REV98688

• Permit No: C1982055
• IBM Index Class Name: Revision
• Doc Date: 9/22/1993
• Doc Name: RATON CREEK MINE PN C-82-055 ENERGY FUELS MINING CO TR-07 SCA SUMP & DITCH DESIGNS ADEQUACY REVIEW
• From: DMG
• To: ENERGY FUELS MINING CO
• Type & Sequence: TR7
• Media Type: D
• Archive: No

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STATE OF COLORADO
DIVISION OF MINERALS AND GEOLOGY
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Department of Nawral Resources se
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131 3 Sherman SI , Room 21 5
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Denver, CO 80207 • ~
Phone: [phone] 'evb
FA%~ (3071 8)28106
Roy Romer

September 22, 1993 Governor
Michael B. Lung
Orviswn Oiceaar
Mr. Al Weaver
Mine Engineer
Energy Fuels Mining Company
P.O. Box 449
Florence, CO 81226
RE: Raton Creek Mine, Permit No. C-82-055, Energy Fuels Mining
Company, TR-07, SCA, Sump and Ditch Designs, Adequacy Review
Dear Mr. Weaver:
The Division has reviewed Energy Fuels' submittal for TR-07 and have
the following questions or comments:
1. Because the three sumps at the Santa Fe loadouts are the last
sediment control structures before discharge offsite, they are
considered sedimentation ponds. As such, they must be designed,
certified and inspected pursuant to Regulation 4.05.6(10). If
the pond at the Santa Fe loadout no. 2 has a partial berm, then
Rule 4.05.6(11) applies. Please submit designs for the three
ponds at the Santa Fe loadouts, per Rule 4.05.6(10) and per
Rule 4.05.6(11), if applicable.
2. The designs for the Santa Fe loadout ponds use a 10-year 24-hour
event to calculate the runoff volume for total containment.
However, Regulation 4.05.6(6) requires that a 25-year - 24-hour
event be used for designing a total containment pond. Please
resubmit the pond designs for the Santa Fe loadouts nos. 1 and 2,
using the 25-year - 24-hour event.
3. Regulation 4.05.6(6) requires that the water in a total
containment pond be removed. Please describe the method that the
operator will use to dewater these ponds.
4. In order for the topsoil and trailer area to qualify as an SAE,
it must be demonstrated that the effluent from this area will be
in compliance with regulations, namely, the .5 ml/liter standard
for settleable solids. Please submit such a demonstration for
the topsoil and trailer area.
5. The channel design for "TS 1 upper" uses a design peak flow of
.23 cfs. However, from the submitted sedcad run, it appears that
the design peak flow should be .58 cfs. If this is true, please
rerun the channel design for "TS 1 upper".