2013-12-16_REVISION - M2013064

• Permit No: M2013064
• IBM Index Class Name: REVISION
• Doc Date: 12/16/2013
• Doc Name: Permit Application Adequacy review
• From: DRMS
• To: Varra Companies, Inc
• Email Name: PSH
• 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]
STATE OF COLORADO
MEMORANDUM
To: Peter Hays, Environmental Protection Specialist
From: Tim Cazier, P.E., Environmental Protection Specialist
Date: December 13, 2013
Re: Varra- Coulson Resource Project, Permit No. M -2010 -049;
Exhibit G — Water Information, Preliminary Adequacy Review
COLORADO
DIVISION OF
RECLAMATION
MINING
SAFETY
John W. Hickenlooper
Governor
Mike King
Executive Director
Loretta Pineda
Director
The Division of Reclamation, Mining and Safety engineering staff (DRMS) have reviewed
Exhibit G — Water Information included in the I I 2 application received on September 18, 2013
for the Varra- Coulson Resource Project.
The review consisted of comparing the application content with specific requirements of Rule
6.4.7 of the Minerals Rules and Regulations of the Colorado Mined Land Reclamation Board for
the Extraction of Construction Materials. Any inadequacies are identified below along with
suggested actions to correct them.
Shadow/Mounding Analysis Letter dated June 27, 2013 from Awes LLC:
1. The letter focuses on Pit 112 and Pit 110. Each pit is unique and as these are pits in a
different location than the Varra- Coulson pit, the DRMS questions the relevance and purpose
of providing this analysis. Please provide a rationale for their inclusion.
2. The DRMS questions the validity of the vector analysis in predicting hydraulic gradients
when the results show an 8 -foot drop across an open pond. Plate 1 — Pit 112 Vector Analysis
(for January 2012) depicts an 8 -foot drop in groundwater elevations (contour 4841 to 4833)
across the pit. A similar result is depicted on Plate 2 — Pit Vector Analysis (for July 2012).
Please explain the validity of these results.
Coulson Gravel Pit Mine Berm Failure Analysis and Flood Control Mitigation Plan dated
September 2, 2013 and prepared by Flow Technologies, LLC:
3. Section 3.2.1, p. 13: The last paragraph of Section 3.2.1 discusses the need to characterize
the geotechnical composition for a complete erosion estimate. Please provide a discussion
Office of Office of
Mined Land Reclamation Denver , Grand Junction • Durango Active and Inactive Mines