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August 11, 2015 <br />Mr. Tyler O'Donnell <br />Colorado Division of Reclamation, Mining and Safety <br />Department of Natural Resources <br />1313 Sherman Street Room 215 <br />Denver, CO 80203 <br />OGCC <br />Rio Grande <br />RECEIVED <br />AUG 12 2015 <br />DIVISION OF RECLAMATION <br />MINING AND SAFETY <br />RE. Technical Revision to Mining Permit No. M-2002-004 <br />Response to Questions Dated June 2015 - Proposed Beneficial Re -Use of a Portion of Kiln Peed Material from <br />the Main Kiln Baghouse in QuarryArea for Reclamation Backfill Purposes <br />GCC Rio Grande, Inc. — Pueblo Cement Plant and Limestone Quarry <br />Dear Mr. O'Donnell: <br />GCC Rio Grande, Inc. (GCC) has prepared the enclosed response to questions from the Colorado Division of <br />Reclamation Mining and Safety (DBMS) dated May 27, 2015 regarding Technical Revision (TR) -05 request <br />submitted to DRMS on April 21, 2015. At the request of DRMS, GCC performed additional analyses of the kiln <br />feed material from the main kiln baghouse using the Multiple Extraction Procedure Method 1320. The samples <br />and analyses were recently conducted using Method 1320 as a supplement to the Toxicity Characteristic <br />Leaching Procedure (TCLP) tests conducted on the kiln feed material in January 2015. Both the TCLP and <br />Method 1320 test results demonstrate kiln feed material from the main kiln baghouse exhibits properties that <br />will not present an impact when beneficially used in quarry for reclamation backfill purposes. The results of the <br />analyses can be found in Attachment A. <br />In addition to the analyses, GCC has prepared a response to the questions asked by DRMS to provide additional <br />information on the Portland cement manufacturing process, placement of a portion of the kiln feed material <br />from the main kiln feed baghouse into the quarry, and its beneficial use in reclamation. <br />If you have any questions regarding the contents of this TR, please feel free to contact me at (303) 739-5908. <br />Sincerely, <br />441e <br />Nancy Garnett <br />Corporate Environmental Manager <br />GCC America <br />cc: Gina Nance, Plant Manager, GCC <br />Tony Waldron, DRMS <br />