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<br /> <br />STATE ~II ~II~I~~I~~~~~II~ <br />OF COLUi~yU <br />DIVISION OF MINERALS AND GEOLOGY <br />Deparlmem of i Jnlurol Resources <br />I J 1 }Sherman SI_ Foom ? 15 <br />D I v 15 1 0 N O F <br />Denver, Columdo b0?03 <br />Phone: 1}p3) Nnb-3567 MINERAL S <br />FAt: (31)3) t13?-81 Db ~ <br /> GEOLOGY <br />' R E C L A M A T I O N <br />Interoffice MEMORANDUM MINING•SAFETY <br /> B~II Owens <br />to: Steve Renner c"vef"°` <br /> tarry E. Walther <br />q~w~-- E~ecuove Director <br />from: Byreft G. Walker ,~„~n,°I e. Lr,ns <br /> Di"ision Duecmr <br />subject: Reclamation at Sunlight Mine, C-81-046 <br />date: May 25, 1999 <br />As we discussed by telephone, I have read the Documented Quote, Sunlight Coal Mine <br />Reclamation Project (PKA-9-XX,Y) to Interested Contractors, dated June, 1999, and have <br />completed a routine inspection of the site. I appreciate this opportunity to follow up our <br />discussions with some observations for consideration. <br />With regard to TASK 1, COAL MINE WASTE EXCAVATION, please consider removal of the <br />mine waste dump to the east of the material at the crib wall (rail dump run-out). Material eroded <br />from this relatively small dump is not transported to a sediment pond (water quality issue). <br />There does not appear to be any stabilization structures in this dump, therefore it should be <br />relatively easily scraped from the hillside. Please consider removal of the mine waste dump at <br />the faz west end of the site, lower bench. This dump has been dissected by clear water runoff <br />from the upper bench clear water diversion ditch and road drainage from above the site (a culvert <br />under County Road 117 discharges these surface runoffs directly onto the dump). There does not <br />appear to be any stabilization structures in this dump, therefore it should be relatively easily <br />scraped from the slopes of the road fill. Materials from this dump erode into Four Mile Creek, <br />thus this is a water quality issue. Coalmine wastes at the upper portal bench area appear to have <br />an imbedded iron (rail and channel) stabilization framework. The crib wall itself is likely to be <br />anchored by deadmen. Thtts a potential requirement for a cutting torch in the equipment list <br />should be anticipated (to cut the reinforcement for removal and to cut off embedded portions <br />below the final graded surface). <br />With regard to TASK 3, FINAL GRADING, recommend the lower road to the flume and <br />headgate be left if the landowner wants this access. Recommend the grading reestablish the <br />lower sedimentation pond (trap) by construction of a ramp berm at the east end of the lower <br />bench area. Such a sediment trap would capture material eroded from disturbed surfaces of <br />reclamation effort at the lower bench (air portal and dump area) until vegetation is reestablished. <br />Under revegetation of this task, recommend the upper bench be scarified and seeded. This area <br />has many weeds a[ this time. Care should be taken not to disturb the upper (adjacent to and on <br />