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Fi June 27, 2005 <br /> NOA Project Number: E05087A <br /> the following table. <br />� Table 1. <br /> Typical Quantity of Effluent for Pro e <br /> Category Total People per Average Quantity per Average Daily Flow <br /> Day Person Per Parcel <br /> v Business 65 workers* 13 gpd/worker*(5/7) <br /> i <br /> (Office Worker) 65 13 gal/day/worker - 604 gpd <br /> Business 10 workers*5 gpd/worker*(5/7) <br /> (Truck Driver) 10 5 gal/day/worker - 36 gpd <br /> Business 4 S gal/day/customer 4 customers* S gpd/customer*(5/7) <br /> !! Customer - 14 gpd <br /> Note —Gpd is gallons per day. <br /> f —The 5/7 factor is to compensate for a 5 day work week <br /> For the site, the estimated total daily waste water quantity is 654 gallons per day. <br /> !_! The average total nitrogen concentration of domestic waste water is normally considered to be <br /> 20-85 mg/L-N (Crites and Tchobanoglous, 1998). For the purposes of the nitrate loading estimate, <br /> the long-term average concentration for total nitrogen in waste water is estimated to be 45 mg/L-N. <br /> Plate 11 is the estimate for the maximum waste flow that the property can handle without causing a <br /> buildup of nitrates above 10 mg/L-N over the long term. See table 2 fora summary of the nitrate <br /> loading scenarios. <br />'g <br /> Ft <br /> 4.4.2 Denitrification Estimate <br /> Denitrification is an important process which occurs within the leach field whereby certain bacteria <br /> utilize the oxygen in the nitrate (NO3) and release nitrogen gas (N� to the atmosphere. <br /> Denitrification is expressed as a percentage, and the normally accepted range is 10 percent to 35 <br /> percent. Soils with higher clay content,moist soil conditions, high pH, and organic material <br /> denitrify by about 35 percent, and soils with high sand content and fast percolation rates are <br /> F' <br /> _ estimated to denitrify at a lower rate, about 10 percent to 15 percent. <br /> A denitrification factor of 10 percent was selected for the Site. <br /> F1 <br /> 4.5 Nitrate Loading Scenario <br /> } i A nitrate loading scenario was performed to determine the impact from the proposed project. The <br /> scenario utilizes the variables discussed previously which represent the estimated conditions and <br /> P uses'associated with this project. The following table presents a summary of the nitrate loading <br /> 5 <br /> FI <br />