HYDRO24789

• Permit No: C1981019
• IBM Index Class Name: Hydrology
• Doc Date: 10/25/1995
• Doc Name: COLOWYO COAL MINE C-81-019 EAST TAYLOR POND AS BUILT MAP & CERTIFICATION
• From: DMG
• To: COLOWYO COAL CO
• Permit Index Doc Type: PROF POND CERTIFICATIONS
• Media Type: D
• Archive: No

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STATE OF COLORADO
DIVISION OF MINERALS AND GEOLOGY
Department of Natural Rewurces
I) 13 Sherman 51., Room 215
Denver, Colorado 80203
Phonc: 1303) BhG-3567
FAX: 13031 R}2-8106
October 25, 1995
Mr. Juan Garcia
Colowyo Coal Co. L.P.
5731 State Highway 13
Meeker, CO 81641
RE: Colowyo Coal Mine (C-81-019)
East Taylor Pond; As-Built Map & Certification
Dear Mr. Garcia,
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DEPARTMENT OF
NATURAL
RESOURCES
Hoy Romer
Governor
lames 5. lochhead
Executive Director
michael B Long
Division Dueaor
The Division of Minerals and Geology received the East Taylor Pond certification and As-
Built Map on October 11 and October 24, 1995. The Division has the following comments
regarding the East Taylor Pond As-Built Map and certification signed by Steve Hinkemeyer;
1. The East Taylor Pond As-Built Map depicts a pond embankment height of 22 feet.
The embankment appears to begin at the upstream toe 6932' elevation and end at
the 6954' elevation (crest of the emergency spillway).
Rule 4.05.6(13)(b) requires sediment ponds with embankments greater than 20 feet
in height, to be in compliance with 30 CFR 77.216-3. It appears that the pond
embankment exceeds 20 feet in height and should be permitted with MSHA and
inspected to meet the requirements of this rule.
2. The East Taylor Pond As-Built Map depicts the constructed location of the primary
and emergency spillways. The top of the primary spillway is located at 6952'
elevation and the bottom of the emergency spillway is located at 6954' elevation.
According to the As-Built Pond Map, the distance between these spillways is two
feet.
The East Taylor Pond design approved under TR-33 warrants a three foot span
between the primary and emergency spillways. The first SEDCAD design prepared
by Colowyo (stripping area of 68.6 acres) reveals the stage of the primary spillway
(SW#1) is at 6959' elevation. The peak stage of the 10-year 24-hour event is at
6961' elevation while the emergency spillway stage (SW#2) is at 6962' elevation.