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side slopes and approximately 100 feet long. The ditch will have adequate storage to contain <br />• the 10-year, 24-hour event (1.7 inches). The runoff volume and ditch volume calculations are <br />shown on the attached spreadsheet. <br />During regrading the earthen berm would be removed and the topsoil from the upgradient <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, silt fencing will be <br />installed along the full length of the downgradient toe of each drill pad prior to reclamation to <br />further reduce the potential for siltation off-site. <br />It 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 attack-mounted drill rig <br />supported by a water truck and supply truck. <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 baclcfilling; cleaning up and <br />removing any trash, debris, drilling materials and supplies; returning the disturbed area to approximate <br />original configuration; replacing salvage topsoil materials in a roughened condition; and revegetatng <br />the disturbed area by broadcast seeding. <br />5.b -Specifically Addressed <br />S.b.l -Eleven (11) drill pads will be constructed on currently undisturbed areas. The other eight (8) <br />sites are located within currently disturbed azeas. 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 o the drill pads outside the <br />currendy disturbed areas is 8,150 cu. yds. In the case of "new" access roads, the topsoil will also be <br />windrowed alongside the access to facilitate replacement. <br />5.6.2 -Three of the proposed locations will require new disturbance to access the sites. These sites <br />aze indicated on the attached Map 1, 2003 Exploration. The new access routes will be field adjusted <br />to reduce the amount of disturbance possible; brush will be pushed aside and the ground leveled just <br />enough to allow the drill rig to access the 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 1,400 feet of new access route <br />containing approximately 0.5 acres of disturbance. Estimated total volume of topsoil to be replaced <br />on the access routes is 390 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 1,770 cu. yds. <br />S.b.3 -The proposed seed mix for exploration site revegetation is presented in the following table. <br />This seed mix is approved at the II-W Mine. Species selection is based on the need for rapid <br />establishment, longevity; and adaptability to a range of soil textures, aspects and slopes. <br /> <br />8 <br />