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04 January 2013 <br />AGE -NC Project No. 12-2179 <br />Page 6 of 7 <br />At the end of construction, the site will be graded for proper drainage and seeded with <br />native grasses (if required). The permit will require the submittal of a thorough Capping <br />Results Report to document the final volumes of soil cover, once the work has been <br />completed. <br />The final cover design should reduce the existing slopes to low slopes around the entire <br />cover area (plus 1 -foot cover system thickness over entire landfill area). Soil loss or <br />erosion, which is anticipated to be that which normally occurs on fallow land, or the soil <br />loss for the final landfill cover system, will be below the maximum annual allowable soil loss <br />(2.0 tons per acre) in accordance with current EPA guidance documents. <br />Although the average soil loss over the entire slope may be less than the maximum <br />allowable, the largest contribution to any soil loss will come from side slope areas. It is <br />expected that the period of greatest concern for soil erosion would be immediately after <br />topsoil placement and before the vegetation takes hold. Therefore, seeding will occur if <br />native plants do not hold soil by the spring season in order to prevent erosion during this <br />interim period. <br />As the cover material should be native, a layer of topsoil will not be placed over the general <br />fill layer. Native soil should support vegetative growth over the entire landfill cover system. <br />Manual seeding methods such as drill seeding will be used to ensure good soil contact, <br />which is crimped into the soil (instead of hydroseeding or hydromulching). <br />7.0 STORMWATER MANAGEMENT <br />The proposed cover system design for the former landfill area will result in the overall <br />height of the landfill being only 2-3 feet above the surrounding topography. The footprint <br />of the covered land fill will be approximately 4 acres, the current side toes of land filled area <br />is being pulled back inward around much of the landfill to accommodate a perimeter berm. <br />As a result of the new and required cover areas, there will be additional surface water <br />runoff, that should be anticipated from the completed landfill cover. In order to manage the <br />stormwater runoff from the landfill cover, the design incorporates a shallow (12 inches in <br />Advanced GeoEnvironmental, Inc. <br />