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F1April 20, 2004' -- - <br /> NOA Project Number: E04002A <br /> -Page 10 <br /> Table 5. <br /> = <br /> Summary of Percolation"Tests. " <br /> Test No., Percolation -Percolation Rate TestComment <br /> Date Tested- -- Test Depth(ft) (minutes/inch) Duration - (see notes) _ <br /> PT 3.11'shallow,4-20-04 3.11 --- 4 hr _ Not evaluated _ <br /> - <br /> PT 8.70'deep,4-20-04 8.70 - --- 4 hr Not evaluated <br /> PT"3.20'shallow,4-20-04 320 No movement 4 fir Failed <br /> PT 24.00'dee ,4-20-04 -:.24.00 __-__ _ 8.06 4 hr Satisfactoa 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 soils within the sewage disposal area have demonstrated a satisfactory percolation rate in -- <br /> accordance with the requirements of the San Joaquin County EHD. The soils of the Site appear <br /> to be suitable I&"a septic system. utilizing shallow leach lines arid-seepage pits. <br /> 1/ 6.6 Required Size of Septic System <br /> The EHD"Sewage Standards_should.be followed-to size the septic system. - <br /> 7.0, -NITRATE LOADING ANALYSIS <br /> ri <br /> Because of the concern of nitrate leaching into ground water from septic stems a nitrate <br /> �" p systems, _ <br /> loading analysis was required by the'San Joaquin County Public Health.Services, Environmental.. <br /> F1Health Division (PHS-EHD) for the proposed facility to measure the potential concentration of <br /> percolating-effluent and rain fall over,the.long term. Where percolating effluent leaches into the <br /> ground, groundwater quality.may"be-impacted:to some degree should the effluent reach ground <br /> FJwater. _ <br /> The method_utilized for the nitrate loading analysis is based on.a simple mass balance formula, <br /> F1 discussed in a published article by Hantzsche and Finnemore (1992) which provides a convenient <br /> and simplified method°to:estitxiate long-term:ground-water nitrate impacts on an area-wide basis. <br /> F1Hantzsche and Finnemore"found that over a long period of time, water quality in the upper. ' <br /> saturated ground-water zone closely approximates the quality of percolating recharge waters. <br /> Fj <br /> They believe that their method"is a good planning tool and provides useful information to <br /> planners and local officials tint with some real"limitations. -In their article published in Ground <br /> Water, Hantzsche and-Fiiinemore mention that-":Ahe equation ignores dispersion, lateral flow, <br />