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bw <br /> Mr.Steven Malcoun <br /> December 9,2003 <br /> 6. Page 10 <br /> A summary of the percolation tests is presented in Table 5. <br /> Table 5. <br /> Summary of Percolation Tests. <br /> Test No., Percolation Percolation Rate Test Comment <br /> Date Tested Test Depth(ft) (minutes/inch) Duration (see notes) <br /> P-1 shallow,9-10-03 33 3.4 4 hr Satisfactory percolation rate <br /> P-1 deep,9-10-03 23.1 5.2 4 hr Satisfactory percolation rate <br /> r <br /> P-2 shallow,9-10-03 3.1 25 4 hr Satisfactory percolation rate <br /> Ir P-2 deep,9-10-03 21.7 36 4 hr Unsatisfactory percolation rate <br /> Notes: A satisfactory percolation rate for a"shallow"test is less than or equal to 60 minutes per inch. <br /> A satisfactory percolation rate for a"deep"test is less than or equal to 30 minutes per inch. <br /> .. 6.5 Discussion of Percolation Tests <br /> The shallow soil strata, composed dark brown silty sand, demonstrated a satisfactory percolation <br /> rate in accordance with the requirements of the San Joaquin County EDH. The soils of the site <br /> appear to be suitable for a septic system utilizing shallow leach lines and seepage pits. <br /> 6.6 Required Size of Septic System <br /> The construction specifications of the septic system should follow the San Joaquin County <br /> Sewage Standards guidelines. <br /> 7.0 NITRATE LOADING ANALYSIS <br /> Because of the concern of nitrate leaching into ground water from septic systems, a nitrate <br /> ` loading analysis was required by the San Joaquin County Public Health Services,Environmental <br /> Health Division(PHS-EHD), for the proposed facility to measure the potential concentration of <br /> percolating effluent and rain fall over the long term. If the proposed project will dispose of septic <br /> effluent to a shallow leach field, ground water quality may be impacted to some degree. <br /> The method utilized for the nitrate loading analysis is based on a simple mass balance formula, <br /> ., discussed in a published article by Hantzsche and Finnemore(1992)which provides a convenient <br /> and simplified method to estimate long-term ground-water nitrate impacts on an area-wide basis. <br /> '` <br /> jpFRiO <br /> 1 <br /> Q'j "ZI <br />