HYDRO24041

• Permit No: C1981019
• IBM Index Class Name: Hydrology
• Doc Date: 10/9/2001
• Doc Name: E-mail that enclosed a PICTURE
• From: BYRON WALKER
• To: CDOH WQCD Carla Lenkey
• Permit Index Doc Type: DMR’s
• Media Type: D
• Archive: No

STATE OF COLOI~DO
DIVISION OF MINERALS AND GEOLOGY
Department of Na[ural Resources
1313 Sherman Sl., Room 215
Denver, Colorado 00203
Phone: [phone]
FAX: [phone]
September 18, 2001
Ms. Cazla Lenkey
Colorado Department of Public Health and Environment
Water Quality Control Division
4300 Cherry Creek Drive South
Denver, Colorado 80222-1530
Re: Colowyo Coal Co
References:
DIVISION OF
MINERALS
GEOLOGY
RECLAMATION
MI NING•SAFETY
Bill Owens
Governor
Greg E. Walther
Executive Director
Michael B. Long
Division Director
1) Colowyo Coal Company L.P. letter of April 6, 2001, Re: DMR Report for Colowyo Coal
Company L.P.; Colorado Waste Water Discharge Permit System Number CO-00045161;
Request for Alternate Limits
2) Colowyo Coal Company L.P. letter of June 14, 2001, Re: Colowyo Coal Company L.P.
(Colowyo); CDPS No. CO-0045161 First Quarter Follow Up Letter
3) Colowyo Coal Company L.P. letter of July 18, 2001, Re: Colowyo Coal Company L.P.
(Colowyo); CDPS No. CO-00045161 First Quarter Follow Up Letter for Outfalls 001 A and
OOSA
4) CARLA J Lenkey e-mail July 26, 2001 9:58 subject Colowyo Coal Company
5) Permit Application Package (Colorado Division of Minerals and Geology Permit C-81-019,
Colowyo Coal Company L.P., Colowyo Coal Mine)
6) Colorado Division of Minerals and Geology (Division) Monthly Inspection Records
Dear Ms. Lenkey:
This letter is in response to reference 4) above. By this reference, you ask if the various outfalis
had capacity prior to the event that was up to a 10 year / 24 hour event. The outfalls are OOSA
(Stoker Coal Loadout Pond), 006A (Loadout Loop Pond) and OOlA (Streeter Pond) (reference
1).
The Streeter Pond (Outfa11001A)
This pond appears to have had capacity prior to the event.
This pond has a design capacity (reference 5, Exhibit 7, Tab 13, Appendix A, 10-14-1998) of
0.84 acre feet of sediment storage and 10.16 acre feet of water storage at the stage of peak
discharge from a 10-year - 24 hour event. The peak discharge of such an event is demonstrated
EH.(