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v <br /> LNovember 27,2006 <br /> NOA Project Number: E06087A <br /> 3.5 Nitrate Loading Scenario <br /> A nitrate loading scenario was performed to determine the impact from the proposed project. The <br /> V 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 parcel. <br /> Table 2. <br /> Summary of Nitrate Mass Balance Analysis. <br /> Result Average Daily Effluent Leachfield Deep <br /> Acres Flow(Q) concen- Percolation of <br /> Parcel g/ * A able 3 tration Denitrifi- <br /> (mg/L-1� ( ) ) meq') cation(d) Rainfall in. <br /> L (gpd) (mg/L-N) (Plate 9)(in.) <br /> With 7.3 26 2,212 gpd 45 35% 4.0 <br /> residence <br /> Without 6.1 26 1,722 gpd 45 35% 4.0 <br /> residence <br /> * Maximum contaminant level(MCL) for nitrate in drinking water is 10 mg/L-N. <br /> 3.6 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/L-N <br /> Lover the long term. <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 nitrate in the <br /> ground water above 10 mg/L-N over the long term. <br /> 4.2 Methods of Mitigation <br /> Because of the result of the nitrate loading calculation,no mitigation measures are warranted. <br /> 8 <br />