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i <br /> Fj n <br /> F1November 30, 2007 <br /> NOA Project Number: E07188A <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 /> F1 Table 2. <br /> Summary of Nitrate Mass Balance Analysis. <br /> F1 Average Daily Deep <br /> Result Effluent Leacbfield <br /> Acres Flow(Q) Percolation of <br /> Parcel (Nc) * Concentration(Nw) Denitrification <br /> (mg/L-N) (A) (Table 3) (mg/L-N) (d) Plate <br /> Rainfall(n) <br /> (gP ) ( ) (in.) <br /> 1 <br /> 1 7.7 21A 80$gpd 1 60 15% 3.3 <br /> * Maximum contaminant level(MCL) for nitrate in drinking water is 10 mg/L- <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 /> Fi - <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 indicatesY+� <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 /> c 7 <br /> F1, 4.2 Methods of Mitigation <br /> Because of the favorable result of the nitrate loading calculation,no In'ti ation measures are <br /> F1warranted. <br /> 4 1 5.0 CONCLUSIONS AND RECOMMENDATIONS <br /> Our office concludes that the Site is suitable for development with the use of a standard septic <br /> system.All septic system construction should follow the San Joaquin County On-Site Wastexater <br /> Disposal Standards where applicable. <br /> I ! <br /> 7 <br />