PERMFILE118270

• Permit No: M2001060
• IBM Index Class Name: Permit File
• Doc Date: 12/5/2001
• Doc Name: GRAVEL MINING IN PROXIMITY TO RAILROAD TRACKS 3B ENTERPRISED DEAKINS PIT FN M-2001-060
• From: DMG
• To: KATE PICKFORD
• Media Type: D
• Archive: No

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STATE OF COLORADO
DIVISION OF MINERALS AND GEOLOGY
Department of Natural Resources
1713 Sherman St., Room ?15
Denver, Colorado 80?03
Phone: [phone]
FAX [phone]
DATE: December 5, 2001
TO: Kate Pickford
FROM: Allen Sorenson ~~
RE: Gravel Mining in Proximity to Railroad Tracks, 9B Enterprises,
Deakins Pit, File .No. M-2001-060
GEOLOGY
R E C L A M A T I O N
MINING•SAFETY
DIVISION OF
MINERALS
Bit l Owens
Governor
ereg E walcne~
Eneculive Dheaor
Michael R. Lung
~Drv~s~on Director
Based on commitments included in [he letter and attachm=nt submitted by 3B Enterprises dated •
November l9; 2001, the Division can permit the gravel pii excavatiua at the Deakins Pit fo be '
conducted to within r10 fee[ of the toe of the railroad embankment. The 40-foot setback is to be
measured from the toe of the railroad embankment to the crest of the gravel pit inslope. The rationale
for the Division's determination that 40 feet is a safe setback resC; primarily ou the Ope~ahar's
commitment to maintain the pit slope at an angle no steeper than 3H:1 V, It is impr.,rt.,:.rtt :hat the'
i~peratur be notified that it is the Division's position that any mining excavation within 4t) fart of the
toe of the railroad embankment will be considered a permit violation and that any l;il s.lopcs within 200
feet of the toe of the railroad embankment found to be steeper than 3H:1`d will also he considered a .
permit violation. The requirement to maintain 3H:1 V slopes with 200 feet of the railroad embankment
is applicable both during the conduct of operations at the pit and at the ttme of reclamation. The
Operator may gain approval of less restrictive setbacks and pit slope requirements by securing an
agreement with the railroad in accordance with §34-32.5-115(4)(e), C.R.S. or by submitting
quantitative slope stability analyses demonstrating that less restrictive criteria will be protective of the
railroad.
As a general rule, the Division considers the stability of 3H:1 V cut slopes in a sand and gravel deposit
to be axiomatic. The Division will also typically approve setback distances from structures to near
vertical gravel pit highwalls that are at least two-times the maximum pit depth, without requiring any
quantitative slope stability analysis. There are site specific exceptions to these guidelines, but none
appear applicable to the slopes under consideration at the Deakins Pit.
ec: Carl Mount, DMG (vin e/ecrronic transmission)
c U1yDocumcnis\Deal:ins Pit Slopes.duc