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COLORADO DEPARTMENT OF PUBLIC HEALTH & ENVIRONMENT <br />Water Quality Control Division <br />WQCD P-B2 <br />Cherry Creek Drive South <br />Denver, Colorado 80246-1530 <br />RATIONALE <br />STORMWATER DISCHARGES ASSOCIATED WITH <br />METAL MINING OPERATIONS AND MINE-WASTE REMEDIATION <br />GENERAL PERMIT IN COLORADO <br />THIRD RENEWAL <br />COLORADO DISCHARGE PERMIT NUMBER COR-040000 <br />L INTRODUCTION <br />The permit is for the regulation of stormwater runoff associated with metal mining operations and metal mine-waste <br />remediation projects. The term "metal" is used to distinguish this permit from the general permit for coal mining with surface <br />discharge only, the general stormwater permit for sand and gravel mining and processing (and other nonmetallic minerals), <br />and oil shale operations covered under the general stormwater permit for light industry. Other terms are defined in the permit. <br />This permit is also intended to cover stormwater discharges from coal mines that have individual CDPS permits for discharge <br />of process waters. <br />This Rationale will bri fly explain the background of the stormwater program, activities which are covered under this permit, <br />how to apply for coverage under this permit, and the requirements of this permit. <br />A. Changes In Renewal Permit <br />1. Small Municipal Exemption: The previous Rationale included a discussion of the exemption from industrial stormwater <br />permittingfor small municipalities. This exemption ended as of March 10, 2003. Municipalities under 100,000 <br />population are now subject to the same stormwater permitting requirements for their industrial facilities (e.g., gravel <br />pits, wastewater treatmentplants, construction projects) as otherfacility owners and operators. See <br />http://www.cdphe state co us/wa?T'ermitsUnit/SW.-Muni-Ind-OA.pdffor further information. No changes were made to <br />the permit for this item. <br />2. De initions: Some definitions have been added or changed for clarity. <br />3. Application Requirements: The permit application requirements have changed slightly to require an email address, if <br />available. See Part LA.3.b. <br />4. Temporary Coverage: Part LA.4.d of the permit dealt with temporarily covering a facility under the general permit <br />even if an individual permit is more appropriate. This section essentially duplicated the previous section, and so it has <br />been deleted. <br />5. StormwaterManagementPlan (SWMP): <br />Compliance Schedule: For newly certified facilities, if the SWMP prepared in conjunction with the permit <br />application requires a compliance schedule, it generally shall not exceed 60 days. See Part I.B. and Part I. C. <br />Site Map: The requirements for the SWMP have been changed to add several items to the site map. If a permittee's <br />existing SWMP does not already contain these items, the plan must be amended to comply with these changes, by <br />December.1, 2006. See Part I.B.3 and I.C2. <br /> <br />• <br />Stormivater Management Controls, Inactive Mines Only. This section has been expanded slightly to require a SWMP <br />administrator to be identified, and to require a more complete list of stormwater controls. In addition, for inactive <br />mining sites where mine remediation or other activities are occurring, the SWMP must also include other sections from <br />the SWMP requirements for active mines, as applicable. See Part I.C.3.b. <br />ISSUED AUGUST 28, 2006 EFFECTIVE OCTOBER 1, 2006 EXPIRATION SEPTEMBER 30, 2011