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F ti' 7 <br /> a _ <br /> September 4, 2007 <br /> NOA Project Number: E05164A <br /> Page 2 <br /> Table 1. <br /> Estimated Average Daily Flow of Waste Water <br /> Total Average Quantity per Average Daily Flow <br /> Category People per Person Per Parcel <br /> Day <br /> Customer Use 200 2.0 gal/day/customer 200 customers * 2.0 gpd = 400 gpd <br /> Employee Use 2 14 gal/day/employee 2 employees * 14 gpd = 28 gpd <br /> Flow From 50 gallons per day for the 3 compartment 05 gpd <br /> Kitchen Sink kitchen sink <br /> Total: 478 gpd <br /> For the revised nitrate loading study,the equation parameters will remain the same except <br /> for the increased flow and total nitrogen concentration of the effluent. As stated in Table <br /> 1, the average daily flow is increased to 478 gpd. The 428 gpd figure previously used was <br /> at a concentration of 60 mg/L-N. The additional 50 gpd from the kitchen sink is at an <br /> estimated concentration of 5 mg/L-N. A weighted average of both indicates a new <br /> combined concentration of water is 54.2 mg/L-N for use in the nitrate loading equation. <br /> The weighted average.calculation is next: <br /> Weighted Average Calculation <br /> 428 gpd x 60 mg/L-N= 25,680 gpd-mg/L-N <br /> 50 gpd x 5 mg/L-N= 250 gpd-mg/L-N <br /> 428 gpd f 50 gpd= 478 gpd <br /> 25680 gpd-mg/L-N f 250 gpd-mg/L N = 25,930 gpd-mg/L-N <br /> 25,930 gpd-mg/L N/478 gpd= 54.2 mg/L-N <br /> Table 2. <br /> Summary of Nitrate Mass Balance Analysis. <br /> Result Acres Average Daily Effluent Leachfiel Deep Percolation of <br /> (Nc) * (A) Flow (Q) (Table Concen- d Rainfall (R) <br /> (mg/L- 1) tration (Nw) Denitrifi- (Plate 9) (in.) <br /> N) w (gpd) (mg/L-N) cation <br /> 4• <br /> 15.3? 118 X47,$ /54.2 15% C� 11.69 <br /> * Maximum contaminant level (MCL) for nitrate in-drinking water is 10 mg/L-N. <br />