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TRAPPER MINING INC. January 11, 2007 CERTIFIED ~~` ~q ~~~`~~ °'6jsia ~2,9? Ms. Carla I.enkey Mq~n ofq ~~I Colorado Department of Public Health and Environment 9a4aSJ''~ari WQCD-PE-B2 dray °n 4300 Cherry Creek Dr. South Denver, CO 80222-1530 Subject: Fourth Quarter 2006 Colorado Wastewater Discbarge Monitoriug Reports Permit No. CO-0032115 Dear Ms. l,enkey: Enclosed are Trapper Mine's Fourth Quarter 2006 Colorado Wastewater Discharge Monitoring Reports for the period 10/1/06-12/31/06. During this quarter, five NPDES outfalls were active. Outfalls 001, 002 and 020 discharged routinely throughout the quarter. Outfalls 011 and 021 discharged in response to fall precipitation events. Outfalls 005, 008, 009, 012, 013, 014, 015, 016, 017, 018, 019, 022, 023 and 024 did not discharge during the quarter. Values reported on the enclosed DMRs represent the maximum (or minimum as applicable) monthly/daily values generated at each outfall during [he quarter. Also enclosed are monthly NOAA weather summaries for the reporting period and WET test report forms as applicable. Three outfalls were sampled for WET analyses during the quarter. Two species acute tests were completed at outfalls Ol 1, 021 and 022. No exceedances of WET test limitations were observed at any tested outfalls. The Craig area experience a fairly wet late summer and fall. The heavy precipitation caused many of the ~~ sediment control pods to fill with water, thus reducing starage capacity for excess water. :;^,ao*~,~-,r 1;;t° the site received 0.33 inches of precipitation and 0.81 inches combined in the previous five days. This was a great deal of precipitation for already swollen ponds to accept from a 2.34 inch event in mid September. The enclosed NOAA weather summary reports show the daily precipitation measurements, of which are recorded at 7:30 a.m. as well as daily maximum and minimtun temperatures from the previous 24 hotus. Primary effluent limitations were exceeded on outfalls 011 for TSS. Outfalls 001, 002, 020 and 021 remained in compliance throughout the quarter. The alternate limitations will be applied to ou[fall 011 due to the precipitation event the previous day. Samples were taken at each outfall on October 10, 2006 during routine weekly monitoring. No exccedances of primary effluent limitations for pH occurred during [he quarter. Trapper is required to maintain sediment levels in ponds at or below 60% of the pond volume. All outfalls have been properly maintained and no ponds exceeded the 60% threshold for sediment accumulation. All stmctttres operated properly and were not compromised in any way. The exceedance occurred solely in response to discharge caused by precipitation and/or snowmelt, therefore the alternative limitations are applicable for this event. All other operations were properly conducted concerning the sediment control structures at Trapper Mine. P.O. Box 187 Craig, Colorado 81626 (970) 824-4401