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n <br /> January 16,2007 <br /> NOA Project Number: E07009A <br /> 4, 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 /> Table 2. <br /> Summary of Nitrate Mass Balance Analysis. <br /> Average Daily Effluent Deep <br /> Result L.eachfield <br /> Acres Flow(Q) Concen- Percolation of <br /> Parcel g/ * (A) (Table 3) tration(Nw) cabin id) Rainfall(R) <br /> M1 r (mg/L-N) �( pd) (mg/L-N) cation(d) (Plate 1) (in.) <br /> + 1 032:2 1 l6 (___872 85 35% 4.0 <br /> * Maximum contaminant level`(MCL) for nitrate in drinking water is 10 mg/L-N. <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 /> r <br />` 4.0 DISCUSSION OF NITRATE LOADING RESULTS <br /> r 4.1 Total Nitrate Impact <br /> f � <br /> Based on the method and assumptions described, the result of the nitrate loading balance indicates <br /> that the proposed_devglopment on the proposed_site„could cause a build up of nitrates in the aquifer <br /> above 10 mg/L-N. Where percolating effluent leaches into the ground,ground writer quality may be <br /> impacted to some degree should the effluent reach ground water. <br /> Fine-grained sediment and the degree of cementation on site can provide an added protection <br /> between percolating effluent at the surface and ground water aquifers.The longer the effluent <br /> remains near the surface,the more treatment is enhanced due to natural processes within the soil. <br /> Ground water is approximately 120 feet below ground surface on the subject property. The soils on <br /> 1 the site were clayey loatns soils of-this type-do not typically present a high risk of excessive mass <br /> transport of nitrate or other constituents of concern. <br /> 4.2 Methods of Mitigation <br /> An engineered treatment system is recommended to address high nitrate levels. <br /> a � <br />