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Hantzche and Finnemore Equation Calculator Effluent Quantity (Q) 650 gals/day Hantzche and Finnemore Equation Effluent Stream (Nw) 85 mg/L-N _ I*Nw(1-d)+RNb _ _ _ Q 365 12 Site Area (A) 11.80 Acres Nr (I+R) I A*7.48*43560 Q=Volume of wastewater generated,in gallons per day. Concentration Rain (Nb) 0.30 mg/L-N Nw=Total nitrogen concentration of wastewater from development, in milligrams per liter. Denitrification (d) 0.25 % A= Parcel size, in acres. d =Fraction of nitrate-nitrogen loss due to denitrification in the soil. Average recharge rate of rainfall, in inches 3.64 in/year R=Average recharge rate of rainfall,in inches per year. per year R 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) 0.74 in/year I=Volume rate of water water entering the soil averaged over the gross developed area Total Nitrate-N Concentration of waste , mg/L-N water percolate (Nr) Uniform waste water loading (I) 0.74 Site Specific Considerations Within 1-mile of an area of localized recharge Seasonal high depth to groundwater tluac,S (�o Q, ( p Thickness(in feet)of vadose zone S Total thickness(in feet) of clay in vadose zone and %clay in vadose zone Ul�7i U 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 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 multiple]dwellings or bedrooms over 4.