2005-10-24_REVISION - M1979002

• Permit No: M1979002
• IBM Index Class Name: Revision
• Doc Date: 10/24/2005
• Doc Name: Preliminary Adequacy Review
• From: DMG
• To: Lafarge West Inc
• Type & Sequence: TR1
• Media Type: D
• Archive: No

STATE OF COLORADO
DIVISION OF MINERALS AND GEOLOGY
Department of Natural Resources
1313 Sherman Si., Room 215
Denver, Colorado 80203
Phone: [phone]
FAX: [phone]
October 24, 2005
Eric Reckentine
Lafarge West, Inc.
10170 Church Ranch Way, Suite 200
Westminster CO 80021
RECE'VE®
(ICT 3120pq
Division olltginB1~ any GeoloyY
COLORADO
DIVISION OF
MIN &RALS
GEOLOGY
REC LAMATION~MININO
SAF ETY•SQENCE
Bill Owens
Governor
Russell George
Executive Director
Ronald W. Cat[any
Division Director
s / / Natural Resource Trustee
Re: North Delta Pit, Permit No. M-1979-002,, Technical Revision No. 1 (TR-Ol) Preliminary Adequacy Review
Dear Mr. Reckentine:
On October 21, 2005, DMG received your request for Technical revision to the above noted permit. The revision
addresses incorporation of a weed management plan, including tamarisk and Russian olive management, into the
permit. DMG completed the preliminary adequacy review of your application for technical revision. The application
cannot be approved until the following issues are adequately addressed. Please submit a response to [he following
issues as soon as possible, but no later than November 14, 2005 so the decision due date set for November 21, 2005
can be met. If your response or a written extension request are not received by November 14, 2005 this application
may be denied.
Please specify timing for spring and fall management applications, in terms of the growth phase of the target
weeds (ie: Bud to bloom, rosette, bolting, pre-dormant or prior to first frost).
2. Please revise the Russian olive section to indicate that control will be implemented in the summer or
preferably in the fall. Some results have indicated that winter management is not effective for this species and
results in resprouting in the following spring.
DMG strongly recommends that all weed management events be thoroughly documented and included in the
annual report. Documentation should include mapping of grandfathered reclamation, location and extent of
weed patches, identification of species, specification of management method used, timing of the treatment,
and any specifics such as herbicide type, mixture strength, application equipment, temperature, weather, etc.
The report should also include observed results of the effectiveness of the treatment and propose changes
when treatments are proven ineffective.
4. The proposed weed management by rapid turnover of product stockpiles may work for highly active sites.
However, it obviously does not work at this site as most, if not all the product stockpiles (including the
recycled asphalt) have knapweed growing on them. To minimize off-site transport of these weeds, the weed
control plan will need to include provisions to spray the weeds on these stockpiles in an effort to kill the plant,
including the root system, prior to off-site transport of the material.
5. DMG does not recommend mowing or burning of perennial weed species as this generally stimulates root
development and vigor. If mowing is to be used on perennial weed species, please specify details regarding
timing in regards to each species, mow height, clippings management, schedule for recurring mowing, etc.
Office of Office of Colorado