2009-11-12_HYDROLOGY - M1984043 (2)

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PART II Permit - Page 28 of 23 Permit No. `COR-340000 VI. TERMS AND CONDITIONS OF PERMIT (cont) 3. Stormwater Quality Controls a) SWMP Administrator b) Materials handling and spill prevention c) Erosion and sediment controls d) Other pollution prevention measures e) Preventive maintenance J) Good housekeeping g) Identification of discharges other than stormwater. C. Practice-Based Effluent Limitations and BMPs The permit does not impose numeric effluent limits or require submission of effluent monitoring data for stormwater discharges covered under this permit. The permit instead imposes practice-based effluent limitations for stormwater discharges through the requirement to develop and implement a SWMP. The permit conditions for the SWMP include the requirement for dischargers to select, implement and maintain Best Management Practices (BMPs) at a permitted site that adequately minimize pollutants in the discharges to assure compliance with the terms and conditions of the permit. Part I.B.2.c of the permit includes requirements for basic design standards for BMPs implemented at the site. Facilities must select, install, implement, and maintain appropriate BMPs, following good engineering, hydrologic and pollution control practices. BMPs implemented at the site must be adequately designed to control all potential pollutant sources associated with mining activity to prevent pollution or degradation of State waters. Pollution is defined in CDPS regulations (5CCR 1002-61) as man-made or man-induced, or natural alteration of the physical, chemical, biological, and radiological integrity of water. Utilizing industry-accepted standards for BMP selection that are appropriate for the conditions and pollutant sources present, will typically be adequate to meet these criteria. However, site-specific design, including ongoing assessment of BMPs and pollutant sources, is necessary to ensure that BMPs operate as intended. The permit further requires that stormwater discharges from industrial activities shall not cause, have the reasonable potential to cause, or measurably contribute to an excursion above any water quality standard, including narrative standards for water quality. This condition is the basis for all CDPS Discharge permits, and addresses the need to ensure that waters of the Sate maintain adequate water quality, in accordance with water quality standards, to continue to meet their designated uses. It is believed that, in most cases, BMPs can be adequate to meet applicable water quality standards. If water quality impacts pre noted, or the Division otherwise determines that additional permit requirements are necessary, they are typically imposed as follows: ])at the renewal of this general permit or through a general permit specific to an industrial sector (if the issue is sector-based); 2) through direction from the Division based on the implementation of a TMDL (f the issue is watershed- based); or 3) if the issue is site-specific, through a revision to the certification from the Division based on an inspection or SWMP review, or through an individual permit. D. Other Requirements 1. Facility Inspections: The permittee will be required to make a thorough inspection of their stormwater management system, at least twice per year (in the spring and fall). (See Part LB.5 of the permit for alternate schedules.) These inspections must be documented and summarized in the Annual Report to the Division. 2. Employee Education: The permittee shall develop and implement employee education programs to inform personnel at all levels of responsibility of the components and goals of the SWMP. 3. Annual Report: As outlined under Part I. C.2 of the permit, an Annual Report must be submitted to the Division, covering January 1 through December 31, on the overall compliance with the SWMP. The Stormwater Annual Report will be clue to the Division on or before February 15 of the following year. The exact due date for the permittee's first Annual Report will be listed in their permit certification. All reports required for submittal shall be signed and certified for accuracy by the permittee. (See Part L C.6 of the permit.) Kathryn Dolan July 25, 2007