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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 />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 />