /> In addition to the soil.'suitability study; a nitrate loading-balance was a requirement for <br /> project approval by SJC PHS-EHD. . <br /> VII. NITRATE LOADING STUDY <br /> A build up of nitrates in ground,water can cause a temporary"blood disorder in'infants- <br />' called methemoglobinemia(blue baby syndrome). Serious and occasionallyfatal poisonings of <br /> f infants have occurred following the ingestion of water containing nitrate concentrations greater. <br /> than 10 mg/L nitrate as'N or 45 nig/L nitrate as NO3. <br /> ' Because of the concern of nitrate leaching into ground water frorn the septic ssten, a <br /> _ <br /> nitrate loading balance was required by the SJC PHS/EHD. The purpose of a nitrate•loading . <br />[ s` balance is to estimate the'average nitrate concentration of percolating water.for the proposed <br /> . project over the long term. If a site is contributing excess nitrogen to ground water, ground- <br /> water quality could be negatively impacted. The nitrate sources considered for this project are <br /> from agriculture, septic effluent, and the deep percolation of rain water.. <br /> r <br />