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March 28,2007 <br /> NOA Project Number'E061 I SA <br /> Page 2 <br /> Table 1. <br /> Typical Quantity of Effluent <br /> Category Average <br /> Number Average Quantity Average Daily Flow <br /> Mena Office 2 15 gal/day/employee 2 employees x 15gpd =30 gpd <br /> Restaurant 32 20 gA1/dA7/CU9t0mCr 30 customers x 20 gpd = 600gpd <br /> 20 gal/day/employee 2 employees x 20 gpd=40 M <br /> Mobile Homc 2 70 gal/day/resident 2 residents x 70 gpd= 140.M <br /> Boathouse Toilet 30 5 gal/day/user 30 usets x 5 gpd a 150 gpd <br /> TOTAL %0 gallons pet da <br /> Note —gpd is gallons per day. <br /> For the subject property, the total average daily waste water.quantity is 960 gallons pct day.This <br /> flow is an averagedsj4 flow used to estimate low term averages and is not intended for septic <br /> system sizing,which should use peak usage factors. <br /> Table 2. <br /> Summary of Nitrate Mass Balance is. <br /> Result', Average Daily Flow Effluent Cooccn- Lcaehficld Deep <br /> Parcel (Ne) AA) (Q)(Tabic 3) ttation(Nw) Dcaittif- percolation of <br /> (mg) (A) (gpd) (mg/L-N) ication(d) Plate 9) (n. <br /> N) (plate 9) (in.) <br /> Whiskey <br /> Sllouough gb 4.1 26 960 gpd 45 35% 4.0 <br /> x Maximum contaminant level(MCL)for nitrate in drinking water is 10 mg/L�N. <br /> Impact of Nitrate Loading to Nearby Water Sources <br /> Based on the method and assumptions described,in addition to the geologic setting,we do not <br /> believe the proposed project will cause a build up of nitrate in the ground water above 10 mg/LN <br /> over the long term. <br /> Since the site is relatively flat,we do not foresee percolating effluent affecting any sutface water <br /> resources. <br /> For the project to exceed the EPA's maximum contamination level for nitrate of 10 mg/L-N, the <br /> average daily flow from this project would have to exceed 3,646 gallons per day. <br />