Laserfiche WebLink
_ 2.05.4 RECLAMATION PLAN <br />The topographic features of the mine site are low rolling sand hills on asemi-arid <br />plain. The surface elevation descends from 4905' to 4775' in a northeasterly <br />direction as shown on the topographic map (Appendix Ql ). There is no surface <br />drainage except during severe thunderstorms when the runoff is into the pits, <br />drainage structures, or reclaimed depressions. There has never been a surface <br />water discharge from the property. All drainage structures have been designed by <br />a professional engineer. , <br />All of the area is covered with 20-40 feet of wind deposited sand. This sand lies <br />immediately above the bedded clay and shale of the Laramie formation. The soil is <br />susceptible to wind erosion. "Blowouts" are common in the area, both on and <br />offsite. <br />Two series of topsands exist in the area. The Osgood is 28 inches thick and the <br />Valent is 6 inches thick. Chazacteristics are described in Section 2.04.9 of this <br />document and listed in the Berg Report (Appendix L-1). <br />All major disturbed areas have been or are being returned to Approximate Original <br />Contour (AOC) except "A" Pit which is presently being used for flyash disposal <br />and "B" Pit which has been used for flyash disposal. Both pits have been reclaimed <br />five (5) feet above the re-established 25 year water table and have a combined <br />capacity of more than thirty (30) yeazs for Coors' present flyash. Both "A" and <br />"B" pits were "grandfathered" under the new Subtitle "D" regulations for future <br />ash disposal. Subtitle "D", "Regulations Pertains to Solid Waste Disposal Sites <br />and Facilities Act, Title 30, Article 20, part 1, C.R.S.", regulated by the Colorado <br />Department of Health (CDH) and Weld County Department of Health (WCDH). <br />The process of dismantling the coal handling facilities is complete. The area has <br />been topsanded and revegetated. CEC disposed of all unsalvageable portions of <br />these facilities in "A" Pit. As per Rule 4.11.4, Disposal of Non-coal Wastes, debris <br />was buried five (5) feet above the water table and four feet below AOC. The bulk <br />of the waste was concrete, metal, rubber, and small amounts of wood. No <br />hazardous material or liquid substances were disposed of in "A" Pit. <br />The long term stockpile of overburden is shown on the Mine Plan map at <br />Appendix M-2. Mass Balance calculations for 1995, indicate that there are an <br />estimated 816,000 (in place) CY stockpiled, and that this existing pile is <br />approximately 20 feet above AOC. Calculations also indicate that if CEC backfills <br />over both "A" and "B" Pits as ash disposal progresses with six (6) feet of <br />overburden, approximately 585,000 (in-place) CY would be needed. An additional <br />two (2) feet of topsand would meet the Divisions cover requirement of eight (8) <br />feet. It is highly unlikely that this stockpile will become inactive due to CDH and <br />• WCDH regulations, which require covering of the ash face every forty eight (48) <br />113 5/96 <br />