2018-08-02_PERMIT FILE - M2016054

• Permit No: M2016054
• IBM Index Class Name: PERMIT FILE
• Doc Date: 8/2/2018
• Doc Name: Adequacy Review Response #3
• From: Blue Earth Solutiuons
• To: DRMS
• Email Name: AME
• Media Type: D
• Archive: No

blue earth
SOLUTIONS
July 30, 2018 RECEIVED
Colorado Department of Natural Resources
Division of Reclamation, Mining and Safety AUG 0 2 2018
Attn: Ms. Amy Eschberger
1313 Sherman Street; Room 215 DIVISION OF RECI.AMATION
Denver Colorado, 80203 MINING&SAFETy
RE: Response to Third Adequacy Review Comments for Irwin/Thomas Mine
Permit No. M-2016-054—Aggregate Industries—WCR,Inc.
Dear Ms. Eschberger:
The following discussion and attachments are submitted on behalf of our client, Aggregate
Industries—WCR, Inc., in response to the Adequacy Review comments prepared by the Division
of Reclamation, Mining and Safety dated August 25, 2017 for the Irwin/Thomas Mine 112
Construction Materials Reclamation Permit application. The information and discussion below
address each comment as it was presented by the Division:
Proof of posting responses to Adequacy Review No. 3 comments (response dated
July 30, 2018) with the Boulder County Clerk and Recorder is attached. Additionally, since
a large amount of time has passed since the original permit application and past adequacy
responses were posted with the Boulder County Clerk and Recorder, a new copy of the
original application and the first two adequacy review responses were re-posted with the
Clerk and Recorder.
6.4.5 Exhibit E—Reclamation Plan
1. Prior to affecting land within MA2, MA3, or MA4, Aggregate Industries — WCR, Inc. will
notify the Division in writing and will submit for approval appropriate permit revisions
consistent with the alternative mining and reclamation plans. We understand that the
material submittal is only for notification and updating of mining and reclamation activities
that have already been approved under this permit and a permit amendment will not be
required.
6.4.7 Exhibit G—Water Information
2. Following discussions with DRMS staff, additional St. Vrain Creek flood impact analyses
were performed for the Irwin/Thomas Mine areas. The additional analyses are included in
the attached report, "Flood Impact and Mitigation Evaluation for the Irwin/Thomas Mine".
The evaluation used reports and modeling information that was prepared for the St. Vrain
Creek September 2013 flood mitigation planning effort. The evaluation presents an
assessment of the creek channel stability, flood hydraulics through the project reach,
potential flood related impacts, and recommended impact mitigation measures. Highlights
and recommendations from the evaluation include:
Blue Earth Solutions,LLC P.O.Box 2427 Fort Collins,CO 80522 [phone]