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<br /> <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br /> <br /> <br />1313 Sherman Street, Room 215, Denver, CO 80203 P 303.866.3567 F 303.832.8106 http://mining.state.co.us <br />John W. Hickenlooper, Governor | Mike King, Executive Director | Virginia Brannon, Director <br />February 25, 2015 <br /> <br />Mr. Joe Lamanna <br />Holcim (US) Inc. <br />3500 Highway 120 <br />Florence, CO 81226 <br /> <br /> <br />Re: Portland Limestone Quarry, Permit No. M-1977-344; <br /> Technical Revision Approval, Revision No. TR-10 <br /> <br />Dear Mr. Lamanna: <br /> <br />On February 25, 2015 the Division of Reclamation, Mining and Safety approved the Technical <br />Revision application submitted to the Division on October 20, 2014, addressing the following: <br /> <br /> Proposal to remove sodium as groundwater quality parameter and replace with a K:Na ratio <br />using 0.5 as a numeric protection limit. <br /> <br />The terms of the Technical Revision No. 10 approved by the Division are hereby incorporated into <br />Permit No. M-1977-344. All other conditions and requirements of Permit No. M-1977-344 remain <br />in full force and effect. <br /> <br />The Division has reviewed this change for impacts to the financial warranty and has determined that <br />this change does not require an increase to the current reclamation liability. <br /> <br />If you have any questions or need further information, please contact me at (303)866-3567 x8169. <br /> <br />Sincerely, <br /> <br /> <br /> <br />Timothy A. Cazier, P.E. <br />Environmental Protection Specialist <br /> <br />ec: Tom Kaldenbach, DRMS <br /> Amy Eschberger, DRMS <br /> DRMS file <br /> Chris Peters, ARCADIS