PERMFILE49647

• Permit No: C1981029
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Section_Exhibit Name: 2.05.3 OPERATION PLAN PERMIT AREA
• Media Type: D
• Archive: No

Attachment I
• BACl~IIIFD MII~ AREA Cffii1TFICATION STATII~ffil15
Badcfilled Mine Area
A. Pit Area
- Designied vs. AS-Built Topograptry
The post~ine topography was designed by the Earth Technology Corporation
in 1980 and was approved, as stipulated, by CMLRD (July 26, 1983). The
post-mine topography map was modified several times at the request of the
surface owner, John Eilts. The post-mine topography was designed to
ensure long term stability with the understanding that the disturbed area
would be topsoiled and revegetated in accordance with the approved recla-
mation plan. In addition, all sediment control structures were designed
order the supervisor and direction of a registered professional engineer,
Joseph K1r11kowskl (Dated January 10, 1983).
After the design and revisions were approved, Sun Coal Company conducted
reclamation activities under the direction and supervision of a registered
professional engineer and pursuant to the approved plan, including the
construction of two sedimentation impoundments. The two sedimentation
ponds were designed aryl constructed to contain and treat the surface water
• runoff from the 30 year - 24 hour storm. The principal spillway was
designed to convey the peak rumff fr+~ the 25 year - 24 hour storm, with
an emergency spillway to convey the peak flay from the 100 year - 24 hour
storm event. All other erosion and sedi~+tation control structures were
designed and constructed and approved by CMLF~ January 10, 1983 to convey
the peak flay runoff from the 10 year - 24 hour storm event, including all
sedimentation traps, ditches and culverts (See Lupoundment Certification
Report, July 1985).
The post-mine topography deslgn was used as a cut and fill design guide to
return the disturbed area to a final topographic configuration. After the
mine area was graded to approximate post-mine topographic design, the
disturbed area was aerially photographed by Horizon Inc. to demonstrate to
the CMLRD that the proposed post-mine topographic configuration was in
compliance wlth the approved plan. In addition to aerially photographing
the disturbed area, surveying was corrlucted by D&D Consultants (steamboat
Springs) to provide additional field control in areas that were graded
after the aerial photograph was taken. The survey was conducted under the
direction of a professional surveyor registered in the State of Colorado.
These maps are currently on file with the State of Colorado (CMLRD).
Based or a review of the approved post mine design contours, and the as-
built topography, the pit area backfill has been placed in approximately
. the same configuration as the approved plan.
- 207 - (Rev. 5/86)