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CALCULATED NITRATE-NITROGEN LOADING FROM THE PROPOSED RESTROOMS <br /> TAKING THE ENTIRE SUBJECT PARCEL AREA INTO CONSIDERATION: <br /> HANTZSCHEIFINNEMORE EQUATION <br /> IN,(1 - d)+R Nb <br /> Nr= (I +R) <br /> Where: <br /> Nr = Resultant average concentration of nitrate-nitrogen in recharge water-(ppm NO3-N) <br /> I = Volume rate of wastewater entering the soil averaged over the gross developed area in inches per yr <br /> Nw = Total nitrogen concentration of wastewater in mg NIL <br /> d = Fraction(%)of nitrate-nitrogen combined loss in the high clay content soil due to: <br /> 1.) Prevention of nitrification and 2.)The denitrification of nitrate molecules that may form. <br /> R = Average recharge rate of rainfall- inches per yr NLS§3.2 <br /> Nb = Background nitrate-nitrogen concentration of rainfall recharge, exclusive of wastewater influences <br /> (ppm NO3-N). <br /> Valuesannd-Assumptions: l <br /> f <br /> I —78,000 gal/s=total W W/yr=10.428 cu ft =0.86 in/yr ) 4d <br /> 3.36 Ac x 43,560 sq ft/Ac x(1 ft/12 in) <br /> Nw= 62 mg N/L <br /> — sume %due to the high percentage of tight silt and clay soil(44%+23%)at the soil-effluent inter f ce. <br /> R = 13 in yr. <br /> o be 0.1 ppm NO3-N <br /> 0.86 in/yr(62 mg N/L)(1 -0.25) 13 in/yr x 0.1 mg/L) <br /> Nr = (0.86 in/yr+ 13 in/yr) <br /> Nr = 3.0 ppm as nitrate-nitrogen(NO3-N), 13.4 as nitrate(NO3) <br /> IV. SEPTIC SYSTEM DESIGN: OPERATIONAL PARAM RS AND COMPONENTS <br /> A. PROPOSED SEPTIC SYSTEM DESIGN <br /> SSS§ 3.7. The design of the leachline/leachfield disposal system is based upon the factors for <br /> efficient operation, disposal field longevity, and environmental protection. An overview of the <br /> system operation to serve the proposed facility is as follows and illustrated on the accompanying <br /> plans: <br /> Influent from the Men's/Wo me ' Re_strooms�n� Break Room will flow into a P&L <br /> Concrete, Inc. standard precast, 1,600 gallon septic t . A Polylok, Inc. PL-250 ef -ntlitter,is , <br /> to be installed at the outlet of this 'feed uent will travel a proximate 240 ft to a <br /> P&L Concrete - 'bution o e e will be eq e <br /> between thre bAl ftlong- �achlines. xIO'LxI2'D sumps a to be installed at the ends of <br /> each leachline. <br /> Page -7- <br /> Chesney Consulting <br />