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Colowyo Coal Company, L. P. 5731 Srate Highway 13 Meeker. Colorado 81611 (970) 824 1531 (970) 8:4-1598 F.4x Kimberley A. Wolf Environmental Engineer August 31, 1999 Ms. Carla Lenkey Colorado Department of Public Health and Environment Water Qualiry Control Department 4300 Cheery Creek Drive South Denver. CO. 80222-1530 III IIIIIIIIIIIII III /~ Kenrccarr l~ .Energy , Colowyo Coal Company L.P. RECEIVED SEP p 2 1999 Division of Minerab 8 Geology RE: COLORADO WASTEWATER DISCHARGE PERMIT SYSTEM NUMBER CO-0045161 ADDITIONAL INFORMATION FOR SECOND QUARTER 1999 INDUSTRIAL DISCHARGE MONITORING REPORT Dear Ms. Lenkey, In support of the Second Quarter 1999 Industrial Discharge Monitoring Report (DMR) forwarded to the Colorado Department of Public Health and Environment, Water Quality Control Division (WQCD) and dated July 21, 1999 Colowyo respectfully submits the requested information for Outfalls OlOA, 004A, and 007A. Specifically, the WQCD requested a description of the condition of the sediment control ponds prior to the discharge events. Colowyo's sediment control ponds are designed and operated as "treatment" ponds. Theoretically each pond will carry a volume of water known as a permanent pool, below the perforation (discharge) invert. The sediment control pond associated with Outfall OlOA contained water at an elevation .5' below the perforation (discharge) invert on March 29, 1999. By April 6 the water level in the pond had risen above the perforation (discharge) invert, however there was no discharge as the pond was frozen and the discharge blocked by tumbleweeds. The perforations remained blocked during the week of April 9. During the week of April 12, while the pond was receiving inflow due to the increasing temperatures. it began to discharge and was subsequently sampled. Outfall OlOA was sampled again on April 19, 1999 and demonstrated the following analytical parameters: TSS 19 mg/1 TDS 1140 mg/l SS <0.5 mg/I Fe 1.25 mg/I Flow 0.18 MGD The sediment control pond associated with Outfall 004A contained water a[ an elevation 3' below the perforation (discharge) invert prior to [he April 26 precipitation event. This equates to approximately 2.00 acre feet of water in the pond. An inflow greater than approximately l.7 acre feet caused the pond to discharge.