2010-02-02_HYDROLOGY - M1977208 - Laserfiche WebLink

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DRMS CEMEX M1977-208 Quarterly Report Y09Q02 2/1/2010 Page 2/3 quarters. Even with limited pumping, ditch leakage, and another high precipitation fall and early winter, CEMEX has continued to manage the water surface area remaining in C-Pit to approximately one quarter acre. Additional "wet spots" due to precipitation less than %2 foot exist. In-flow of water through the west high wall in C-Pit has not been observed during the fourth quarter of 2009. Water continues to be present in some of the pieziometers placed between the canal and C-Pit, but was absent in those located between the Sweede Ditch and the pit. After the lining of approximately 1200 lineal feet of the Northern Colorado Water Conservancy District (NCWCD) supply ditch in 2008, the reduction in the amount of water inflow to C-Pit from the western pit was very pronounced. Based on these and other observations, it is evident the majority of the source of the remaining water entering into C-Pit is from the loss of bank lining at the northern bend in the NCWCD supply ditch. We have informally contacted NCWCD management to request that the lining of the northern bend would be beneficial to our water gain versus their water losses. At this time, we have been informed that they do not have 2010 dollars budgeted for ditch lining. However, we will continue to attempt to work with them to look at what alternatives we may come up with to attempt to reline this portion of the ditch. Continued monitoring and observations indicate that n additional seeps or springs down gradient of C-Pit are occurring. As agreed upon in TR-9, we will continue to monitor for the presence of seeps or spnngs. CEMEX appreciates the input and cooperation we have received from working with the DRMS, and looks forward to our continued cooperation as we go forward. A TR12 will be submitted to the DRMS by the end of the first quarter of 2010 to summarize additional information and data collected to date and develop a long term groundwater protection and monitoring program which will include the results of discussions with NCWCD and closure of CEM005. If there are any questions regarding the above information or the attachments, please contact me at (303) 823- 2115. Sincerely, I *1U161__1&Wd61W_1 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