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DNR , COLORADO <br /> CO Division of Reclamation, <br /> ..' Mining and Safety <br /> Depa tnten`o'Natuna Resources <br /> 1313 Sherman Street, Room 215 <br /> Denver, CO 80203 <br /> February 25,2015 <br /> Mr.Joe Lamanna <br /> Holcim(US)Inc. <br /> 3500 Highway 120 <br /> Florence,CO 81226 <br /> Re: Portland Limestone Quarry,Permit No.M-1977-344; <br /> Technical Revision Approval,Revision No.TR-10 <br /> Dear Mr. Lamanna: <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 /> 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 /> 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 /> 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 /> If you have any questions or need further information,please contact me at(303)866-3567 x8169. <br /> Sincerely, <br /> .,, ,,,,---A.3- C..___.:, <br /> TimothY A. Cazier,P.E. <br /> Environmental Protection Specialist <br /> ec: Tom Kaldenbach, DRMS <br /> Amy Eschberger, DRMS <br /> DRMS file <br /> Chris Peters, ARCADIS <br /> /o co4� <br /> ,e(�L�\9; <br /> 1313 Sherman Street, Room 215, Denver,CO 80203 P 303.866.3567 F 303.832.8106 http://mining.state.co.us I *\• */ <br /> John W. Hickenlooper,Governor I Mike King, Executive Director I Virginia Brannon, Director \'\,�s */ <br />