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rR = Average recharge rate of rainfall - inches per yr Nb= Background nitrate-nitrogen concentration of rainfall recharge, exclusive of wastewater 'influences (ppm NO3-N) Values and Assumptions: I = 37 people x 15 als/ erson/d x 260 work d/ r— 144,300 gals=total WW/yr= 19 291 cu ft= 1.51 in/yr 3.53 Ac x 43,560 sq ft/Ac x (1 R/12 in) Nw= 103 mg NIL: 20% reduction from effluent filter+ 10% removal from biomat= 74 mg NIL d = Assume 35% due to high clay content soil R = 11 in/yr. But 50% of total area covered w/roofs and asphalt :. 6 in/yr. Nb= Assumed to be 0.1 ppm NO3-N 1.51 in/yr 74 mg NIL 1 - 0.35 + 6 in/yr x 0.1 mg/L) Nr = (1.51 in/yr+ 6 in/yr) Nr 9.8 ppm as nitrate-nitrogen(NO3 N) or 43.6 ppm as nitrate (NO3)f I 37 people- 13% =132'people for Parcel 2 PREDICTED NITRATE-NITROGEN LOADING FROM A COMPLETELY BUILT- OUT PROJECT USING CONVENTIONAL SEPTIC SYSTEMS WITH THE MAXIMUM NUMBER OF PEOPLE ON PARCEL 3: HANTZSCHEIFINNEIVIORE E QUATION IN,, Q - d) +RN Nr= (I + R) Where: Nr= Resultant average concentration of nitrate-nitrogen in recharge water - (ppm NO3-N) I = Volume rate of wastewater entering the soil averaged over the gross developed area in inches per yr Nw= Total nitrogen concentration of wastewater in mg NIL d = Fraction (%) of nitrate-nitrogen loss due to denitrification in the soil R = Average recharge rate of rainfall - inches per yr Nb= Background nitrate-nitrogen concentration of rainfall recharge, exclusive of wastewater influences (ppm NO3-N) Values and Assumptions II= 31 people x 15 als/person/d x 260 work d/yr= 120,900 gals=total WW/yr= 16.1.63 cu ft= 1.49 in/yr 3.00 Ac x 43,560 sq ft/Ac x (1 ft/12 in) Nw= 103 mg NIL: 20% reduction from effluent filter + 10% removal from biomat= 74 mg NIL d = Assume 35% due to high clay content soil R = 11 in/yr. But 50% of total area covered w/roofs and asphalt :. 6 in/yr. Nb= Assumed to be 0.1 ppm NO3-N I 8 Vadey Ag Research