2009-11-12_HYDROLOGY - M1984043 (2)

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RATIONALE STORMWA TER DISCHARGES ASSOCIATED WITH ' SAND AND GRAVEL PRODUCTION OPERATIONS (AND OTHER NONMETALLIC MINERALS EXCEPT FUEL) GENERAL PERMIT IN COLORADO COLORADO DISCHARGE PERMIT NUMBER COR-340000 NEW PERMIT CONTENTS PAGE I. INTRODUCTION - NEW PERMIT I II . CHANGES IN GENERAL PERMIT I III. STORMWATER PROGRAM 3 IV. COVERAGE UNDER THIS PERMIT 3 V. APPLICATIONAND CERTIFICATION 4 VI TERMS AND CONDITIONS OF PERMIT 4 VTi I-PA MCF.C AFTFR PTIRI,IC NOTICE 6 INTROD UCTION - NEW PERMIT This is a new stormwater discharge general permit. It incorporates the stormwater provisions from the Division's Sand and Gravel Mining and Processing (and Other Nonmetallic Minerals Except Fuel) General Permit (COG-500000). That permit covers both process water and stormwater discharges. Permit COG-500000 will be renewed separately and will addresses additional pollutants of concern, such as selenium. Due to the expected complexity of the renewed permit, the Division determined that sand and gravel operations that only discharge stormwater could be covered under a separate stormwater-only discharge permit. All existing stormwater-only dischargers covered under the COG-500000 permit, who have reapplied, will be automatically transferred to coverage under this new permit (COR-340000), and will be assigned a new permit certification number. This permit is for the regulation of stormwater discharges associated with sand and gravel mining operations. (The permit also covers other nonmetallic minerals except fuel; all references to sand and gravel will include the other minerals, unless specifically exempted. Dedicated asphalt and concrete batch plants and recycling areas at these,facilities may also be covered.) This rationale will explain the activities and discharges that are covered under this permit, how to apply_for coverage under the permit, and the requirements of the permit. The forms discussed in the rationale and permit are available on the Water Quality Control Division's website at:. wtiti74,. cdplte..state. co. usAvq/Permits Unit II. CHANGES IN THIS GENERAL PERMIT This permit incorporates the stormwater provisions from the Division's Sand and Gravel Mining and Processing (and Other Nonmetallic Minerals Except Fuel) General Permit (COG-500000). However, there have been several notable changes from the COG-500000 permit, which have been incorporated into this permit. Significant changes are listed below. Numerous other minor changes, including revisions to the order ofsections, were made for clarification purposes only. A. Permit Coverage 1. New Permit: As discussed above, this is a new permit, although it incorporates most of the provisions from the Division's existing Sand and Gravel General Permit. Only discharges of stormwater are covered. 2. Concrete and Asphalt Recycling: The list of facility types that are covered by the permit has been expanded to include the recycling of concrete and asphalt (when done consistent with the activity descriptions for Standard Industrial Classification (SIC) Code 14). This type of activity has been routinely covered under this permit; the additional language formalizes this practice. B. Application Requirements The permit application requirements have changed slightly, including the addition of an email address, if available. See Part LA.3. ISSUED AUGUST 31, 2007 EFFECTIVE OCTOBER], 2007, EXPIRATIONDATE SEPTEMBER 30, 2012