2004-11-10_REVISION - M1977208

• Permit No: M1977208
• IBM Index Class Name: Revision
• Doc Date: 11/10/2004
• Doc Name: Adequacy Ltr
• From: DMG
• To: Banks and Gesso LLC
• Type & Sequence: TR3
• Media Type: D
• Archive: No

STATE OF COLORADO
DIVISION OF MINERALS AND GEOLOGY '~
Department of Natural Resources
7313 Sherman St., Room 215
Denver, Colorado 80203
Phone: [phone]
FAX: [phone]
November 10, 2004
Ms. Maureen Jacoby
Banks & Gesso, LLC '/
720 Kipling St., Suite 117
Lakewood, CO 80215 /
RE: CEMEX, Inc., Lyons Quarry; Permit No. M-197, 7/-208
~I'R-03; Adequacy Letter r/
Deaz Ms. Jacoby:
COLORADO
DIVISION OF
MINERALS
GEOLOGY
REC LAMATION•M WINO
SAf ETY•SCIEN CE
gill Owens
Governor
Russell George
Eaewtive Director
Ronald W. Cattany
Division Director
Natural Resource Trustee
The Division received Technical Revision (TR-03) for the Lyons Quarry, Permit No. M-1977-208
operated by CEMEX, Inc. The revision was submitted as a result of the Division's inspection of June
24, 2004. The revision involves the retention of mine access roads and highwalls as a component of
the final reclamation plan.
The Division has the following questions that will need to be addressed prior to approval of the
revision:
In 1984, the Division approved a technical revision to leave a highwall along the east and
south sides of the A-Pit Reservoir. At the September 26, 1984 Mined Land Reclamation
Board meeting the revision was approved with a stipulation. The sfipulation states the area
may not be used for recreational purposes as a final reclamation land use, and the public
access to the lake be prevented by using a 6-foot chain link fence with barbed wire aoound the
top. Please see attached letter for further detail.
The Division did not recall seeing such fence around the A-Pit to prevent public access.
Please inform the Division as to the status and location of this fence.
2. Upon further review of the 1984 technical revision request, it does not appeaz that highwall
stability was addressed for the A-Pit. Rule 3.1.5(3) states that if not eliminated, all highwalls
should be stabilized. In order to ensure that highwalls will be left in a manner that is stable,
please provide an engineering stability analysis for the final highwalls to remaining in place
on the A and B Pits. Information for slope stability analysis may include, but would not be
limited to, slope angles and configurations, soil or rock strength determination, physical
chazacteristics of earthen materials, pore pressure information and information on structures
or facilities that could be adversely affected by slope failure.
3. CEMEX proposes leaving a number of roads throughout the property. A number of roads are
concentrated south of the Smead Ditch and west of Pit C. Please justify the need for all of
the road segments in this area. The number of roads and configuration appears to conflict
with the end land use of irrigated pasture.
Office of Office of Colorado
Mined Land Reclamation ARive and Inactive Mines Geological Survey