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- INC. <br />- - - A Suhsidrarv <br />_ _ of <br />- Wes(enr Fuels <br />Astvaariou, lnc. <br />III IIIIIIIIIIIIIIII <br />999 <br />ia•. p <br />'i3 aIC./ iti 1 lll~'y <br />' 1595 <br />Mr. Dan Mathews <br />Division of Minerals & Geology <br />2148 &oadway, #C5 <br />Grand Junction, CO 81503 <br />July 8, 1996 <br />~3ivisioi c, ,.. c •, <br />~rcr,~Ju~..r.cn <br />RE: T.R. 39, DESERADO MINE C-81-018 <br />Dear Mr. Mathews: <br />I am responding to your letter of May 10, 1996 commenting on the referenced technical revision <br />application for sediment and drainage conVol at the refuse disposal areas. Please note the following <br />remarks. <br />1. The revised page number (IV-23) was in error. It has been corrected as Page IV-24./ <br />2. The construction of permanent ditch segments in refuse area 2/3 perimeter collection <br />ditches and refuse area 4 perimeter collection ditches will be delayed until the final <br />reclamation. Similarly, the revegetation of collection ditches currently subject to <br />deposition of cooly sediment and frequent maintenance will be completed after the final <br />revegetation of refuse piles are completed. Measures will be taken to control sediment <br />and ditch erosion in interim ditches. Such measures may include some or all of Ute <br />following: (i) temporary rock check dams (see Fgure IV-1), (ii) straw bale check <br />dams, (iii) dug out sediment Vap (see Fgure IV-2), (iv) rip rap or other ditch lining, <br />(v) contour ditching along slopes of refuse areas, (vi) land imprinting using sheep's foot <br />compactor for refuse area slopes and (vii) use of a darifying agent (Nalco Enact 7888 <br />or equivalent) for decreasing settling Ume in sediment ponds. The river rock riprap <br />currently in place will not be removed unless the interim measures to control erosion <br />is determined to be unsuccessful. Catch basins will be installed in the eastern RP-2/3 <br />collection ditch about every 100 feet to intercept sediments. If the interim measures <br />are proven unsuccesful after the first predpitation event, the ditch riprap will be <br />removed and replaced after installing an underline filter. However, the permanent ditch <br />segments not affected by the final redamation will be riprapped with graded, angular <br />and durable rocks. Map 77 identifies the a ent segments. ? <br />l>haf S~ e R,~`~ <br />3. Refuse area 5 perimeter ditches are constructed. Seeding of these ditches in all <br />segments except those requiring rip rap placement, the fill slopes of the RP5 pond, <br />and the areas adjoining these disturbed areas, will be completed in the fall of 1996. <br />Suite #305 <br />405 Urban Street <br />Izke~vood, Colorado 80228 <br />Telephone 303/988-9626 <br />Telecopier 303/9868147 <br />