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3 Bedroom <br />Sand <br />Effluent Quantity (Q) <br />250.00 <br />gals/day <br />Effluent Stream (Nw) <br />40.00 <br />mg/L-N <br />Site Area (A) <br />2.00 <br />Acres <br />Concentration Rain (Nb) <br />1.00 <br />mg/L-N <br />Denitrification (d) <br />0.30 <br />% <br />Average recharge rate of rainfall, in inches <br />per year (R) <br />5.82 <br />in/year <br />Uniform waste water loading I) <br />1.68 <br />in/ ear <br />Total Nitrate -N Concentration of waste <br />water percolate (Nw) <br />I <br />mg/L-N <br />Nr = I*Nw(1-d)+RNb <br />(I+R) <br />IQ*365*12 <br />= <br />A*7.48*43560 <br />I= Volume rate of water water entering the soil averaged over the gross <br />developed area, in inches per year. <br />Nw= Total nitrogen concentration of water water, in milligrams per liter. <br />d= fraction of nitrate -nitrogen loss due to denitrification in the soil. <br />R=average recharge rate of rainfall, in inches per year. <br />Nb= Background nitrate -nitrogen concentration of rainfall recharge at the <br />water table, exclusive of waste -water influences, in milligrams per liter. <br />No <br />Area of localized recharge? <br />60 ft <br />Seasonal high depth to groundwater <br />Uniform waste water loading (I) <br />1.68 35 ft <br />3.5 <br />Depth of vadose zone from bottom of DF to seasonal high groundwater <br />24 ft <br />Total feet of confining layers from bottom of DF to seasonal high groundwater <br />69% % <br />4.3 <br />Percent confining layers in vadose zone <br />7.8 <br />Input Parameters <br />1 point for every 10' of vadose zone <br />Calculated Paramter <br />1 point for every 10% confining layer <br />Result <br />Dispersal Field = DF <br />Q <br />70 gal/person at 2 person/bedroom occupancy <br />Nw <br />35 mg/I; 45mg/I for SFR with 6 or greater bedrooms <br />A <br />parcel size for one SFD, 0.5 parcel size for two SFD, etc. <br />Nb <br />assume 1.0 <br />d <br />Sandy Soils = 0.15 or 15%; Silty Sand = 0.25 or 25%; Clay = .35 or 35% <br />