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f <br /> 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 /> i scenario utili2es 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 /> R � <br /> Table 2. <br /> Summary of Nitrate Mass Balance Anal sis. <br /> Average Daily Deep <br /> Result Effluent Leachfield <br /> Acres Flow(Q) Percolation of <br /> Parcel (Nc) * (A) (Table 3) Concentration(Nw) Denitrification Rainfall(R) <br /> (mg/L-N) (gpa) (mg/I--N) (d) (Plate 9) (in.) <br /> 1 5.2 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 /> r- <br /> 3.6 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 /> 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 /> Because of the favorable result of the nitrate loading calculation, no mitigation measures are <br /> warranted. <br /> �� 7 <br />