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CDPS EXCEEDANCE REPORT <br />Mine Site: COLOWYO MINE <br />Outfall No.: 001 <br />Sample Taken by: Env. EnQ. - Tony Tennvson <br />Exceedences: Total Suspended Solids - 68 mpJL <br />Pernut No.: COG-600751 <br />Sample Date: 12/28/2006 <br />Laboratory Sample ID: L60513-01 <br />Report Prepared by: Kurtis Blunt <br />Explanation: <br />A sample was taken on December 28, 2006 from Outfa11001. Water from this sample represented <br />the final remaining accumulation of stormwater collected in the bottom of the West Pit, As a result, <br />the quality of water filtered was extremely poor. This over-whelmed the ability of the filters to <br />adequately remove enough of the small suspended particles to meet the TSS requirements. When <br />taken the discharge water appeared to be of good quality and did not indicate any problems would be <br />expected with regards to effluent requirements. There was not any visible discoloration of the sample <br />and no visible signs of particulates. Colowyo believed in good faith that the filtration equipment was <br />rated and adequate to filter the quality of water present in the pit at that time. Discharge was ceased <br />the morning of December 29, 2006 due to insufficient water available for pumping and filtering. <br />Should additional water accumulate in the West Pit pumping will be resumed in the future. A letter <br />has been submitted to request changing the status of this 90-day permit to long term status. <br />Identify Support Info: <br />Relevant laboratory data from Outfa11001 <br />Proposed Action: <br />Stormwater avenues into the bottom of the West Pit are being re-evaluated and will be modified as <br />necessary to minimize sediment loading from the West Pit. Colowyo will evaluate the potential <br />benefits and practical application of flocculating agents in the future. If there is any indication that <br />chemical treatment of stonnwater prior to pumping and filtering provides a substantial benefit, <br />Colowyo will submit further information for your review and approval. <br />Colowyo will not attempt to pump and filter water that exhibits the characteristics of the water that <br />led to this exceed nce in the future. As a result, Colowyo will manage extremely poor quality water <br />within the bo aries the est Pit. <br />Name: <br />Date of Submittal: <br />N:\CCC_P[SHQ~2L0 NQC D\21.1 CUPS Permit\^_1.1.21nspectione & Report\2006:CDP5 Excecdanec Rcport_oQl doe <br />