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}. <br />~Holcim <br />May 10, 2001 <br />Division of Minerals and Geology <br />Department of Natural Resources <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />Attention: Mr. Larry Oehler <br />Holcim (US) Inc. Phone 719 784 6325 <br />3500 Highway 120 Faz 719 784 3470 <br />Florence, CO 81226 www.holcim.com/us <br />Subject: Permit No. M-77-344, Technical Revision No. 06, Adequacy Review Response <br />Holnam, Inc. Quarry, Portland, Colorado <br />Dear Mr. Oehler: <br />The purpose of this letter is to respond to the adequacy items included in your letter dated January 18, 2000 <br />(Attachment 1). The numbered responses correspond to the list of items attached to your letter. A brief <br />summary of the action requested under each item is given in italics followed by our response. Many of the <br />items listed will be addressed in an application for a permit amendment, which will be submitted in the <br />near future. Those items are identified accordingly in the following paragraphs. <br />Item No. 1 <br />All cement kiln dust (CKD) handling areas need to be brought into the permit area. <br />This item will be addressed in the permit amendment application to be submitted in the near future. <br />Item No. 2 <br />Please provide an estimate of the volume of CKD that will be generated from processing the remaining <br />limestone in the permit area and an estimate of the volume of CKD that the existing and proposed disposal <br />areas will accommodate. <br />it is estimated that when the new dry kiln is brought online Holnam will generate approximately 95,000 to <br />110,000 metric tons per year (mtpy) of CKD. Given the expected life of the mine currently estimated to be <br />approximately 40-50 years, the total amount of CKD generated would be on the order of 6.4 to 8.5 million <br />metric tons (mmts). The area currently designated for CKD disposal is indicated on Figure 2 and has an <br />estimated capacity of approximately 5 years. Holnam will be evaluating alternative disposal areas within <br />the portion of the permit area, to be mined in the future, prior to completing the filling of the currently <br />designated CKD disposal area. The areas selected for future disposal of CKD will be in locations where <br />the CKD is above the water table in the underlying Codell Sandstone and will not be adjacent to any <br />undisturbed areas where groundwater could potentially migrate laterally into the CKD. <br />Strength. Performance. Passion. <br />