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July 24,2003 <br /> Job Number:'LG03-206 s <br /> Page 6 <br /> accordance with the regw'rements'of the EHD. The water drop was measured,every.30minutes <br /> fora period of four hours for the shallow test.The water drop was measured every 10 minutes for <br /> a period of one hour for the deep test. A thirty minute pretest was performed on each percolation <br /> test to determine weather a one hour test was warranted according,the percolation test standards <br /> for EHD. The last measurement of each test was observed by Justin Hess, Environmental Health <br /> _ Inspector, of the EHD. <br /> The shallow percolation test failed to achieve a satisfactory percolation rate of 60 thin/in or less. . <br /> The deep percolation test.achieved a satisfactory percolation rate of<1.7 min/in, A ercolation. <br /> P <br /> rate.of 30 min/in or less is.a satisfactory for a deep test. A summary of the.percolation test`is <br /> presented on Table 4. <br /> Table 4. <br /> Summary of percolation,test. <br /> Test No., Percolation Percolation Rate Comment <br /> . ' Date Tested Test Depth(ft) (minutes/inch) <br /> Shallow Test,6-25-03 3.0 . no movement" ' Unsatisfactory percolation rate. <br /> Dee Test,6-25703.. 12.7 <13 �/.C Achieved satisfactoryercolation rate. <br /> As a result of the percolation testing, the existing septic.system disposal area demonstrated a <br /> satisfactory percolation rate in accordance with the requirements of the San Joaquin County.. <br /> .EDH. = <br /> In addition to the soil suitability study., a nitrate loading study was performed for the project: The <br /> nitrate loading study provides an-estimate of.the potential impact from,nitrate to the ground <br /> water. <br /> r 6.0NITRATE LOADING STUDY <br /> 6:1 Hantzsche and Finriemore's Approach to Estimating Nitrate'Impacts to Ground . <br /> Water <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 EHD to measure the-potential <br /> concentration of percolating effluent and rain fall over the long terra. If the percolating effluent <br /> and rain water reach the aquifer, ground water quality may be.impacted to some degree. <br />