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<br />1.0 Introduction <br /> LACHEL FELICE & Associates, Inc. (LF&A), formerly known as LACHEL and <br /> Associates, Inc. (L&A), Golden, Colorado has prepared this 2006 independent <br />' annual structural geology evaluation for the Specification Aggregates (Spec-Agg) <br /> Quarry located in Golden, Colorado (Figure 1). This study was conducted at the <br />' request of Lafarge West, Inc., owner of the quarry, as a requirement for State of <br /> Colorado, Permit Number M-74-004. The structural geology evaluation <br />' presented herein includes observations and measurements from the quarry that <br /> have been obtained annually by LF&A staff over the past nine years as well as <br /> results of the geotechnical investigation conducted by LF&A in 2003. The <br /> purpose of the annual evaluation is to monitor the impact the bedrock structural <br />' geology has on pit wall stability as mining progresses. The measurements, <br /> observations, and structural analyses have been performed by LF&A geologists <br /> and engineers, and are applicable to the quarry at the time the data were <br /> obtained (April, 2006). <br /> <br /> More specifically, the goals of this study are as follows: <br />i • 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 /> 0 Locate and document any obvious slope instabilities. <br /> <br /> <br /> <br /> <br />