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F <br /> nitrogen concentration of wastewater in mg NIL <br /> on(%)of nitrate-nitrogen loss due to denitrification in the soil <br /> age recharge rate of rainfall - inches per yr <br /> ground nitrate-nitrogen concentration of rainfall recharge, exclusive of wastewaterences (ppm NO3-N) <br /> Values and Assumptions <br /> 1.) The total number of people to visit the facility daily has been derived from the Demographics <br /> Chart on Page 3. <br /> 2.) The decrease in nitrate concentration in the water table between the upgradient and <br /> downgradient test pits, in relation to the assumed groundwater flow under the filter beds <br /> is 42%. It is unknown if this is attributable to denitrification. However, a denitrification <br /> percentage of 35%will be applied in the following equation: <br /> 1=340 people x 15 gals/person/d x365 d/vr= 1,861,500 gals=total W W/vr=248,864 cu fr= 1.24 in/yr <br /> 2.27+52.84 Ac x 43,560 sq ft/Ac x (1 ft/12 in) <br /> Nw= 103 mg N/L <br /> d = Assume 35% due to direct observation and the indigenous clay soils <br /> R = 11 in/yr. <br /> Nb= Assumed to be 0.1 ppm NO3-N <br /> 1.24 in/yr(103mg N/L) (1 - 0.35) + (11 in/yr x 0.1 mg/L) <br /> Nr = (1.24 in/yr+ 11 in/yr) <br /> Nr = 6.9m asnitrate-nitrogen(N0,-N) or30.6 ppmas nitrate (NO3) <br /> H. EXISTING SEPTIC SYSTEM COMPONENTS <br /> The possibility of future design or operational changes to the existing septic system, and design <br /> requirements for the proposed Truck Stop will be based upon the factors of operation, longevity, <br /> and environmental protection. The San Joaquin County Environmental Health Department will <br /> stipulate design requirements for compliance with these factors. Septic system designs approved <br /> by EHD have included package treatment plants, denitrifying septic tanks, dual septic tank <br /> systems, recirculating sand filters, mound systems, innovative filter beds and shallow leachfields. <br /> 9 <br /> Chemey Consulting <br />