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I <br />O <br />December t b, 2002 <br />dok�tl umbw. LGOZ-213 <br />Na* 7 <br />' Table 4. <br />Boring log 9=1. <br />F0 <br />th (feet] 961 Di�lrripibm (Unified Soil Classtikadea System) <br />0 to 10 iagttt bvm% fine to mo ium �lww sand with some sDh (SM. No ground water <br />e v=tered- <br />A one (1) hour percolation test was conducted on14 2t�2 in accordurco with the <br />requirements of SJC PHS-EHD. The percolation test was composed of a pretest and the actual i <br />Dour pera>lation test..- Each test was witnessed by, Eisa %Mcdipa, Errvimmnental Health Specialist <br />of the .San Joaquin County Public Heahh Services, Environmental Health Division. Table 5 <br />pro mts a summary of the percolation test. <br />Table 5. <br />Summary of the Percolation Test. <br />In addition to the soil :suitability study, a nitrate loading balance was a rcquircment for <br />project approval by SJC FHS-EHD. <br />VU. NITRATE LOADING STl<TDY <br />A build up of nitrates in"grvund.water can cauisc a temporary blood disorder in' infwits- <br />called tnethetnoglobinerma(blue baby syndrome). Serious and occasionally. fatal poisonings of <br />infants have occurred following the ingestion of water containing nitrate concentrations greater <br />than 10 mW1 titrate as N_ or 45 mg/L nitrate as NOS. <br />Because of the concern of nitrate leaching into ground water trom the septic system, a <br />nitrate loading l alancc was required by the SJC PHS/EHD_ The purpose of a nitrate loading <br />balance is to es*atc the avrrage nitrate concentration of percolating water for the proposed <br />project ovef the long term, if a site is contributing -excess nitrogen to ground water, ground- <br />water quality could be negatively impacted. The nitrate saumcs considered for this project arse <br />from agriculture; sWic efilumt, and the deep percolation of min water_. <br />