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. 2.05.4 RECLAMATION PLAN <br />The topographic features at the CEC mine site aze characterized by low rolling sand hills <br />on a semi-arid plain. Surface elevations range from 4905 feet to 4775 feet, sloping <br />generally downgradient to the northeast, as shown on the site topographic map presented <br />in Appendix O-1. There has been little or no measurable or observed surface water <br />runoff except during severe thunderstorms when runoff will be accumulated in existing <br />pit areas, runoff control structures, or reclaimed topographic ]ow (depression) areas. <br />There has been no observed surface water dischazge from the property. All drainage <br />structures located on site to control surface water runoff have been designed (and <br />certified) by a professional civil engineer. <br />The CEC site is covered with 20 to 40 feet of wind deposited sand (eolian sand). This <br />sand overlies the clay and shale beds of the Lazamie Formation (of Cretaceous age). This <br />soil type is highly susceptible to wind erosion, and consequently, ground surface <br />blowouts exist in several azeas on the site. <br />Two soil types of topsand exist locally. The SCS designated Osgood soil series is <br />twenty-eight (28) inches thick and the SCS designated Valent soil series is six (6) inches <br />thick. The soil chazacteristics of each type aze summarized in Section 2.04.9 of this <br />document and discussed in detail in the Berg Report, presented in Appendix L-1. <br />• All major disturbed areas at the CEC mine site have been or will be returned to their <br />Approximate Original Contour (AOC), including A and B-Pits which have been and are <br />presently permitted for ash and mine waste rock (herein abbreviated "A/MWR") disposal. <br />[See Appendix R for technical data relative to the ash and mine waste rock, and for spec. <br />revisions to the coallA/MWR supplies.] Both pits were previously reclaimed by CEC to <br />five (5) feet above the re-established local Bound water table. They have a combined <br />capacity for approximately 35 total years of ash disposal by CEC (ash generated by the <br />Golden, CO facility only). Both A- and B-Pits aze "grandfathered" under the State of <br />Colorado Department of Public Health and Environment (CDPHE) Subtitle D regulations <br />governing future ash disposal, dated November 30, 1995 (revised), titled the "Regulations <br />Pertaining to Solid Waste Disposal Sites and Facilities, 6 CCR 1007-2," and are regulated <br />by both the CDPHE and the Weld County Department of Health (WCDH). <br />CEC compiles an annual summary of the activities related to ash disposal at the CEC <br />mine site. This summary includes; source(s) of ash, quantities'of ash received for <br />disposal, ash transportation and disposal activities, and maps indicating the progress of <br />disposaUreclamation activities. This summary information can be found in the Annual <br />Hydrology and Reclamation Report (AHR report). Monthly documentation of ash source <br />and quantity, including any disposal issues and how they were resolved, is maintained at <br />the mine site. Here too aze found maps which indicate ash depths and aerial extent of <br />disposal activity. <br />• CEC also performs an annual evaluation of the ash disposed at the site. At a minimum <br />one (1) representative sample each of fly ash and bottom ash is collected from the boilers <br />at the Trigen power plant (Golden). These samples aze laboratory analyzed according to <br />113 9/06 <br />