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FNw <br /> r = Resultant average concentration of nitrate-nitrogen in recharge water-(ppm NO3-N) <br /> = Volume rate of wastewater entering the soil averaged over the gross developed area in inches per yr <br /> = Total nitrogen concentration of wastewater in mg NIL <br /> = Fraction(%)of nitrate-nitrogen loss due to denitrification in the soil <br /> = 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 /> Values and Assumptions: <br /> I=2 people/bedroom x 4 bedrooms total x 70 PaWrerson/d=560 Pod x 365d/v=total 204,400 WW/yr=27.326 cu H=3.77 in/yr <br /> 2.00 Ac x 43,560 sq ft/Ac x (111/12 in) <br /> Nw=62 mg N/L <br /> d = Assume 25% due to high percentage of fine-grained clay soil. <br /> R = 15 in/yr. <br /> Nb= Assumed to be 0.1 ppm NO3 N <br /> 3.77 in/yr(62 mg N/L) (I - 0.25)+(15 in/yr x 0.1 mo-/I-) <br /> Nr = (3.77 in/yr+ 15 in/yr) <br /> Nr = 9.4 ppm as nitrate-nitrogen (NO3-N)or 41.9 ppm as nitrate(NO3) <br /> Respectfully submitted, o tofessi° <br /> IN <br /> CHESNEY CONSULTING 44 <br /> Che � <br /> aNo.75479 a <br /> Ion Ches ey,PE <br /> Registere Civil Engine r#C75479 aCivil <br /> r o <br /> o <br /> of Calit°t <br /> Page 2 of 2 <br /> Chesney Consulting <br />