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it - <br /> ! i November 30,2007 <br /> NOA Project Number: E07188A <br /> ` For the property,subject the maximum total daily waste water quantity isA,061 gallons per day. , <br /> l <br /> However, the long term average will be less,which reflects the seasonal and weekly schedule. A five- , <br /> sevenths conversion was used to account for a five day work week in the eight months of <br /> November through June, and a six-sevenths conversion was used to account for a six day works <br /> week in the four months of July through October}Using a weighted average, a total average dai1X <br /> flow from the trucking operation will be approximately 80$ gpd. <br /> f Table 2. <br /> 4 F, Weighted Average Conversion for Effluent Flow <br /> Category Month Gallons per day <br /> Five Day Work Week November- <br /> 8 months x 758 gpd = <br /> (5/7 of 1,061 gpd= 758 gpd) (g J_onths) 6,064 gpd <br /> Six Day Work Week July-October 4 months x 909 gpd= <br /> f (6/7 of 1,061 gpd = 909 gpd) (4 months) "--I, 3,636 gpd <br /> 4 <br /> Total Average Flow 6,064 gpd +3,636 gpd= 9,700/ 12 months = <br /> 848 d <br /> (; Note —gpd is gallons per day. <br /> The average total nitrogen concentration of domestic waste water is normally considered to be <br /> 20-85 mg/L-N with 35 to 45 mg/L-N being typical (Crites and Tchobanoglous, 1998). It is <br /> estimated that commercial use will have higher concentrations of total nitrogen when compared to <br /> residential use. Because the operation will have a shower facility the concentration w e diluted <br /> stgnific�It is estimated that t e average concentration for total nitrogen in waste water for the <br /> prz5lect is approximate-ly-6�L-N over th long <br /> e erm. <br /> 3.4.2 Denrm`frcatrorl Estimate _� � <br /> i <br /> #+ Denitrification is an important process which occurs within the leach field whereby certain bacteria <br /> k 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 /> F1percent. 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 /> estimated to denitrify at a lower rate, about 10 percent to 15 percent. <br /> A denitrification factor of 15 percent was selected for the Site because of the coarse grained nature <br /> 0 of the soils. <br /> 6 <br />