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l <br /> C) <br /> August 22, 2007 <br /> NOA Project Number: E07109A <br /> F41" For the subject property, the total average da' fl s 1 all ons er da . infelder had <br /> proposed a total nitrogen concentration of mg/L- . We he umber is satisfactory for <br /> residential use, however probably underes i ates the total nitr en for church use. We propose <br /> r <br /> pi <br /> increasing the concentration from 35 mg/L-N to 65�mg/L N <br /> 3.4.2 Denitrification Estimate(Revised fro Meinfeld Report) <br /> F1, Please see section 9 of the SSS/NLS (Kleinfelder, 2007) for regarding denitrification estimates. An <br /> increased denitrification factor of 35 percent is recommended for the site based on the dark, fine- <br /> grained soil conditions. <br /> 3.5 Nitrate Loading Scenario <br /> A nitrate loadingscenario was performed to determine the impact from the proposed project. The <br /> following table presents a summary of the nitrate loading calculation for the parcel. <br /> I <br /> Table 2. <br /> Summary of Nitrate Mass Balance Analysis. <br /> Parcel Result s verage Daily Effluent Leachfield Deep <br /> (Ne)'s (A) low(Q) Concen- Denitrifi- Percolation of <br /> (mg/L-N) able 3) tration(Nw) cation(d) Rainfall(R) <br /> (lpd) (mg/1--N) (in.) <br /> E � <br /> 1 9.9 1.64 110 1 65 1 35% 1 3.27 <br /> * Maximum contamin level(MCL) or nitrate in drinking water is 10 mg/UN. <br /> 3.6 Impact of Nitrat ad' to Nearby Water Sources <br /> I <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 /> over the long term. <br /> Since the site is relatively flat,we do not foresee percolating effluent affecting any surface water <br /> resources. <br /> U <br /> 4.0 DISCUSSION OF NITRATE LOADING RESULTS <br /> Fi <br /> 4.1 Total Nitrate Impact <br /> F-1 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 /> If� � 7 <br /> .A4F <br />