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7;el // <br />Technical Revision <br />Pikeview Quarry <br />M-77-211 <br />Castle Concrete Company <br />January 2010 <br />RECEIVED <br />JAN 14 2010 <br />pivisiorl oo <br />opining and 3afetY <br />r <br />PURPOSE OF REVISION: To allow Castle Concrete to use explosive charges placed in the existing scarps located in the southwest portion <br />of the Pikeview Quarry to help remove unstable material located within the current permit area. <br />REASON FOR REVISION: In December of 2008 a landslide occurred at the Pikeview Quarry, located in northwest Colorado Springs, <br />Colorado. In June of 2009 the Mine Land Reclamation Board ordered Castle Concrete Company to prepare a new mining and reclamation <br />plan for the Pikeview Quarry, in the form of an amendment to the current mining and reclamation plan. The order called for the amendment <br />to be submitted to the DRMS no later than May of 2010. In cooperation with the DRMS, Castle Concrete installed a Lieca monitoring station <br />within the quarry to monitor the landslide and in September of 2009 a second landslide occurred. <br />Castle Concrete's geotechnical engineers need access to the quarry for the purpose of collecting data to assist in the preparation of the new <br />mining plan. Currently the data from the monitoring equipment shows there is movement in the area known as the southern scarp. There has <br />already been a second slide and the geotechnical personnel are unwilling, and rightfully so, to work in the area until the hanging material is <br />either removed or stabilized. <br />Without the geotechnical data the amendment cannot be prepared in time to submit to the DRMS by the May 13, 2010 deadline.