2011-03-14_REVISION - M1977493 ‎(54)‎

• Permit No: M1977493
• IBM Index Class Name: REVISION
• Doc Date: 3/14/2011
• Doc Name: Exhibit List, Ex. 67
• From: Climax
• To: MLRB
• Type & Sequence: AM6
• Media Type: m
• Archive: No

CMC001613
C
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April 10, 1996
Mr. Bryce Romig
Environmental Coordinator
Cyprus Climax Metals Company
Climax Mine
Highway 91
Climax, CO 80429
Robinson Lake Cut -off Wall
Inspection and Recommendations
Dear Bryce:
Titan Environmental Corporation
7939 E. Arapahoe Rd.. Suite 230
Engle -wood, Colorado Sol 12
Phone: [phone]
Fax: [phone]
5101 -004
As per your request, I am providing Cyprus Climax with a summary of my inspection of
the Robinson Lake cut-off wall footer conducted on April 4. In addition, I am also
providing recommendations on the treatment of cracks in the wall which were observed
during the site visit.
The site visit was conducted on April 4 under sunny skies. According to Climax
personnel, the cut-off wall footer was poured on March 27. Cracks in the footer were
observed by the contractor during form removal which occurred approximately three days
after the footer was poured.
During the site inspection, the cut -off wall footer appeared to be sound without any
observable signs of porous sections, cold joints, or aggregate separation. Four to five
cracks were observed in the concrete footer. These cracks were located along the footer
where the section is the thinnest in depth (where the bedrock highs occur). These cracks
were photographed for documentation. All of the cracks observed had a vertical
orientation and had extended through the entire width of the footer.
Based on the appearance of the footer, it appears the intact portion of the footer will
provide a competent physical barrier to ground water flow. However, it is apparent that
the cracks in the footer may provide a potential pathway for ground water migration past
the cut -off wall. Based on my observations, I recommend that the cracks be sealed. I
further recommend that the cracks be sealed using an injected grout to completely fill the
crack void space.
Following are steps that I recommend to seal the cracks in the footer:
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