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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 />independent annual structural geology evaluation for the Specification Aggregates <br />(Spec-Agg) Quarry located in Golden, Colorado (Figure 1) for the 2008 year. This study <br />was conducted at the request of Lafarge West, Inc., owner of the quarry, as a <br />requirement for State of Colorado, Permit Number M-74-004. The structural geology <br />evaluation presented herein includes observations and measurements from the quarry <br />that have been obtained annually by LF&A staff over the past eleven years (1997-2007) <br />as well as results of the detailed geotechnical investigation conducted by LF&A in 2003. <br />The main purpose of the annual evaluation is to monitor the impact the bedrock <br />structural geology has on pit wall stability as mining progresses. The data collected for <br />this report were performed on a quarterly basis to ensure adequate exposures were <br />measured. Observations and structural analyses of data were conducted by LF&A <br />geologists and engineers, and are applicable to the quarry at the time the data were <br />obtained (June 2007 through January 2008). <br />More specifically, the goals of this study are as follows: <br />• Document geologic discontinuities by mapping and taking photographs along each <br />recently exposed quarry wall to utilize the data in validating and updating the existing <br />structural geology database; <br />• Analyze the new data relative to the existing data in order to verify and/or modify <br />existing conclusions, and to investigate possible emerging trends; <br />• Review and characterize the existing stability conditions at the quarry relative to the <br />current long-term mine plan; <br />• Locate and document changes in groundwater conditions; <br />• Locate and document any obvious slope instabilities. <br />- 1 -