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Hantzche and Finnemore Equation Calculator Effluent Quantity (Q) 1200.00 gals/day Hantzche and Finnemore Equation Effluent Stream (Nw) mg/L-N 70.00 Nr _ I Nw(1-d)+RNb I _ Q 365 12 Site Area (A) 13.54 Acres (I+R) A*7.48*43560 Q =Volume of wastewater generated, in gallons per day. Concentration Rain (Nb) 0.50 mg/L-N Nw=Total nitrogen concentration of wastewater from development, in milligrams per liter. Denitrification (d) 0.20 % A= Parcel size, in acres. d =Fraction of nitrate-nitrogen loss due to denitrification in the soil. Average recharge rate of rainfall, In inches in/year R= Average recharge rate of rainfall, in inches per year. per year R 3.64 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) 1 19 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) 1.19 Site Specific Considerations Within 1-mile of an area of localized recharge 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 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 Cal"_` Iat-d:P rami,'(~ � � ,y "� d 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.