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w: • S 12 rune 2008 AGE-NC-07-1581 Page 14 of 17 The reasonable or maximum usage of wastewater the one bathroom facility by 30 visitors(customer) is five gallons per day(gpd)per person. Other waste should notcittain appreciable concentrations of nitrogen (workers washing hands and glassware). A total of gpd is the projected total daily ' I waste quantity (nitrogen loading includes 30 visitor bathroom trips/day x 5 gpd= 150 gallons and 2 worker with two bathroom trips/day x Xgpd=-2Tgallons). iS 30 The total nitrate-nitrogen(NO3_N)average concentrations in domestic waste ranges between 20 to 85 milligram total nitrogen liter(mg/1-N)with an average of 45 mg/1-N when washing and sanitation is considered. It is estimated the proposed commercial nitrogen waste concentration will be 65 mg/1-N and a weighted average will be used to calculate the total mg/1-N loading over a long terra for subject property. The weighted average calculation for total nitrogen concentrations for on-site commercial flow is proposed as the following: !60 1 • Commercial volumeSW gallons per day (gpd) • Commercial concentration 65 mg/1-N • The flow concentration of 13,000 mg/1-N gallon DENITRIFICATIONS CAUSED BY SOILS I The process of denitrification is important when utilizing subsurface septic lines and regularly occurs in the soil within the leachfields where bacteria utilize oxygen in the nitrate to release nitrogen gas out to the atmosphere. The denitrification process is controlled by waste concentrations, soil type, annual rainfall, pH of the soils, organic concentration of the soil (TOC) and exposure time to nitrogen. The soils with a high or moderate clay content, higher organic content, high pH and adequate soil moisture denitrify the concentrations by 30 percent and less desirable soils with more sands and faster percolation rates (less moisture and clay content) denitrify only about 10 percent. 9.5. MASS BALANCE OF NITROGEN LOADING i The EHD requires the user to considering all potential sources identified for wastewater generation. Further the EHD supports the use of Hantzsche/Finnemore,or other appropriate formula/model to calculated a mass of nitrogen loading. The Hantzsche/Finnemore (Nr) equation for commercial application: Nr=I x Nu,(1-d)+R x Nb- (I+R) Advanced GeoEnvironmental,Inc.