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Martin Marietta Materials <br />Spec -Agg Project <br />1.0 INTRODUCTION <br />STRUCTURAL GEOLOGY EVALUATION <br />SPECIFICATION AGGREGATES QUARRY <br />2012 ANNUAL REPORT <br />Lachel & Associates, Inc. (Lachel), Lakewood, Colorado has prepared this independent annual structural <br />geology evaluation for the Specification Aggregates (Spec -Agg) Quarry located in Golden, Colorado (Figure <br />1) for the 2012 year. This study was conducted at the request of Martin Marietta Materials, Inc. (Martin <br />Marietta), the owner of the quarry, as a requirement for State of Colorado, Permit Number M -74 -004. The <br />structural geology evaluation presented herein includes observations and measurements from the quarry <br />that have been obtained annually by Lachel staff over the past fifteen years (1997 -2011) as well as results of <br />the detailed geotechnical investigation conducted by Lachel in 2003. <br />The main purpose of the annual evaluation is to monitor the impact the bedrock structural geology has on pit <br />wall stability as mining progresses. The data collected for this report was obtained over several visits to <br />ensure adequate exposures were observed. Updates to the structural analyses of data were conducted by <br />Lachel geologists and engineers, and are applicable to the quarry at the time the data was obtained (August <br />2011 through January 2012). <br />More specifically, the goals of this study are as follows: <br />• Inspect the recent exposures at the quarry for stability and variation in discontinuities and foliation <br />planes. <br />• Document the geologic discontinuities by mapping where warranted and taking photographs along <br />recently exposed quarry walls to utilize the data in validating and updating the existing structural geology <br />database. <br />• Analyze the new data relative to the existing data in order to verify and /or modify existing conclusions <br />and to investigate possible emerging trends. <br />• Review and characterize the existing stability conditions at the quarry relative to the current long -term <br />mine plan. <br />• Locate and document changes in groundwater conditions. <br />• Locate and document any obvious slope instabilities. <br />February 13, 2012 <br />Project 11361017.00 <br />Page 1 <br />Lachel & Associates, Inc. <br />©2012 All Rights Reserved <br />