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NITRATE -NITROGEN IMPACT MITIGATION <br />NLS§ 4.1, 4.2 The leachfield perforated piping should be installed as high in elevation as possible <br />to take advantage of evaporation during favorable months of any given year. Deep-rooted grasses <br />may be planted over the disposal area to aid in evapotranspiration and take-up nitrogen in the form <br />of nitrate and ammonium. Deciduous and evergreen plants may be planted no closer than 15 ft <br />from any leachline to prevent root infiltration. During the fall and winter months, seepage pits may <br />manage excess effluent volumes that cannot be managed by the leachlines. Additionally, during <br />the rainy season, nitrification is suppressed during the colder months of the year, therefore making <br />it beneficial for the disposal piping to be placed high in elevation where the soil/effluent interface <br />is cooler. <br />SSS§ 6.8. The long-term management of effluent by the leachlines exclusively can be based on <br />the long-term acceptance rate (LTAR) of 0.1 gallons/sf/day. For a five bedroom house, 280 lineal <br />feet of leachline is required (4 - 70 ft LL). Considering an application area of 4 sf/ft of leachline = <br />280 ft x 4 sf/ft = 1,120 sf x 0.1 gals/sf/day = 112 gpd. A recommended addition of one additional <br />leachline (and one additional seepage pit) increases management to: 1,400 sf x 0.1 gals/sf/day = <br />140 gpd. Therefore, the seepage pits will eventually management most of the effluent flow <br />volumes. <br />Page -6- <br />Chesney Consulting <br />