REV93816

• Permit No: C1981018
• IBM Index Class Name: Revision
• Doc Date: 4/20/2001
• Doc Name: DESERADO MINE PN C-81-018 TR-54 EAST PORTAL SEDIMENT CONTROL
• From: DMG
• To: BLUE MOUNTAIN ENERGY
• Type & Sequence: TR54
• Media Type: D
• Archive: No

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. _ ,~ . .
STATE OF
~`' ; ~`~; III IIIIIIIII
COLORADO
DIVISION OF MINERALS AND GEOLOGY
Department of Na[ural Resources
1313 Sherman St., Room 215
Denver, Colorado 80203
Phone: [phone]
FAX: [phone]
April 20, 2001
Scott Wanstedt
Blue Mountain Energy
3607 County Road 65
Rangely, Colorado 81648
RE: Deserado Mine (Permit No. C-81-018)
Technical Revision No. 54 (TR-54)
East Portal Sediment Control
Dear Mr. Wanstedt:
DIVISION O F
MINERALS
GEOLOGY
RECLAMATION
MINING•SAFETY
Rgl o~
Governor
Greg E. Walther
Executive Director
Michael R. Long
Division Director
The Division has reviewed Blue Mountain Energy Int.'s (BME's) TR-54 submittal for the East Portal
Area Reclamation, including the February 8, 2001 response letter and revised design. Our review
letter dated November 22, 2000, included Comment 7d, which states the following.
It is noted that a number of riprapped permanent drainages proposed in the previous
submittal have been eliminated. Given the extent of steep slopes above the disturbed
area, and the presence of several ephemeral drainages in the pre-mining topography,
the provision for installation of stable drainages in locations of anticipated
concentrated flow would appear to be warranted. Please address this concern and
provide appropriate designs. Areas of potential concern would include the steep
upper section of the drainage Swale feature, the primary drainage tributary to the
Swale, and certain locations along the reclaimed access road which intersect steep
drainage chutes. Permanent channels designed to convey concentrated upland
(native) flow across the reclaimed site will need to be designed, constructed, and
maintained to prevent additional contributions of suspended solids to Scullion Gulch.
BME responded with a revised design which includes a pond and silt fence for treating runoff from
the primary drainage and Swale feature, and a berm with filter fabric outlets for two locations along
the reclaimed road. Two large areas along the reclaimed road have no provisions for controlling or
preventing erosion ,siltation, and contribution of sediment to Scullion Gulch below the reclamation.
It is our determination that the silt fence structure on the primary drainage would be ineffective, given
the anticipated volume of sediment and concentrated flow from intense storm events. Sediment
control measures will be necessary for the road sections for which no sediment controls are currently
specified.