2007-07-19_REVISION - M1977208 - Laserfiche WebLink

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D~cmcx~ Mr. Carl Mount ~s~ ~~ i~fdfi ~~'~t~~® ~~ 1 ~ Z00T Division at cteclanlation, Mining and Safety Senior Environmental Protection Specialist Division of Reclamation, Mining and Safety 1313 Sherman Street, Room 215 Denver, Colorado 80203 July 17, 2007 via cec[ified mai1 7004 2890 0003 2043 0628 Re: Lyons Quarry, Permit No. M-1977-208, C-Pit TR-8/TR-9 Schedule Extens Re~c uest Dear Mr. Mount: CEMEX requests an extension of the schedule proposed for reporting on the results of the C-Pit Hydrogeo]ogic Investigation (TR-8), and an extension of the submittal date for the long-term monitoring plan to be submitted as TR-9. CEMEX's March 30, 2007 plan for the TR-8 hydrogeologic investigation of C-Pit assumed flow gauging of the Boulder Feeder Canal could be accomplished by mid-May, in time to support reporting to DRMS by early July. In our May 8, 2007 response to the April 23, 2007 DRMS adequacy review letter, we committed to submitting along-term monitoring plan as TR-9 by August I, 2007, based upon the results of the TR-8 investigation. CEMEX now proposes to submit the results of our hydrogeologic investigation and our proposed long-term monitoring plan by August 31, 2007. The task of gauging the Boulder Feeder Canal flow in the reach adjacent to C-Pit (to quantify any measurable leakage that may be affecting C-Pit) has yet to be accomplished. Our consultant Brown and Caldwell has been in regular contact with the Northern Colorado Water Conservancy District, and has been informed that consistently significant flow rates in the Canal have been delayed this year due to above average precipitation this spring and early summer. Flow in the Canal, which is designed to flow at 200 CFS, was in the single-digit cubic feet per second (CFS) range up until late June. In the last ten days it has risen to levels consistently over 100 CFS, and therefore the present plan is to gauge the canal in the next two weeks. Most of the proposed scope of work in the March 30, 2007 plan for TR-8 has been accomplished: Lyons Plant P0. Box 529, Lyons, CO 80540. USA, (303) 823-2100, fax (303) 832-2199