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1XN. c_MG>4 <br />May 13, 2015 <br />Michael Cunningham <br />Division of Reclamation Mining & Safety <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />RE: Bond Increase CEMEX/New Equipment <br />DRMS File Number- M-1977-208 <br />Technical Revision TR -13 <br />Dear Mr. Cunningham; <br />REr�lie <br />.�E D <br />MAY 15 2015 <br />Via FEDEX <br />TRK 7736 0272 4309 <br />CEMEX Construction Materials South, LLC would like to initiate a Technical Revision (TR -13) <br />in order to facilitate the Division's review of the proper bond amount associated with <br />several plant environmental systems being installed. <br />CEM EX, in order to comply with NESHAP LLL 40 CFR §63.6(i) will need to install an Activated <br />Carbon Injection (ACI) System to reduce mercury emissions from the kiln flue gas as well as a <br />Lime Injection System (LIS) designed to allow for an alternative monitoring for HCI <br />emissions. The ACI and LSI will operate as dry bulk feed systems consisting of two silos and <br />pump building for the lime. The ACI and LIS will deliver powder directly into effluent gas <br />streams of the kiln. <br />In addition, CEMEX agreed to install Selective Non -catalytic Reduction (SNCR). in order to <br />comply with U.S.EPA Consent Decree No. 09-cv-00019-MSK-MEH. The SNCR system is <br />designed to control NOx emissions by injecting aqua ammonia directly into kiln Pre -Heat <br />Tower. SNCR consists of a 35,000 gallon aboveground storage tank with secondary <br />containment and fencing, associated aboveground piping to deliver aqua ammonia and <br />water lines to deliver tempered water to i emergency eye wash stations, as well as a skid <br />tank that pumps the water ammonia into the kiln flue gas. <br />Attached are construction site drawings for SNCR, Lime Injection Silo and associated pump <br />building, and the Activated Carbon silo. <br />✓��d�o/� <br />No vtolQJrah,s <br />