2009-11-12_HYDROLOGY - M1984043 (2)

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PART II Permit - Page 26 of 23 Permit No. COR-340000 H. CHANGES IN THIS GENERAL PERMIT (cont.) H. Employee Training The Employee Training section has been expanded to cover contractor and temporary personnel, in keeping with.other stormwater permits. Total Maximum Daily Load (TMDL) A section on TAMLs has been added. This section gives a general outline of the additional requirements that may be imposed by the Division if the facility discharges to a waterbody for which a stormwater-related TMDL is in place. See Section VI .A of the rationale and Part I.B. 10 of the permit. J. Record Keeping The Record Keeping section (Part I. C.5) was amended to clarify requirements for inspection reports generated during an inspection conducted in accordance with Part LB.5 of the permit. Inspection reports must be signed by the inspector, or the individual verifying the corrective action indicated in the inspection report, on behalf of the permittee. Inspection reports are not typically required to be submitted to the Division, and therefore, are not required to be signed and certified for accuracy in accordance with Part LC.6 of the permit. However, any inspection reports that are submitted to the Division must follow the signatory requirements contained in that section. K. Permit Termination Criteria A section has been added providing details on the criteria for terminating permit coverage. Sites that are covered by a bond under the Colorado Division of Reclamation, Mining, And Safety, or CDRMS, will need to prove that bond release has occurred before permit coverage can be terminated. Sites that are not under a CDRMS bond must provide additional information before the permit can be terminated. III. STORMWA TER PROGRAM As required under the Clean Water Act amendments of 1987, the Environmental Protection Agency (EPA) has establishea' a framework for regulating municipal and industrial stormwater discharges. This framework is under the National Pollutaizt Discharge Elimination System (NPDES) program. (Note: The Colorado program is referred to as the Colorado Discharge Permit System, or CDPS, instead of NPDES.) The Water Quality Control Division ("the Division') has stormwater regulations (5CCR 1002-61) in place. These regulations require specific types of industrial facilities that discharge stormwater associated with industrial activity (industrial stormwater), to obtain a CDPS permit for such discharge. The regulations specifically include sand and gravel mining activities as industrial facilities. Facilities that discharge industrial stormwater either directly to surface waters or indirectly, through municipal separate storm sewers, must be covered by a permit. IV. COVERAGE UNDER THIS PERMIT - INDUSTRIAL CATEGORIES A. Types offacilities Covered The types of facilities covered by this permit include all mining and quarrying of nonmetallic minerals, except fuels. This is thcr description of Standard Industrial Classification (SIC) Code 14. Also, stormwater from dedicated asphalt and concrete batch plants and recycling activities located at sand and gravel operations is covered by this permit, due to their similarity to the covered mines in pollution potential, and their function as an adjunct to the mine operations. (The definition of asphalt and concrete batch plants can include the use of recycled asphalt or concrete) The categories include: SIC Code Industry Tvpe SIC Code Industry Tvpe 141 Dimension stone 142 Crushed and broken stone 144 Sand and gravel 145 Clay, ceramic, and refractory minerals 147 Chemical and fertilizer mineral mining 2951 Asphalt batch plants 148 Nonmetallic minerals services, except fuels (overburden removal, strip mining, etc.) 149 Miscellaneous nonmetallic minerals, except fuels (asbestos, gems, fill dirt pits, graphite, gypsum, peat, pumice, talc, etc.) 3273 Concrete batch plants