REV89802

• Permit No: C1989074
• IBM Index Class Name: Revision
• Doc Date: 10/13/1993
• Doc Name: RIMROCK STRIP MINE PN C-89-074 RIMROCK COAL CO TR03 TOPSOIL AREA & GATE AREA SAES
• From: DMG
• To: LANDMARK RECLAMATION INC
• Type & Sequence: TR3
• Media Type: D
• Archive: No

•
DIVISION OF MINERALS AND GEOLOGY
Department of Natural Resources
1313 Sherman St., Room 215
Denver, CO 80207
Phone: [phone]
FA%: (3071 872-8106
October 13, 1993
Mr. Mark Kerr
Operations Manager
Landmark Reclamation, Inc.
4901 'S. Windermere Street
Littleton, CO 80120
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Roy Romer
Governor
M¢hael e. Long
Dwision Direuor
RE: Rimrock Strip Mine, Permit No. C-89-074, Rimrock Coal Company,
TR-03, Topsoil Area and Gate Area SAE's
Dear Mr. Kerr:
The Division has reviewed the October 6, 1993 submittal for TR-03 and
has the following questions or comments:
1. The Sedcad runs for SAE #2 (topsoil pile area SAE) and SAE #3 (gate
area SAE) show an area of .OS acres for each, rather than the .89
acres and .25 acres respectively for those areas. Please explain
this discrepancy or rerun the Sedcad runs.
2. The recent submittal does not address directing clean water around
tk~e topsoil pile SAE. If no diversion is planned, then the SAE
must include the upland undisturbed area and runoff. If a
diversion is planned, please submit the designs.
3. A K value of .23 was used in the Sedcad runs for the topsoil pile
area SAE and the gate area SAE. However, from "Soils of Colorado"
by the SCS, 1983, ayon soil has a K value between .15 and .24, down
to a 10 inch depth and capulin soil has a K value of .43 down to a
10 inch depth. Assuming that the topsoil depth was 10 inches, an
average K value would be about .29. Also, in the permit section
2.05.3(4), page 19, an overall K value of .37 was used. However,
rerunning Sedcad with K = .29 did not produce results which were
out of compliance so the designs do not need to be rerun.
4. The implementation of SAE #3 (gate area SAE) is contingent upon
implementation of the road ditch design in TR-07.
5. Please supply page numbers and a permit section number so that the
TR-03 designs can be placed into the permit.
~ III IIIIIIIIIIIIIIII
STATE OF COLORADO
6. Please provide written response to the adequacy letter of
August 20, 1993 for TR-03.