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18 July 1984 <br />Page 4 <br />and erosiona.3•dharacteristics of regraded surface coal mines in Colorado. 11 <br />A complete study of this 10 acre drainage basin will be provided if the staff 1 <br />,~ <br />deems it to be required. ~~ ~~~ <br />V' Lyl,v <br />TIPPLE AREA, ORPHAN AND NORTH ORPHAN PITS, AND REFUSE PIT ------- ~ ll~ <br />,~J <br />Included in this proposed plan are portions of Exhibits 11 and 21, contained <br />in Volume IV of the approved plan. These exhibits indicate use of some of <br />these areas by neighboring mining operations, by agreement with GEC. A time <br />period of some 4; years following mid 1982 is suggested in Exhibit 21. It is <br />suggested that timetables for these areas be subsequent to those of the West <br />pit, East pit, and the two overburden stockpiles, since those most recently <br />disturbedareas are the ones most critical in terms of reclamation urgency. <br />TOPSOIL -------- <br />Topsoil quantities are limited, and it is felt that topsoil may have to be <br />spread somewhat thinner than that envisioned in the original plan. <br />At a depth of six inches, the topsoil estimated in the three stockpiles, <br />(35,000 yd3), would cover 43 of the 48 affected acres. This estimate may be <br />in error, as the contractor who moved this topsoil remembers it to be some <br />28,000 yd3. <br />It would be possible to acheive full coverage with a thinner layer of topsoil, .,~ <br />but this proceedure might raise some question as to the viability of the result- ,R1~,. <br />ing vegetation. It is possible that some topsoil could be brought in from ad-~'~' <br />'. <br />joining mining operations, (a distance of 2 to 3 miles), but it is not known how ~ <br />much would be available at the times it would be needed by GEC. <br />~'• <br />REVEGETATIOrt' REQUIREMENTS ------- <br />It is proposed that the revegetation plan as previoulsy approved be used, as it ~~ ~~ <br />is a good mixture far this area. See Attachment A-Vol. IV, and page 2.05-65 in ti~f <br />Volume I. (Attached) <br />SEDIMENTATION PONDS AND COMPLETED SLOPES ------ <br />Sediment ponds will be monitored and cleaned when at 60ro of capacity with a yyd3 <br />dragline. <br />Gullies and rills over nine inches in depth on completed slopes will be staked <br />with hay or straw bales at 50 ft. intervals to reduce further erosion, and assist <br />in natural filling. Slopes will be monitored to assure timely restoration. <br />