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Martin Marietta Materials <br /> Spec-Agg 2016 Annual Report <br /> 1.0 INTRODUCTION <br /> Lachel &Associates, Inc. (Lachel), has prepared this independent annual structural geology evaluation <br /> for the Specification Aggregates (Spec-Agg) Quarry located in Golden, Colorado for the 2016 reporting <br /> year. This study was conducted at the request of Martin Marietta Materials, Inc. (Martin Marietta), the <br /> owner of the quarry, as a requirement for State of Colorado, Permit Number M-74-004. The structural <br /> geology evaluation presented herein includes observations and measurements from the quarry that have <br /> been obtained annually by Lachel staff over the past nineteen years (1997-2015), as well as results of the <br /> detailed geotechnical investigation conducted by Lachel in 2003. <br /> 2.0 PURPOSE AND SCOPE OF WORK <br /> The purpose of the annual evaluation is to monitor the influence the bedrock structural geology has on pit <br /> wall stability as mining progresses. The data collected during this annual assessment was obtained <br /> during site visits in July and December 2015, respectively. <br /> The scope of this study is as follows: <br /> ■ Observe recent rock mass exposures for large-scale instability and collect geologic rock structure data. <br /> ■ Document the orientation and character of rock mass discontinuities(e.g.joints,foliations,faults)where <br /> recent exposures are accessible to supplement the existing structural geology database. <br /> ■ Document groundwater observations at mapped locations. <br /> ■ Photograph significant findings at the mapped rock mass exposures. <br /> ■ Compare the new rock structure data collected during site visits in 2015 with the previously collected <br /> data to identify potential changes to the previously analyzed discontinuity sets and possible new sets <br /> that may need to be considered for the mine highwall structural discontinuity analysis. <br /> ■ Based on the new rock structure data, update the rock structural discontinuity analyses for the final <br /> mine highwall slopes. <br /> ■ Summarize the field observations, mapping data, and structural discontinuity analyses results in an <br /> annual report. <br /> February 8, 2016 Page 1 Lachel & Associates, Inc. <br /> Project 15364004.00 ©2016 All Rights Reserved <br />