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COLORADO DEPARTMENT OF HEALTH <br />Water Quality Control Division <br />4210 East 11th Avenue <br />Denver, Colorado 80220 <br />Page 2 of 3 <br />Permit No. COC-850017 <br />VI. DISCUSSION: <br />Applicable effluent limitations and monitoring requirements regarding <br />active mining out£alls and post-mining outfalls, are addressed in Part <br />I.B.1(a) and (b) respectively of the general permit. <br />Total dissolved solids monitoring of the discharge shall be performed. <br />Total phosphorus monitoring shall not be performed. See page 3 of the <br />general permit for more information. <br />The Permittee will be required co develop and implement a Storm Water <br />Management Plan (SWMP). Although some activities may already be in place, <br />the SWMP will require the Permittee to coordinate best management <br />practices so the result is a reduction or elimination of pollutants <br />reaching state water from areas not limited by effluent limitations. The <br />Permittee will be required co submit the SWMP to the Division for review <br />within six months from the date certification is issued. For specifics of <br />the Plan and additional requirements, please reference the Part I.B.2 of <br />the general permit. <br />The permittee will not be required to perform Whole Effluent Toxicity <br />(WET) testing pursuant to Section 6.9.7(2)(a)(i)(A) of the Regulations for <br />the State Discharge Permit System 6.1.0 (5 CCR 1002-2) which exempts <br />facilities certified under the general permit. <br />VII. SPECIFIC INFORMATION OF CONCERN TO THE PERMITTEE: <br />The Permittee is encouraged to read the general rationale for an <br />understanding of how the general permit was developed and to read the <br />permit itself to see what requirements exist. Effluent limitations and <br />monitoring requirements are specified in Part I.B, and special <br />notification requirements for effluent violations are addressed in Part <br />II.A.3. <br />Based on the above information, the Colowyo Coal Company is certified to <br />discharge from the Colowyo Mine under the general permit for coal mining <br />facilities, identified as Permit No. COG-850000. All correspondence <br />relative co this facility should reference the specific facility Permit <br />No. COG-4:0017. <br />Completed By: Bruce~Cenc (Science Applications International Corporation) <br />6/3/92 <br />Reviewed By: Patricia Nelson (Colorado Deoartmenc of 9ealth) <br />5/9/92 <br />