2017-06-20_REPORT - M2001019

• Permit No: M2001019
• IBM Index Class Name: REPORT
• Doc Date: 6/20/2017
• Doc Name: Annual Fee/Report/Map
• From: Bent County
• To: DRMS
• Annual Report Year: 2017
• Email Name: AME
• Media Type: D
• Archive: No

• 2.05.4 RECLAMATION PLAN
The topographic features at the CEC mine site are characterized by low rolling sand hills
on a semi-arid plain. Surface elevations range from 4905 feet to 4775 feet,sloping
generally downgradient to the northeast, as shown on the site topographic map presented
in Appendix 0-1. There has been little or no measurable or observed surface water
runoff except during severe thunderstorms when runoff will be accumulated in existing
pit areas, runoff control structures, or reclaimed topographic low(depression)areas.
There has been no observed surface water discharge from the property. All drainage
structures located on site to control surface water runoff have been designed(and
certified)by a professional civil engineer.
The CEC site is covered with 20 to 40 feet of wind deposited sand(eolian sand). This
sand overlies the clay and shale beds of the Laramie Formation(of Cretaceous age). This
soil type is highly susceptible to wind erosion, and consequently, ground surface
blowouts exist in several areas on the site.
Two soil types of topsand exist locally. The SCS designated Osgood soil series is
twenty-eight(28) inches thick and the SCS designated Valent soil series is six(6)inches
thick_ The soil characteristics of each type are summarized in Section 2.04.9 of this
document and discussed in detail in the Berg Report,presented in Appendix L-1.
All major disturbed areas at the CEC mine site have been or will be returned to their
Approximate Original Contour(AOC),including A and B-Pits which have been and are
presently permitted for ash and mine waste rock(herein abbreviated"A/MWR")disposal.
[See Appendix R for technical data relative to the ash and mine waste rock, and for spec.
revisions to the coal/A/MWR supplies.] Both pits were previously reclaimed by CEC to
five(5) feet above the re-established local ground water table. They have a combined
capacity for approximately 35 total years of ash disposal by CEC(ash generated by the
Golden,CO facility only). Both A- and B-Pits are"grandfathered"under the State of
Colorado Department of Public Health and Environment(CDPHE)Subtitle D regulations
governing future ash disposal, dated November 30, 1995 (revised),titled the"Regulations
Pertaining to Solid Waste Disposal Sites and Facilities,6 CCR 1007-2,"and are regulated
by both the CDPHE and the Weld County Department of Health(WCDH).
CEC compiles an annual summary of the activities related to ash disposal at the CEC
mine site. This summary includes; source(s)of ash,quantities'of ash received for
disposal, ash transportation and disposal activities,and maps indicating the progress of
disposal/reclamation activities. This summary information can be found in the Annual
Hydrology and Reclamation Report(AHR report). Monthly documentation of ash source
and quantity, including any disposal issues and how they were resolved, is maintained at
the mine site. Here too are found maps which indicate ash depths and aerial extent of
disposal activity.
• CEC also performs an annual evaluation of the ash disposed at the site. At a minimum
one(1)representative sample each of fly ash and bottom ash is collected from the boilers
at the Trigen power plant(Golden). These samples are laboratory analyzed according to
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