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U=Environmenta <br /> Titan Environmental Corporation <br /> 7939 E. Arapahoe Rd, Suite 230 <br /> Englewood, Colorado 80112 <br /> Phone (303)850-9852 <br /> April 10, 1996 Fax (303)850 9910 <br /> 5101-004 <br /> Mr. Bryce Romig <br /> Environmental Coordinator <br /> Cyprus Climax Metals Company <br /> Climax Mine <br /> Highway 91 <br /> Climax, CO 80429 <br /> Robinson Lake Cut-off Wall <br /> Inspection and Recommendations <br /> Dear Bryce: <br /> As per your request, I am providing Cyprus Climax with a summary of my inspection of <br /> the Robinson Lake cut-off wall footer conducted on April 4. In addition, I am also <br /> providing recommendations on the treatment of cracks in the wall which were observed <br /> during the site visit. <br /> The site visit was conducted on April 4 under sunny skies. According to Climax <br /> personnel, the cut-off wall footer was poured on March 27. Cracks in the footer were <br /> observed by the contractor during form removal which occurred approximately three days <br /> after the footer was poured. <br /> During the site inspection, the cut-off wall footer appeared to be sound without any <br /> observable signs of porous sections, cold-joints, or aggregate separation. Four to five <br /> cracks were observed in the concrete footer. These cracks were located along the footer <br /> where the section is the thinnest in depth (where the bedrock highs occur). These cracks <br /> were photographed for documentation. All of the cracks observed had a vertical <br /> orientation and had extended through the entire width of the footer. <br /> Based on the appearance of the footer, it appears the intact portion of the footer will <br /> provide a competent physical barrier to ground water flow. However, it is apparent that <br /> the cracks in the footer may provide a potential pathway for ground water migration past <br /> the cut-off wall. Based on my observations, I recommend that the cracks be sealed. I <br /> further recommend that the cracks be sealed using an injected grout to completely fill the <br /> crack void space. <br /> Following are steps that I recommend to seal the cracks in the footer: <br /> C TROJECTSM 01-004\1,061 S 101 004 <br />