2010-07-12_REVISION - M1977211

• Permit No: M1977211
• IBM Index Class Name: REVISION
• Doc Date: 7/12/2010
• Doc Name: Adequacies
• From: DRMS
• To: Castle Concrete Co.
• Type & Sequence: TR15
• Email Name: BMK
• Media Type: D
• Archive: No

DIVISION OF RECLAMATION, MINING AND SAFETY
Department of Natural Resources
1313 Sherman St., Room 215
Denver, Colorado 80203
Phone: [phone]
FAX: [phone]
July 12, 2010
Mr. Mac Schafer
Vice President
Castle Concrete, CO.
444 E. Costilla Ave.
Colorado Springs, CO 80903
Re: M-1977-211, Pike.View Quarry, TR. 15 Adequacies.
Dear Mr. Schafer:
STATE OF COLORADO
COLORADO
DIVISION OF
RECLAMATION
MINING
SAFETY
The Division has reviewed the technical Revision # 15, submitted for the Pike View Quarry, Permit # M-1977-
211.1n addition, to the Division's review, the submittal was also reviewed by the Colorado Geological survey, and
their comments were forwarded to you on June 18th, 2010. The Technical revision requests to be allowed to
conduct additional geo technical investigations so additional data could be collected so Castle Concrete can submit
a final mining and reclamation plan amendment for the site.
The current technical revision proposes to blast and remove some limestone to determine the best mining practice
for the south end,of the quarry and determine the stability of the granite beneath the limestone. It also proposes
to backfill and compact in the north end of Area "H" to fortify the toe of the slide area. Operator proposes to
backfill this area to elevations between 7200 and 7225 feet, which matches the existing production floor elevation
to the east of Area "H". The technical revision also requests, the MLRD Board to allow the operator to process the
aggregate that will be removed during the geotechnical investigation by modifying the cease and desist order
issued on December, 2008. On May 12, 2010, the MLRD BOARD approved the modification of the cease and desist
order to allow Castle Concrete to process the aggregate recovered during the geo technical investigation, in the
processing area. Only material removed during the investigative process is allowed to be processed under the
modified Board Order.
The Division has the following comments regarding the proposed plan; Castle concrete states, "our engineering
staff and Buckley Powder Blasting Engineer believe it will take a great deal of explosives to bring down the
remaining scarp". Prior to granting approval, Castle Concrete must submit a detailed blast and monitoring plan.
The peak particle velocity that can be generated from the expected blast cannot exceed 0.5 ft/second peak particle
velocity. The Division also requires Castle Concrete to provide how they plan to achieve the desired compaction
rate for the area to be backfilled. This can be provided in the form of maximum lift heights to be placed prior to
application of compaction and the desired proctor Castle Concrete plans to achieve. The planned QA/QC, (quality
assurance and quality control) to verify compaction and lift heights should also be included in the response.
In addition the Division expects Castle Concrete to address all the recommendations and comments listed on page
three and four of the June 18, 2010, Colorado Geological Survey's review.
If you havequestions or concerns, please contact me at 303 866 3567 ext 8129.
Sincerely,
B rhan Keffe ew '
Environmental, Protection Specialist
Office of Office of
Minpd 1 and RPrlamatinn