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CDPS EXCEEDANCE REPORT <br />Mine Site: COLOWYO MINE <br />Outfall No.: 003A <br />Sample Taken by: Env. Ene• _ Tony Tennyson <br />Permit No.: CO-00045161 <br />Sample Date: 08/10/2006 <br />Laboratory Sample ID: S0608248-001 <br />Exceedences: Total Suspended Solids - 156 mg/L, Report Prepared by: Kurtis Blunt <br />Explanation: <br />Precipitation records indicate that there were multiple rainfall events at Colowyo in the days <br />leading up to the August 10, 2006 sampling date. The sample was taken on August 10, no rainfall <br />events were observed on this date. The storm patterns on the days prior to the August 10 sample <br />suggest short duration high intensity rainfall events (thunderstorms) caused multiple inflows into the <br />pond from the surrounding designed ditches. Discharge from the pond began as a result of the series <br />of storms that passed through the area during the days prior to the August 10 sampling. Precipitation <br />was measured on the evening of August 8, 2006, and sampling was performed at 11:15 am on August <br />10, 2006, thus qualifying for consideration of the use of Alternative Effluent Criteria for this sample. <br />Identify Support Info: <br />Relevant laboratory data from Outfa11003A <br />Colowyo Mine -Ambient Air Network: 3'rd Qtr. 2006 Precipitation & Temperature Data <br />Proposed Action: <br />Flocculation chemicals approved in the CDPS permit will be added to the pond waters in order to <br />reduce the TSS concentration of the waters that could potentially be discharged from the pond to <br />below the MCL of 35 mg/L in the future. Colowyo is also working with representatives from GE <br />Betz to identify flocculation chemicals and treatment options in order to prevent future TSS MCL <br />exceedences. <br />Stormwater avenues into the pond are being re-evaluated and will be modified as necessary to <br />minimize sedimentation caused by runoff originating from disturbed areas. <br />Sediment cleanout of his and was completed during October, 2006. <br />Name: ~~ <br />Date of Submittal:-~ ~~~;7//// <br />h_Cl: C_H51 f)'21P wQC'D'~21.1 C'DPti PcnniO^_1.1.2 Hugeaions& Rr~rL.'?Oi)e1l'UPi 8sca~Jance Rzunn_Of3A_dnc <br />