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Mr. Sandi De Jong <br /> September 25,2003 <br /> Page 11 <br /> 6.6 Required Size of Septic System <br /> According to the San Joaquin County Sewage Standards, the size of a conventional septic field <br /> would follow these calculations: <br /> Base Tank Capacity(BTC): 1200 gallons (required by County) <br /> Average Daily Flow(ADF): 732 gallons <br /> Soil Factor(SF): 0.250 for hard pan/clayey areas <br /> Leach Line (LL) Length(ft)=(BTC+ADF) * SF <br /> One 60-in diameter, 25-ft deep seepage pit is equivalent to 110 feet of leach line. <br /> LL=(1200 gal+ 732 gal) * 0.25 <br /> LL=483 feet (total leach line required with out pits) <br /> POSSIBLE CONFIGURATION <br /> By using seepage pits, the size of the leach field can be reduced. One configuration is using three <br /> (3), 100-ft long leach lines with one 36-inch diameter by 25 foot deep seepage pit attached to <br /> each leach line. <br /> LL—three(3), 100-ft leach lines with one seepage pit attached to each line, 300 ft total. <br /> Pits—three(3), 36-in diameter pits equivalent to 220 ft of leach line. <br /> This example contains 520 feet of equivalent leach line which would be satisfactory. Though <br /> 2,000 gallons is the minimum septic tank capacity required by Environmental Health, we would <br /> recommend utilizing two (2_ ) 2,000 gallon tanks to promote clean effluent and additional <br /> denitrification treatment. <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 <br /> ,Public Health Services, Environmental <br /> Health Division, (PHS-EHD) for the e pop so e'd�"cgiurce facility to measure the potential <br /> concentration of percolating effluent and rain fall overt the long term. If the proposed project will <br /> ti dispose of septic effluent to a shallow leach field, ground water quality may be impacted to some <br /> degree. <br /> pE RS 1 <br /> Z '• <br />