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` February 28,2007 <br /> NOA Project Number: E07023A <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 /> Table 2. <br /> Summary of Nitrate Mass Balance Analysis. <br /> Result Average Daily Effluent Leachfield Deep <br /> Acres Flow(Q) Percolation of <br /> Parcel (Ne) '� Concentration (Nw) Denitrification <br /> (mg/L-N) (A) (Table 3) (mg/L-N) (d) Rainfall(R) <br /> (gpd) (Plate 9) (in.) <br /> 1 5.2 q 36 808 gpd 60 15% 3.3 <br /> 2 1 30 0 gpd 60 15 % 3.3 <br /> * Maximum contaminant level(MCL)for nitrate in drinking water is 10 mg/L-N. <br /> U3.6 Impact of Nitrate Loading to Nearby Water Sources <br /> Since the Site is relatively flat,we do not foresee percolating effluent affecting any surface water <br /> resources. <br /> 5 4.0 DISCUSSION OF NITRATE LOADING RESULTS <br /> 4.1 Total Nitrate impact <br /> Based on the method and assumptions described, the result of the nitrate loading balance indicates <br /> that the proposed development on the proposed parcels should not cause a build up of nitrates in <br /> the aquifer above 10 mg/L-N. <br /> 4.2 Methods of Mitigation <br /> w <br /> Because of the favorable result of the nitrate loading calculation, no mitigation measures are <br /> warranted. <br /> F1 <br /> 7 <br /> a <br /> G ! <br />