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11111 <br />0 SCOPE <br />This report presents the results of our Slope Stability Evaluation for the <br />Pikeview Quarry pit highwall, where a rock slide occurred the morning of December <br />2, 2008. The slide was a rapid failure, with the majority of the movement occurring <br />over a period of less than 2 minutes. The volume of the slide material was <br />estimated by others to be between 1,500,000 and 2,500,000 cubic yards. Our <br />purpose was to evaluate the stability of the existing slide mass and adjacent <br />highwall for safety and to assist the mine operators with improving the long-term <br />stability of the highwall. This report includes descriptions of current conditions, our <br />interpretation of site geology, a description of subsurface and ground water <br />conditions, and our engineering analysis of the stability of the highwall and slide. <br />We believe the study was completed in general conformance with our proposal <br />dated March 12, 2009 (CTLIT Proposal No. CS-09-0036). <br />• The report was prepared based on conditions interpreted from aerial <br />photographs, current topography of the site, discussion with mine personnel, field <br />reconnaissance mapping of the site, review of previous reports provided by the <br />mine, engineering analysis, and our experience. Site-specific investigations for <br />mitigation or observations made during quarry operations may indicate conditions <br />that require revision or re-evaluation of some of the criteria presented in this report. <br />The criteria presented are for the project as described. Revision in the scope of the <br />project could influence our recommendation. If changes occur, we should review <br />the plans and their effect on our recommended mitigation. <br />SITE HISTORY <br />No records exist as to when the first mining occurred on this site, but it <br />apparently was in the late 1800's or early 1900's. Initially the primary use of the site <br />was to produce dusting lime that was used in the many underground coal mines <br />operated southeast of this site in the early 1900's. Apparently, lime for agricultural <br />purposes was also produced. A lime kiln was present on the site at one time. <br />n <br />U <br />TRANSIT MIX AGGREGATES 1 <br />PIKEVIEW QUARRY SLOPE <br />CTLIT PROJECT NO. CS17341-125 <br />S:ICS17000-174991CS17341.000112512. Reports1CS17341-125-R1-Final.doc