2009-10-23_REVISION - M1977208 - Laserfiche WebLink

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DRMS CEMEX M1977-208 Quarterly Report Y09Q02 10/20/2009 Page 2/4 CEMEX continues to monitor the water elevation in the C-Pit pond visually; the data logger recording head data became submerged under slumping shale and clay and was removed from the pit in June 2009. The kiln, and hence the cooling water tower, has been shut down from December 2008 to April 24, 2009, June 28 to August 10, and again from September 7 to October 7, 2009. Pumping occurred intermittently for cooling water between April 2009 and October 7, 2009. Re-evaluation of water levels in the third quarter of 2009 revealed that the level rose approximately three feet over the two quarters. Albiet this limited pumping, ditch leakage, and the extremely wet season, CEMEX has reduced the water surface area remaining in C-Pit down to approximately a quarter acre. There has been in-flow of water through the west high wall in C-Pit in this quarter. Water was present in some of the pieziometers placed between the canal and C-Pit, but none was present between the Sweede Ditch and the pit. Based on these and other observations, it is evident the majority of the source of the water into the C-Pit is from the loss of lining at the northern bend in the irrigation ditch. We will begin to explore options in this non-irrigation season to work with Northern Colorado to reline this portion of the ditch. Lower portions of the ditch were lined in prior seasons. No seeps or springs down gradient of C-Pit have been observed. As agreed upon in TR-9, we will continue to monitor for the presence of seeps or springs. CEMEX appreciates the opportunity to meet with the Division on October 14 and review the goals of this monitoring program in order to establish the most prudent course of actions. Pursuant to that meeting, CEMEX will submit a TR11 to address short term monitoring changes, and TR12 by the end of the first quarter of 2010 to summarize the information and data collected to date and develop a long term groundwater protection and monitoring program which will include the results of discussions with Northern Colorado and closure of CEM005. If there are any questions on the above information or the attachments, please contact me at (303) 823-2115. Sincerely, _*NuGC,6t/ '&046? Monica Sowders Environmental Manager 5134 Ute Hwy PO Box 529 Lyon, CO 80540 Encl.\ Analytical Laboratory Reports, Environmental Sciences Corporation Cc: (via email) Alan Notary, Brown & Caldwell United States Operations P 0 Box 529, Lyons, CO 80540, USA, Phone (303) 823-2100, Fax (303) 823-2199