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F1 <br /> June 27, 2005 -� � <br /> NOA Project Number: E05087A <br /> calculation for the site and the maximur 'le <br /> assumptions of deep percolation of rain . .~ -- = e effluent. <br /> F <br /> Summary of <br /> RA ' )eep <br /> Result <br /> F1 Acres dation of <br /> Plate (Nc)* (A) Mall(R) <br /> (mg/L-N) a: 9) (in.) <br /> i ro 76 <br /> P' 10 2.3 43.28 1-----��-: <br /> 11 10.0 43.28 5,511 45 10% 5.76 <br /> FjMaximum contaminant level(MCL) foi nitrate in drinking water is 10 mg/L-N. <br /> 4.6 Impact of Nitrate Loading to Nearby Water Sources <br /> 1. k Based on the method and assumptions described,in addition to the geologic setting, the proposed <br /> project will likely not cause a build up of nitrate in the ground water above 10 mg/L-N on the site <br /> F1over the long term. It would take about 5,511 gallons at 45 mg/L (NW) to cause a buildup over 10 <br /> _ mg/L. <br /> F] Since the Site is relatively flat,we do not foresee percolating effluent affecting any surface water <br /> resources. <br /> 5.0 DISCUSSION OF NITRATE LOADING RESULTS <br /> # " 5.1 Total Nitrate Impact <br /> I Based on the method and assumptions described, the result of the nitrate loading balance indicates <br /> that the proposed development on the parcel should not cause a build up of nitrate in the ground <br /> F1 water above 10 mg/L-N over the long term. <br /> If the average daily waste water flow was to exceed 5,511 gallons per day,based on the method and <br /> assumptions described earlier, the development may cause a build up of nitrate in the ground water <br /> to 10 mg/L-N over the long term. <br /> 5.2 Methods of Mitigation <br /> Because of the mass transport of the soil properties. Our office recommends that the new septic <br /> systems use a larger septic tank size and a modified filter bed to mitigate the rapid percolation rate. <br />` Please see section 6.8 of the Soil Suitability Study for septic system recommendations. <br /> 6 <br /> Fj <br />