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Hantzche and Finnemore Equation Calculator '7 V V34 9 Effluent Quantity ( Q) 700 . 00 gals/day AleHantzche and Finnemore Equation Effluent Stream ( Nw) 40 . 00 mg/ L- N _ I * Nw( 1 - d ) + RNb _ Q * 365 * 12 22 . 68 Site Area (A) Acres Nr (I + R) I A* 7 . 48 * 43560 Q = Volume of wastewater generated, in gallons per day. Concentration Rain ( Nb ) 1 . 00 mg/ L- N Nw = Total nitrogen concentration of wastewater from development, in milligrams per liter. Denitrification (d ) % A = Parcel size, in acres. 0 . 10 d = Fraction of nitrate-nitrogen loss due to denitrification in the soil . Average recharge rate of rainfall , in Inches R = Average recharge rate of rainfall, in inches per year. per year R 3 . 00 In/year Nb = Background nitrate-nitrogen concentration of rainfall recharge at the water table, exclusive of waste-water influences, in milligrams per liter. Uniform waste water loading ( I ) 0 . 41 in/year I = Volume rate of water water entering the soil averaged over the gross developed area Total Nitrate- N Concentration of waste water percolate ( Nr) mg / L- N Uniform waste water loading ( I ) 0 . 41 Site Specific Considerations . . . . . . . . . . . . . . . . 1 - Within 1 - mile of an area of localized recharge b� Seasonal high depth to groundwater Thickness ( in feet) of vadose zone Total thickness ( in feet) of clay in vadose zone and % clay in vadose zone p Number of OWTS in 1 - mile radius of site, location and distance of municipal supply wells Nitrate concentration in onsite well , nearby water wells, public well Other sources of nitrate in 1 - mile radius Input Parameters Number of water wells in 1 - mile radius of site, or service by public water system Calculated Paramter Date of water well installations at the site, in area Depth of wells, depth of grout seals Dispersal Field = DF Within a city Sphere of Influence Vadose Zone = bottom of DF to season high groundwater Number of sewered homes within 1 -mile radius of site Seasonal High Groundwater = highest groundwater table since 1980 per CA Irrigation Management Information System (CIMIS) SJC Flood Control Maps (typically 1983 or 1997) Deep Percolation from Rainfall Data ( 2014- 2018) Deep Percolation from Rainfall = Rainfall- Evapotranspiration Station Annual Ave (in ) Annual Ave (%) Oakdale ( 194) 3 . 29 29 % Ripon (249 ) 3 . 12 26 % Manteca ( 70 ) 3 . 62 32 % Holt (248) 3 . 72 31 % Staten Island ( 242) 12 . 6 55 % Note : Additional wastewater nitrate ( Nw) contribution should be included for the additional wastewater quantity (Q) added for multiplel dwellings or bedrooms over 4.