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IV. Construction Summary and Narrative Description of project/construction details, <br /> overview, factors. <br /> The purpose of this project was primarily to rebuild and stabilize Ditch 8, a significant down- <br /> drain channel located on the south side of the Sutey Refuse Disposal Area. The existing channel <br /> was excavated to enlarge the cross sectional area of the channel. Durable rock rip rap was placed <br /> in the channel on approximately twenty foot centers to act as velocity dampening check dams. <br /> Soil was placed in the channel between the check dams. Logs and other organic debris was also <br /> placed within the channel between the check dams. The entire channel length was then seeded <br /> with the Coal Basin Seed Mixture, supplemented with sterile triticale (sp?)to establish a quick, <br /> but short lived, vegetative cover. <br /> An unusually intense rain storm occurred in Coal Basin in late July, 2008. The runoff from the <br /> storm greatly exacerbated existing gullies on Road F near the now-reclaimed Mine 3 load-out. <br /> The extent of erosion was so severe that measures to stabilize the road at the eroded areas was <br /> required. As the Ditch 8 contractor was on-site with appropriately sized equipment, a Change <br /> Order was issued that directed the contractor to re-contour the areas of concern. Because <br /> different remedial measures were required at the areas affected by the rain storm runoff, the work <br /> was completed as machine time. <br /> V. Feature Closure Summary— See Table. <br /> *Feature type using the AMLIS Key Words <br /> **Final Feature Cost includes Contractor total invoiced cost, plus the total cost of materials supplied <br /> to contractor, plus a % of Mob\Demob, plus a % of Revegetation. (Obtain by dividing the total <br /> mob\Demob cost and total Reveg cost by the total number of features) <br /> KEY for Feature Closure Summary <br /> Adit = portal (P)-Count <br /> Shaft = vertical opening (VO)-Count <br /> Inclined shaft, decline, stope = (VO or P)-Count <br /> Hazardous structure = hazardous equipment or facilities (HEF)-Count <br /> Dangerous Highwalls=(DH)-Linear Feet <br /> Dangerous Impoundments=(DI)-Count <br /> Dangerous Pile and Embankment=(DPE)-Acres <br /> Subsidence=(S)-Acres <br /> Surface Burning=(SB)-Acres <br /> Underground Mine Fire=(UMF)-Acres <br />