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FJ March 11, 2005 <br /> NOA Project Number: E040159A <br /> Table 2. <br /> Summary of Nitrate Mass Balance Analysis. <br /> Plate Result Acres Average Daily Effluent Leachfield - Deep <br /> (Nc) * (A) Flow(Q) Concen- Denitrifl- Percolation of - <br /> (ng/L-N) (Table 3) tration(Nw), cation (d) Rainfall(R) <br /> (gpd) (mg/L-N) (Plate 9) (in.) <br /> 10 7.3 1 7.55 1 780 45 15 6.84 <br /> * Maximum contaminant level(MCL) for nitrate in drinking water is 10 mg/L-N.. <br /> - I <br /> Fj3.6 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 7.3 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 /> F! <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 /> kthat the proposed development on the proposed parcels may should not cause a build up of nitrate 1 <br /> in the ground water above 7.3 mg/L-N over the long term. <br /> F14.2 Methods of Mitigation <br /> Because of the favorable result of the nitrate loading calculation,no mitigation measures are <br /> F! proposed. <br /> 5.0 CONCLUSIONS AND RECOMMENDATIONS <br /> r <br /> Our office concludes that the proposed project will not cause a build up of nitrates above 7.3 <br /> mg/L-N in the ground water. We recommend the EHD guidelines be followed for the construction <br /> Fi of the septic system. <br /> ' 5.1 Signatures <br /> The signatures of the environmental professionals involved in the preparation of this report can be <br /> found on the cover sheet at the front of-this package. <br /> F1 <br /> 7 <br />