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March 11,2005 NOA Project Number: E040159A ril Table 1. Typical Quantity of Effluent from Various Sources.- Category Total People Average Quantity per -= Average Daily Flow Person Per Parcel Residential 7 70 gal/day/person _ presidents/day*70 gpd/person per day - =490 gpd. '- Tasting Room 1 13 gal/day/person 1 workers/day* 13 gpd/person 2/7 (workers) per day/ 2 days per -4 gpd �y week.. x TastingRoom 200 5 al da / e_rson_. c 200 customers/week*.5�d/person*2/7 Customersper week = 286 gpd Note —gpd is gallons per day.2/7 is a correction factor for a two-daywork week For the property, the total average daily waste water is 780 gallons per day. riThe average total nitrogen concentration of domestic waste water is normally considered to be 20-85 mg/L-N (Crites and Tchobanoglous,F1998). For the purposes of the nitrate loa g estimates, the long-term average concentration for total nitrogen in waste water is estimated to be 5 mg/L-N. / - 3.4.2 Denitrification Estimate Denitrification is an important process which occurs within the leach field whereby certain bacteria " utilize the oxygen in the nitrate (NO3) and release nitrogen gas (N, to the atmosphere. Denitrification is expressed as a percentage, and-the normally accepted range is 10 percent to 35 percent. Soils with higher.clay content;moist soil conditions, high pH, and organic material denitrify by about 35 percent,and soils with`high sand content and fast percolation rates are estimated to denitrify at a lower rate, about 10 percent to 15 percent. A denitrification factor of 15 percent was selected for the Site. 3.5 Nitrate Loading Scenario A nitrate loading scenario was performed to determine the impact from the proposed project. The scenario utilizes the variables discussed previously which represent the estimated conditions and uses associated with this project. The following table presents a summary of the nitrate loading F! calculation for each parcel. R 6