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STRUCTURAL GEOLOGY EVALUATION <br />' SPECIFICATION AGGREGATES QUARRY <br /> 1.0 Introduction <br /> LACHEL FELICE & Associates, Inc. (LF&A), Golden, Colorado has prepared this <br />' 2007 independent annual structural geology evaluation for the Specification <br /> Aggregates (Spec-Agg) Quarry located in Golden, Colorado (Figure 1). This <br /> study was conducted at the request of Lafarge West, Inc., owner of the quarry, <br /> as a requirement for State of Colorado, Permit Number M-74-004. The structural <br />' geology evaluation presented herein includes observations and measurements <br /> from the quarry that have been obtained annually by LF&A staff over the past ten <br />' years as well as results of the detailed geotechnical investigation conducted by <br /> LF&A in 2003. The primary purpose of the annual evaluation is to monitor the <br />' impact the bedrock structural geology has on pit wall stability as mining <br /> progresses. The measurements, observations, and structural analyses have <br />' been performed by LF&A geologists and engineers, and are applicable to the <br /> quarry at the time the data were obtained (January, 2007). <br /> More specifically, the goals of this study are as follows: <br /> • Map and photograph geologic discontinuities along each exposed quarry wall <br /> and utilize the new data in validating and updating the existing structural <br />' geology database; <br /> • Analyze the new data relative to the existing data in order to verify and/or <br /> modify existing conclusions, and to investigate possible emerging trends; <br /> • Review and characterize the existing stability conditions at the quarry relative <br /> to the current long-term mine plan; <br /> • Locate and document changes in groundwater conditions; <br /> • Locate and document any obvious slope instabilities. <br />' -1- <br />