Laserfiche WebLink
Table 4. 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, <br /> weekdays 29.4 gpd 85 mg/L-N 2,499 gpd-mg/L-N <br /> (no kitchen use) <br /> Congregants, <br /> weekends 47.0 gpd 85 mg/L-N 3,995 gpd-mg/L-N <br /> (no kitchen use) <br /> Congregants, events <br /> (4 per year, some kitchen 15.3 gpd 85 mg/L-N 1300.5 gpd-mg/L-N <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 1.8 gpd 85 mg/L-N 153 gpd-mg/L-N <br /> Totals 958 gpd 39,505 gpd-mg/L-N <br /> Weighted Average 39,505 gpd-mg/L-N /958 gpd = 41.2 mg/L-N <br /> Concentration: <br /> Denitrification Reductions <br /> Denitrification is a process that occurs in the septic system drain field whereby certain <br /> bacteria oxidize the nitrate (NO3) in the wastewater and release nitrogen gas (N2) to the <br /> atmosphere. Due to the biologic processes in the shallow soils, nitrogen in the drain <br /> field may undergo a reduction between 10 percent to 35 percent. Soils with higher clay <br /> content, moist soil conditions, high pH, and organic material denitrify by about 35 <br /> percent, and soils with high sand content tend to denitrify at a lower rate of about 10 <br /> percent. <br /> A standard denitrification factor of 25 percent (Hantzsche and Finnemore) was selected <br /> for the Site because of the silt content of the soil present at the percolation test <br /> locations. <br /> LOGE 1938 Page 14 <br />