SR0084710_SSNL - Laserfiche WebLink

Home Browse Search

Nitrate Mass Balance Calculation Munsch Property (APN: 027-020-16), 3 -Bedroom Residence 16133 N. Moore Road, Lodi, San Joaquin County, California Terracon Project No. NA217092 Data Input: Effluent Quantity (Q): 200 gals/day Effluent Stream (NW): 40.00 mg/L-N Site Area (A): 1.47 Acres Concentration Rain (Nb): 1.00 mg/L-N Denitrification (d): 15.0% Deep Perc. of Rain (R): 8.90 in/yr Result: Mass Balance (N,): 6.6 mg/L-N MCL Drinking Water Nitrate as N: 10.0 mg/L-N Percent of MCL Nitrate as N 66% Waste Loading (W): 1.83 in/yr Equations: Find W (W) in = (Q) gal x 1 ft3 x 365 day x 1 acre x 12 in x 1 yr day 7.48 gal 1 year 43,560 ft2 1 ft (A) acre 1.83 in/yr(site) =200 gal/day x (1 cu -ft / 7.48 gals) x (365 days/ 1 year) x (1 acre / 43, 560 sq -ft) x (12 in / 1 ft) x (1 site 11.47 acres) N, =WNW 1-d +RN W+R - Hantzsche-Fennemore Equation (Nc) 6.63 mg/L-N = ((1.83 in/yr x 40 mg/L-N x (1-0.15))+(8.9 in/yr x 1mg/L-N))/(1.83 in/yr+8.9 in/yr) Variables: Nc = Average nitrate -N concentration (mg/1) of combined effluent and rainfall percolate (6.63 mg/L-N). W = Uniform waste water loading for study area (in/yr) (1.83 inches/year). Nw = Total nitrate -N concentration of waste water percolate (40 mg/L-N). d = Fraction of nitrate -N loss due to denitrification in the soil (15%). R = Uniform deep percolation of rainfall (8.9 in/yr). Nb = Background nitrate -N concentration of rainfall (1 mg/L-N). Assumptions: 1. Total nitrogen concentration of waste stream based on estimate of 40 mg/L-N. 2. Fraction of nitrate -N loss due to denitrification in the soil is assumed to be 15%. 3. Estimated deep percolation of rainfall is 8.9 in/yr, see deep percolation of rain worksheet. 4. Assume background nitrate -N concentration of rainfall is 1 mg/L-N. Irerracon