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November 30, 2007 <br /> NOA Project Number: E07192A <br /> Total <br /> Category People Average Quantity Average Daily Flow <br /> per per Person Per Parcel <br /> Day , <br /> Customers g0 5 gal/day/customer ((80 customers*5 gpd) =400 gpd*5/7) 286 gpd; <br /> M-F <br /> Customers <br /> Saturday (! <br /> 10 5 gal/day/customer (10 customers*5 gpd) =50 gpd*1/7*4/2r—3.6 gpd <br /> Total 1,861 maximum gallons per day average_ <br /> ote gpd is gallons per day. <br /> 5/7ths conversion used to account for a 5-day work week,'/2 nversto ed to account for a half day. <br /> For the subject property,the total daily waste water quantity 's 1,861 gallons er day.A five-sevenths <br /> conversion was used to account for a five day work week, a o e-sevenths c nversion was used to Z' <br /> account for the Saturday shift, and a half conversion was used t for the Saturday half-day <br /> shift. <br /> e ave ge total4is <br /> ro n co entration of domestic waste water is normally considered to be <br /> 20-85 mg L-N w35 to 45 mg -N being typical (Crites and Tchobanoglous, 1998). It is <br /> estimate that corcial use ' have higher concentrations of total nitrogen when compared to <br /> tial use. Iestim at the average concentration for total nitrogen in waste water for <br /> the project is approximately 85�r g/L-N over the lon tg erm. <br /> 3.4.2 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 atm re. — <br /> Denitrification is expressed as a percentage, and the normally accepted range 10 p rce t to 35 <br /> percent. Soils with higher clay content,moist soil conditions,high pH, and oni mat <br /> denitrify by about 35 percent,and soils with high sand content and fast percola ' <br /> Onrates are <br /> estimated to denitrify at a lower rate,about 10 percent to 15 percent. <br /> A denitrification factor f 15 pe cent was selecto fey the Site because of the coarser-grained nature <br /> of the soils. t5 <br /> 3.5 Nitrate Loading Scenario <br /> 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 /> uses associated with this project. The following table presents a summary of the nitrate loading <br /> calculation for the site. <br /> 7 <br />