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K. Sullivan DMR First Quarter 1996, COG850017 April 24, 1996 Page 2 February The ambient temperature increased during the first couple of weeks in February causing significant snowmelt to occur. In addition to the snowmelt, outfalls 001 A, 002A, 004A, and 006A were receiving inflow from rainfall events beginning on February 17 and proceeding through February 22. The combination of rain on top of snow caused a large volume of runoff to enter the ponds. Colowyo is claiming the Alternate Limitations parameters apply under the Active Muting Outfall(s) for a less than or equal to the 10-year, 24- hour precipitation event (or snowmelt of equivalent volume). Claiming the Alternate Limitations, the total iron and total suspended solids discharge limitations drop out and only pH, visible oil and grease and settleable solids parameters apply. Colowyo has included rainfall data to meet the Burden of Proof Requirement in Part I, B, 1, d of the current CDPS permit, Outfitll OOlA -February 15, 1996 Colowyo personnel diswvered the Streeter Pond was discharging through the primary riser pipe. February 22 the manual dewatering system was opened to allow additional waters be discharged from the pond thus ensuring pond integrity, consistent with the October 3, 1994 wrrespondance received from Patricia Nelson of the WQCD. Initial samples were collected on February 22 and again on February 29. The manual dewatering system was closed after sampling on February 29. Outfall 004A -February 20, 1996 there was approximately 1" of freeboard between the top of the primary j riser pipe and the surface of the pond. February 22 water was discharging through the primary riser pipe and the manual dewatering system was opened to allow additional water to be discharged from the pond thus ensuring pond integrity. Outfall 006A -February 14, 1996 the Gossard Loop Pond (also known as the Rail Loop Pond) was full. February 15 the manual dewatering system was opened to ensure water in the pond did not dischazge over the emergency spillway. Outfall 002A -February 16 the manual dewatering system was opened to allow water to be discharged from the pond thus ensuring pond integrity. March Outfall 001 A - A leaking head gate at this outfall caused sampling of the discharge to continue throughout the month of March. The head gate had been closed on February 29 and the pond was not receiving inflow. March 5 field parameters were collected from the discharge and samples were collected on March 12, 18, and 25 and sent to a certified laboratory for chemical analysis. The head gate continues to leak but at the reduced rate of approximately 0.5 to 1 gallon per minute. Outfall Ol OA -March 5 Colowyo personnel discovered the East Taylor Pond was discharging through the primary riser pipe. March 5 the manual dewatering system was opened to allow additional waters be discharged from the pond thus ensuring pond integrity. The head gate was closed on Mazch 6 prior to sampling. March 18 the manual dewatering system was opened long enough to allow for the collection of ~t a sample of the same waters which were discharged March 5 through 6. The head gate has not been opened ,.