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15 April 2009 AGE-NC-09-1683 Page 15 of 18 related to the production of wine will not be disposed of through the septic system. The maximum usage of wastewater in the new multi-purpose room with one unisex bathroom by250 visitors(the maximum)is 3 gallons per day(gpd)per person,and 4 employees is 6 gpd per person. Additionally,the maximum usage of wastewater in the one unisex bathroom warehouse facility by 3 employees is 6 gpd per person. Other waste should not contain appreciable concentrations of nitrogen(workers washing hands and glassware).A total of 792 gpd is the projected maximum total daily waste quantity(nitrogen loading includes 250 visitor bathroom trips/day x 3 gpd=750 gallons and 7 worker with two bathroom trips/day x 3 gpd=42 gallons). The total nitrate-nitrogen(NO3_N)average concentrations in domestic waste ranges between 20 to 85)ffiilligram 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 wille 65 mg/1-N and a weighted average will be used to calculate the total mg/1-N loading over a long term for site property. The weighted average calculation for total nitrogen concentrations for on-site commercial flow is proposed as the following: .Ude/-viG�� ,� —g�__� • Commercial volume 792 gpd (750 gpd at the multi-purpose room and 42 gpd at the warehouse); • Commercial concentrati n 669/1-N; and • The flow concentration of 51,480 mg/1-N gallon. 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 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: NT-I x NW(1-d)+R x Nb�(I+R) r Advanced GeoEnvironmental,Inc. L