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r rrrmLa chel & <br />Associates <br />A SCHNABEL ENGINEERING COMPANY <br />April 22, 2013 <br />Ms. Julie Mikulas <br />Martin Marietta Materials, Inc. <br />10170 Church Ranch Way, Suite 201 <br />Westminster, CO 80021 <br />Subject: Project 12361005, 2013 Annual Report, Structural Geology Evaluation, <br />Specification Aggregates Quarry, Golden, Colorado <br />Dear Ms. Mikulas: <br />LACHEL & ASSOCIATES, INC. (Lachel) is pleased to submit our geological engineering report for the <br />annual structural geologic evaluation for the Specification Aggregates Quarry located in Golden, <br />Colorado. This report documents the results and conclusions of our 2012 -2013 field mapping effort and <br />structural geology evaluation. This study was performed in accordance with our proposal dated <br />September 28, 2012. <br />Lachel appreciates the opportunity to work with you on this project. Please call us if you have any <br />questions regarding this report. <br />Sincerely, <br />LACHE SSOCIATES, INC. <br />/Paul H. Zehfuss, LEG <br />Project Engineering Geologist <br />r� <br />Bri K. Vn, <br />Senior Associate <br />PZ:BB:is <br />\ \gaitsvr1nt \projects \2012 \12361005 -Spec Ag QuarryMP \FINAL \FINAL 2013Spec- Agg- Report _Lachel.docx <br />lachel.com <br />T/ 303 - 279 -4321 F/ 303 - 279 -0414 <br />165 South Union Blvd., Suite 670 / Lakewood, CO / 80228 <br />