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6. September 10, 2004 NOA Project Number: E040104A L3.6 Impact of Nitrate Loading to Nearby Water Sources Based on the method and assumptions described, the result of the nitrate loading balance L indicates that the proposed development on Parcels 1 through 5 may cause a build up of nitrate in the ground water above 10 mg/L-N over the long term. This result is due to the L relatively small lot size, the estimate of minimal deep percolation of rain in the area, and the inclusion of the second dwelling unit in the calculation as required by the EHD. I The result of the nitrate loading balance on Parcel 6 indicates that the proposed development may not cause a build up of nitrate in the ground water above 10 mg/L-N over the long term. This result is due to the large lot size. Since the Site is relatively flat, we do not foresee percolating effluent affecting any surface water resources. L 4.0 DISCUSSION OF NITRATE LOADING RESULTS 4.1 Total Nitrate Impact Based on the method and assumptions described, the result of the nitrate loading balance indicates that the proposed development on Parcels 1 through 5 may cause a build up of nitrate in the ground water above 10 mg/L-N over the long term. This result is due to the ` relatively small lot size, the minimal rainfall in the area, and the inclusion of the second dwelling unit in the calculation as required by the EHD. The result of the nitrate loading balance on Parcel 6 indicates that the proposed development will not cause a build up of ` nitrate in the ground water above 10 mg/L-N over the long term. This result is due to the large lot size. 4.2 Methods of Mitigation To mitigate the problems discussed above, we recommend en ineered septic systems for Parcels 1 through 5. An engineered septic sys em should be designed to mintrmze the impact of nitrates toroun7 water. rt 1 g Q ; 7 l 8