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L <br /> LApril 14, 2006 <br /> /NOA Project Number: E06038A <br /> LV 3.5 Nitrate Loading Scenario <br /> L 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 (Plate 3). <br /> Summary of Nitrate Mass Balance Analysis. <br /> Result Acres Average Daily Effluent Concen- L.eachfield Deep Percolation of <br /> (Nc) * (A) Flow(Q) (Table 1) tration(Nw) DenitrWi- Rainfall(R) <br /> (mg/L-N) (gpd) (mg/L-N) cation(d) (Plate 3) (in.) <br /> t ( 3.9 22.8 788 50 i 25% 5.31 <br /> 6. contaminant level or nitrate in drinking water is 10 mg <br /> /3.6 Impact of Nitrate Loading to Nearby Water Sources <br /> L <br /> The result of the nitrate loading balance indicates that the proposed use should not cause a buildup <br /> of nitrate in the ground water above 10 mg/L-N over the long term. According to the Hantzsche <br /> L and Fen� non and approach, there is a potential for a buildup of nitrates in the ground <br /> watefto 39 rng//_ <br /> /4.0 DISCUSSION OF NITRATE LOADING RESULTS <br /> ` Y 4.1 Total Nitrate Impact <br /> L According to the Hantzsche and Fennemore equation and approach there is a potential for a <br /> buildup of nitrates in the ground water to 3.9 mg/L-N over the long term;this concentration is <br /> below the safe drinking water sta <br /> ` �//4.2 Methods of Mitigation `_- <br /> Because the proposed use should - �j/ ��� <br /> drinking water standard, no mitig - z ��i/f <br /> L /5.0 CONCLUSIONS AND R <br /> Our office concludes that the Si -40 <br /> septic system construction shou <br /> Standardr where applicable. <br /> L a-�- <br /> L <br /> L <br />