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:^. r ~: RECEI~JE~ <br />aP~a 2 Z Zooz <br />DISPOSAL OF EXCESS SPILL <br />Fill Area #9 Oiuision of Minerals and Geology <br />First Quarter 2002 Certification <br />February 23, 2002 <br />The CTL Thompson report dated April 27, 2001, "Stability Analysis and Geotechnical Recommendations <br />Lorencito Surface Mine Phase I" addresses the general requirements as also cited in Sections 4.09.1 to <br />4.09.2 of the Colorado Mined Land Reclamation Board for Coal Mining. <br />ACTIVITIES NOTED DiJRING INSPECTION <br />Out-slope of ftll area is being compacted and placed to final grade. Field checks indicate approximately <br />3:1 h:v slope. Competed grade to be verified by survey prior to topsoil placement. <br />SEDIMENT CONTROL <br />Sediment pond construction has been completed in accordance with plans submitted to and approved by <br />the DMG and as-constructed survey/drawings certified by Registered Land Surveyor and Registered <br />Professional Engineer. All surface run-off from the fill areas is directed to this sediment control facility. <br />SITE PREPARATION <br />Organic materials such as brush and trees were removed from the proposed fill area followed by topsoil <br />removal. Design criteria did not require keyway cuts for steeper valleys with minimal soil cover (fill ~9). <br />No evidence of springs or seeps was observed during site preparation. <br />DRAINAGE SYSTEM (UNDERDRAINS) <br />Underdrain construction was completed in advance of fill placement. <br />FILL PLACEMENT <br />CDMG regulations require that spoil be "placed in horizontal lifts in a controlled manner, concurrently <br />compacted as necessary to ensure mass stability". Maximum lift thicknesses are no[ specified. Lifts were <br />placed in accordance with plans specified by the CTL Thompson report. <br />Spoil material was transported to the fill area using a combination of trucks and dozers. Left thicknesses of <br />upto JO feet were placed within the area removed from the fill face by more than 50 feet. Thinner lifts of 6 <br />to 8 feet with leveling and compactive effort supplied by dozers and trucks was utilized as fill placement <br />advances to within fifty feet of the slope face. <br />COVER MATERIAL <br />Approximate final fill contiguration has been obtained. <br />