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(// U ~1--~ ~, ~.,_ ~:' E~~.4 s coa~compam Seneca Coal Company January 23, 2007 RF~E~~~D t V Colorado Department of Health ~iviSi - j 4400 CheBry Creek Drive South M~°t°9a~USaery~Op Denver, CO 80246-1530 RE: Quarterly Discharge Monitoring Report for Permit CO-0000221 Dear Sir or Madam: Pursuant to the quarterly reporting requirements contained in Colorado Discharge Permit CO-0000221 for the Seneca Mine Complex, enclosed find the fourth quarter 2006 discharge monitoring reports for Sites 002 to 006 and 008 to 017. In this quarter, no discharges were observed at Points 005, 009, 011, and 014. Intermittent flows were observed at Point 013. Vehicle access to Points 004, 005, 008, 009, 010, 015, 016 and 017 this quarter was intermittent due to muddy or snowpacked roads. Monthly visits were performed by snowmobile or snowshoe. Seneca was issued a new CDPS permit effective November 1, 2006. As this date fell within the middle of a calendar quarter, it presented a problem as to which sets of DMR`s to use (i.e., the DMR's issued under the old permit or the new permit). After consulting with Andrew Nuehart and Leslie Simpson of the WQCD, it was decided that, if a parameter was common to both the new and old permits, then all data for that parameter collected in the fourth quarter would be reported on the new DMR's (with a `from' date of 06-11-01) If a parameter was only required under the old permit (total iron, suspended solids and WET testing at some outfalls), that data would be reported on the old DMR's (with a `from' date of 06-10-01) In cases where an old DMR was used, the words "old DMR" or "old permit" were written in red ink on the upper right corner of the DMR. The new CPDS permit contains outfalls with MN prefixes for quarterly trace metal monitoring and wT prefixes for chronic WET tests. Part I.C.10. (pg. 24) of the permit states: Seneca Coal Company • P.O. Box 670 • Hayden, Colorado 81639 Telephone (970) 276-3707 • FAX (970) 276-3014