HYDRO22227

• Permit No: M1977208
• IBM Index Class Name: Hydrology
• Doc Date: 2/26/2007
• Doc Name: Inert Material Disposal in C-Pit
• From: DRMS
• To: CEMEX, Inc.
• Media Type: D
• Archive: No

es~ ,~ ~ STATE OF COLORADO
DIVISION OF RECL ATION, MINING AND SAFETY
Department of Natural Resources
1313 Sherman St., Room 215 I
Denver, Colorado 80203 I C O L O R A D O
DIVISION O F
Phone: [phone] RECLAMATION
FfJ(: (303)832$106 ~ MINING
February 26, 2007 - s`
SAFETY
Ms. Monica Sowder~ I
CEMEX ~ Bill Ritter, jr.
Governor
P.O. Box 529
Lyons CO 80540
/ Harris D. Sherman
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Y/ I Ronald W. Cattany
RE: CEMEX, Inc., Lyons Quany; Permit No. M-1977-208 Division Dlretlnr
~i3ert Material Disposal in C-Pit Natural Resource Trustee
Dear Ms. Sowders: I
The Division received CEMEX's notification to dispose of inert material from the. Dowe Flats Quarry (Pemlit
No. M-1993-041) into the C-Pit of the Lyons Quarry. CEMEX estimates that a range of 250,000-400-000
cubic yards of material will be disposed in the C-Pit in order to cover the exposediwater.
I
The Division has some additional comments regarding the additional fill material ,that is to be placed in the C-
Pit. In particulaz, the Division is concerned that the water elevation in the C-Pit n!ill rise and may seep out
through unconsolidated sediments within the highwall or into the upper alluvium.) The letter states that
CEMEX will monitor the presence of water in the pit and keep fill below levels where existing ponded water
could migrate into the surrounding unconsolidated material. CEMEX should also~perform daily visual
inspections of the property to determine if any springs or seeps develop. If springs or seeps are noted,
backfilling must cease and the Division must be notified within 2 working days. Please also inform the
Division as to the limits on the rock size to comply with the standards of Rule 3.1.5(9)(f) to ensure that
material will be placed and stabilized in a manner to avoid unacceptable settling and voids.
During the meeting between the Division, CEMEX, and CEMEX's consultants, all parties agreed to the
submittal of a technical revision to the pernlit by April 1, 2007 to address the following:
I
o ensure that impact to groundwater is minimized and address installation of monitoring wells in the
alluvial formation, ~
o further evaluate the source and migration of water into the C-Pit and develop plans to
minimize/eliminate the source(s) of water migration,
o provide a new cement kiln dust (GIGO) disposal plan that eliminates contact with water in the C-Pit,
and
o evaluate a new CICD disposal plan that eliminates dust suppression by water (this maybe submitted at
a later date due to coordination efforts with the CDPHE). I
I
If you have any questions, please contact me at [phone].
~.' i CW~ I
Enc~rosby
Environmental Protection Specialist I
cc: Cazl Mount; DRMS
David Bird; DRMS
AI Notary; Brown & Caldwell
Paul Banks; Banks & Gesso
Mike Figgs; LREP, Inc.
Office of ~ Office of
Mined Land Reclamation Denver Grand Junction Durango Active and Inactive Mines