Laserfiche WebLink
immediately for pH; that value is reported instead of the value by the laboratory due to hold <br />time: <br />1. pH For CPit: March - 7.8 su, June, 2010, 8.2 su <br />2. pH for CEM004 - March - 8.0 su, June, 2010 - 7.4 su <br />CEMEX continues to monitor the water elevation in the C-Pit pond visually after the data logger <br />recording head became unusable and was removed from the pit in June 2009. C-Pit water has <br />not been used in the plant process since October 7, 2009 due to pump maintenance issues. <br />In-flow of water through the west high wall in C-Pit has been observed during the second quarter <br />of 2010. Water continues to be present in some of the pieziometers placed between the canal and <br />C-Pit, but is absent in those located between the Sweede Ditch and the pit. We are working with <br />Northern Colorado Water Conservancy District (NCWCD) to have the bend of the supply ditch <br />lined before the 2011 irrigation season. <br />Based on observations and other data, it is evident the majority of the source of the remaining <br />water entering into C-Pit is from the loss of bank lining at the northern bend in the NCWCD <br />supply ditch and stormwater runoff from the southwestern portion of the mine. We have <br />formally requested that NCWCD management line the northern bend, however at this time they <br />are not convinced there is enough beneficial reduction in water losses. <br />If there are any questions regarding the above information or the attachments, please contact me <br />at (303) 823-2115. <br />Sincerely, <br /> <br />Monica Sowders <br />Environmental Manager <br />5134 Ute Hwy PO Box 529 <br />Lyon, CO 80540 <br />Encl.\ Analytical Laboratory Reports, Environmental Sciences Corporation