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the 10-year, 24-hour event (1.7 inches). The mnoff volume and ditch volume calculations aze <br />• shown on the attached spreadsheet. <br />During regrading the eazthen berm would be removed and the topsoil from the up-gradient <br />berm would be spread and left in a roughened condition to reduce the potential for erosion <br />until revegetation is accomplished. On these small areas it is believed that leaving the <br />surface in a roughened condition is sufficient sediment control. However, where the terrain <br />is extreme or conditions dictate, silt fencing will be installed in appropriate locations to <br />further reduce the potential for siltation off-site. <br />Tt is anticipated that only one hole will be drilled per pad location. However, each drill pad location <br />could have a maximum of two holes: one pIlot rotary hole to locate the coal and a second (twin) hole <br />to recover core samples of the coal interval. The holes will be drilled using a truck-mounted drill rig <br />supported by a water truck and supply track. <br />Each exploration drill hole will be plugged, sealed, and abandoned in accordance with Rule 4.07. The <br />drill pads will be reclaimed by allowing the mud pit to dry out then backfilling and regrading; <br />cleaning up and removing any trash, debris, drilling materials and supplies; returning the disturbed <br />area to approximate original configuration; replacing salvage topsoil materials; and revegetating the <br />disturbed area by broadcast seeding. <br />S.b -Specifically Addressed <br />S.b.l -Ten (10) drill pads will be constructed. Each pad will be approximately 100 feet by 100 feet <br />(0.23 acres) in size. Salvaged topsoil will be windrowed and placed immediately adjacent to the <br />disturbance area. Estimated total volume of topsoil to be replaced on the drill pads is 7,400 cu. yds. <br />• In the case of "new" access roads, the topsoi] will also be windrowed alongside the access to facilitate <br />replacement. <br />S.b.2 -Five of the proposed locations will require new disturbance to access the sites. These sites are <br />indicated on the attached Map 1, 2003 Exploration. The new access routes will be field adjusted to <br />reduce the amount of disturbance possible; brash will be pushed aside and the ground leveled just <br />enough to allow the drill rig to access [he pad location. In general the routes will be about 15 feet <br />wide with any brush or trees pushed off to the side and any topsoil removed for road "leveling" will <br />be windrowed for easy replacement. There will be approximately 2,000 feet of new access route <br />containing approximately 0.7 acres of disturbance. Estimated total volume of topsoil to be replaced <br />on the access routes is 550 cu. yds. <br />Each drill pad will contain an excavated 25-foot by 25-foot by 4 -foot mud pit (93 cu. yds.) <br />Estimated total volume of backfill to be returned to the mud pits is 930 cu. yds. <br />S.b.3 -The proposed seed tnix fox exploration site revegetation is presented in the following table. <br />This seed mix is approved at the Yoast Mine for application on topsoil stockpiles and roadside <br />disturbance. Species selection is based on the need for rapid establishment; longevity; and adaptability <br />to a range of soil textures, aspects and slopes. <br />r~ <br />U <br />