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~~~~"~~~~® dl~a 1 ~ w1 <br />®,CR1C-X ~ P?AR 2 8 2007 <br />David Bird ~ u'~,t 3/25/2007 <br />Division of Reclamation, Mining and Safety via Certified Mail <br />Department of Natural Resources Return Receipt Requested <br />1313 Sherman St., Room 215 Tracking #:7004 2890 0003 2049 6549 <br />Denver, Colorado 80203 <br />RE: C~MEX, Inc., Lyons Quarry, Permit No. M-1977-208 <br />ert Materials Disposal on C-Pit <br />Dear David Bird: <br />To address the Division's concerns about the water elevation in C-Pit, CEMEX will comply with all your <br />requests stated in your 2/26/2007 letter. <br />We will monitor the presence of water in the pit and keep fill below levels where existing ponded water <br />could migrate into the surrounding unconsolidated material. We will also perform daily visual <br />inspections of the property to determine if any springs or seeps develop. If springs or seeps are noted, we <br />will cease backfilling and notify the Division within two working days. <br />Ninety percent (90%) of the material will be between five inches to one-fourth inch width - a range which <br />is typical of spoil material gradation. This is in order to comply with the standards of Rule 3.1.5(9)(f), as <br />well as ensure that material will be placed and stabilized in a manner that will avoid unacceptable settling <br />and voids <br />In addition, we will perform the following measures: <br />o Ensure that impact to groundwater is minimized and/or address installation of monitoring wells in <br />the alluvial formation (to either demonstrate no connectivity to the alluvium or identify <br />appropriate monitoring size); <br />o Further evaluate the source and migration of water into [he C-Pit and develop plans to <br />minimize/eliminate the sources of water migration; <br />o Provide a new cement kiln dust (CKD) disposal plan that eliminates contact with water in the C- <br />pit; and <br />o Evaluate a new CKD disposal plan that eliminates dust suppression that will be submitted at a <br />later date due to coordination efforts with the CDPI-IE. <br />If there are any questions, or you require additional information, please, do not hesitate to contact me at <br />(303) 823-2115. <br />Sere X~~ <br />Monica Sowders <br />Environmental Manager <br />cc: Cazl Mount, DRMS <br />David Bird, DRMS <br />AI Notary, Brown and Caldwell <br />Paul Banks, Banks & Gesso <br />Mike Figgs, LREP, Inc. <br /> <br />Lyons Plant <br />P.O.Box529,Lyons,CO 80540.USA,(303)823-2100, Fax (303)832-2199 <br />