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7= Background of nitrate-nitrogen loss due to denitrification in the soil harge rate of rainfall - inches per yr NLS§3.2 nitrate-nitrogen concentration of rainfall recharge, exclusive of wastewater influencesN) Values and Assumptions I= 1,700 god x 365 d/yr=620,500 gals=total W W/yr=82,955 cu ft = 1.38 in. 16.51 Ac x 43,560 sq ft/Ac x(1 ft/12 in.) Nw = mg N/L=60.1 TKN: d = Assume 25%due to the clay nature of the native soil and therefore medium-high denitrification potential R = 9.25 in/yr. Nb= Assumed to be 0.1 ppm NO3-N 1.38 in/yr(60.1 mgN/L) 0 - .25)+(9.25 in/yr x 0.1 m /g_L) Nr = (1.38 in/yr+9.25 in/yr) 2= �.O ppm a nitrate-nitrogen(NO3-N)or 26.8 ppm as nitrate(NO3) The maximum calculated nitrate loading concentration in the recharge effluent from the Southwinds Church is determined to be a little more than half(six-tenths) of the Maximum Contaminant Level (MCL) limit for nitrate in drinking water. MOUND SYSTEM DESIGN CRITERIA SSS§3.7. a design of the pressurized mound disposal system for this project is based upon criteria r efficient operation, disposal field longevity, and environmental protection. An overview e system operation is as follows: Influent waste from the new Worship Center Building will gravity through a four-inch tightline into a new,two compartment 2,000 gallon septic tank. Kitchenette wastewater from this Building will also gravity into this 2,000 gallon tank. Effluent from this tank will then gravity into the first compartment of the first existing two compartment 1,600 gallon septic tank,then into the second existing tank, and then into a new 1,200 gallon tank to be ultimately disposed of through the mound system. The second compartment of this 1,200 gallon tank will be the pump, or dose chamber. This chamber will have a Filtered Pump Vault (FPV), and an alternating duplex pump system to pump the effluent north to the new mound system and pressurize for disposal. As referenced below, the mound system is to be 50 ft wide east-west and 130 ft long north-south. A. SEPTIC TANKS AND DOSING TANK Septic tanks store the accumulated sludge, scum and effluent(clear zone)volumes, which in turn affect the treatment of nitrogen within the tanks. There are different methods to size septic tanks tank capacity based on pump-out intervals and average daily flows, which will be used for this project. 12 Chesney Consulting