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LOGE 1938: Kusalakari NLS Addendum Page 3 <br /> November 20, 2019 <br /> Weighted Average Concentration Calculation <br /> Use Average Daily Estimated Waste Weighted Average <br /> Flow Water Quality Product <br /> Volunteers, non-resident 26 gpd 85 mg/L-N 2,210 gpd-mg/L-N <br /> (14 hr. shift, daily) <br /> Residence 420 gpd 35 mg/L-N 14,700 gpd-mg/L-N <br /> Congregants, 58.7 gpd 85 mg/L-N 4,989.5 gpd-mg/L-N <br /> weekdays <br /> (no kitchen use) <br /> Congregants, 93.9 gpd 85 mg/L-N 7,981.5 gpd-mg/L-N <br /> weekends <br /> (no kitchen use) <br /> Congregants, events 20.3 gpd 85 mg/L-N 1,725.5 gpd-mg/L-N <br /> (4 per year, some kitchen <br /> use) <br /> Retreat Guests 418.5 gpd 35 mg/L-N 14,647.5 gpd-mg/L-N <br /> (overnight on-site) <br /> Retreat Day Visitors 3.6 gpd 85 mg/L-N 306 gpd-mg/L-N <br /> Totals 1,041 gpd 46,560 gpd-mg/L-N <br /> Weighted Average 46,560 gpd-mg/L-N / 1041 gpd = 44.7 mg/L-N <br /> Concentration: <br /> The new nitrate loading calculation is attached to this letter. The assumptions of the <br /> calculation are as follows: <br /> Assumptions for Nitrate Loading Calculation <br /> Variable Value Units Description <br /> Q 1,041 gpd Effluent flow rate <br /> Nw 44.7 mg/L-N Effluent stream concentration <br /> A 5.0 acres Site area <br /> Nb 0.3 mg/L-N Concentration of rain <br /> d 0.25 constant Denitrification factor <br /> R 3.64 inches per year Recharge rate of rainfall <br /> W 2.8 inches per year Uniform waste water loading (calculated) <br />