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<br />C c~~eus <br />"`'~ Yampa Valley <br />Cyprus Yampa Valley Coal Corporation <br />29587 Routt County Road #27 <br />Oak Creek, Colorado 80467 <br />303-879-3800 <br />January 31, 1994 <br />U.S. Environmental Protection Agency, Region VIII <br />Attention: Permits and Enforcement <br />999 - 18th Street 8WM-C <br />Denver Place -Suite 500 <br />Denver, CO 80202-2405 <br />To Whom It May Concern: <br />ter..-1`I` <br />r~~ J `~;,~-l <br />~ ~ `~ <br />L,1 <br />Re: Discharge Monitoring Reports NPDES Permit CO-0027154 <br />Enclosed, please find the materials pertaining to the above-referenced DMRs for <br />DECEMBER of 1993. Only outfalls 001, 005, and 006 showed discharge during the <br />period in question. Outfalls 002, 003, 004, 007, 008, 009, 010, 016, and 017 <br />showed NO DISCHARGE. No exceedences were noted for the period, with the <br />exception of the report for Chronic WET testing for outfall 007 (due to no sample <br />collection as a result of no flow in Decemberl. As previously relayed to the <br />Department, the outfall in question discharged during a short period in November, at <br />which time an Acute sample was collected. It was anticipated that the required <br />Chronic sample could be collected in December once the Site 109 discharge was <br />routed fully to site 1 14, at which time it was anticipated that some overflow from the <br />109 discharge would be shunted into outfall 007 and result in flow. This routing took <br />place in early December, but the volumes discharged via site 109 to site 114 did not <br />result in any overflow to the pond, and as such the chronic sample could not be <br />collected. Due to the short timeframe associated with the November discharge, and <br />the collection of an Acute sample during that episode, we do not feel that it would <br />have been possible to collect a chronic sample at that time. CYVCC has modified the <br />sampling schedules associated with this outfall to address possible intermittent <br />discharges in the future, and the associated WET testing sample collections required. <br />Sincerely, <br />Marcus A. Middleton <br />Environmental Specialist <br />Enclosures <br />cc: K. Gorham; Colorado Mined Land Reclamation Division <br />