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M cf 77 Z11 <br />U.S. Department of Labor Mine Safety and Health Administration l?t?E?T <br />Pittsburgh Safety & Health Technology Center <br />P.O. Box 18233 ; a <br />i1Lh <br />Pittsburgh, PA 152360 <br />a <br />STA7E5 04 <br />Mine Waste and Geotechnical Engineering Division <br />February 23, 2009 <br />MEMORANDUM FOR RICHARD LAUFENBERG <br />District Manager, Rocky Mountain District <br />Metal/ Nonmetal Mine Safety and Health <br />THROUGH: <br />FROM: <br />M. TERRY HO <br />ief, Pittsburgh Safety and Health Technology Center <br />r STANLEY J. MICHALEK <br />Chief, Mine Waste and Geotechnical Engineering Division <br />SUBJECT: Field Investigation of Pit Slope Failure at Transit Mix Concrete, <br />i e View Quarry, Mine I.D. No. 05-01443, Colorado Springs, El <br />Paso County, Colorado <br />As requested, engineers from the Mine Waste and Geotechnical Engineering Division <br />conducted a field investigation at the Pike View Aggregate Quarry, located in Colorado <br />Springs, Colorado. The purpose of the investigation was to investigate an ongoing, large, <br />mass pit slope failure that occurred at about 7:15 a.m. on December 2, 2008. <br />The engineers visited the quarry on December 4 and 5, 2008, and were accompanied by <br />Mr. Tom Stefansky and Mr. Billy Schroeder from the Denver, Colorado, Field Office. <br />Report No. MW09-008, which is attached, provides the details of the investigation, the <br />results of the evaluation, and recommendations for addressing the situation. Please <br />contact this office if you have any questions regarding this report. <br />Attachment <br />?AR ?CEN?'D <br />161009 <br />,4 ,Division of Reclamation, <br />Mining and Safety <br />by? k- <br />cc: M. Skiles - Director, TS <br />W. Wilson - Chief, Safety and Health Division, MNM