2009-11-12_HYDROLOGY - M1984043 (2)

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PART II Permit - Page 25 of 23 Permit No. COR-340000 II. CHANGES IN THIS GENERAL PERMIT (cont.) C. General Limitations Several additions and clarifications were made to this section: 1. Bulk Storage: General requirements for bulk storage structures for petroleum products and other chemicals were clarified to state that secondary containment or equivalent adequate protection is required. 2. Erosion Prevention: A statement was added clarifying that all stormwater shall be discharged in a manner to prevent erosion, scouring, or damage to stream banks, streambeds, or ditches. D. Stormwater Management Plan (SWMP) ' The SWMP Contents section has been modified. Some of the changes are limited to organization of information, which does not require modification of an existing permittee's current SWMP. Most of the SWAP changes involve either clarifications, reformatting, or adopting requirements from the Division's other stormwater general permits (e.g., BMP installation specifications). For existing permittees (i. e,, those with permit coverage under permit COG-500000 before September 30, 2007), their SMWP must be amended to include the new required items. For existing permittees, any SWMP changes based on the change in permit requirements must be completed by March 1, 2008. The plan is not to be submitted to the Division unless requested, but must be available on site as outlined in Part I.B. 7.b of the permit. I.- Site Map: The list of items needed for the Site Map has been expanded, in order to adequately characterize the site. A list of items and factors has been added to the section on identifying potential stormwater pollutants, in order to clarify the Division's intent in this area. This requirement may necessitate changes to existing permittees' SWMPs. 2. Description of Potential Pollutant Sources: The requirement to identijy Potential Pollutant Sources has been expanded to include more details for the evaluation of such sources. This evaluation allows for the appropriate selection. of BMPs for implementation at a facility or site. This requirement may necessitate changes to existing permittees' SWMPs. 3. Stormwater Management Controls: This section has been modified to require that the SWMP provide installation and implementation specifications for each BMP identified in the SWMP. For structural BMPs, in most cases, this must include a technical drawing to provide adequate installation specifications. See Part I.B.2.c of the permit. Sections have also been added requiring that preventive maintenance and good housekeeping measures be included in the SWMP. Preventive maintenance is critical to ensuring the success of the BMPs at a site. Good housekeeping measures are a common sense means of increasing compliance with the permit. This requirement may necessitate changes to existing permittees' SWMPs. E. Stormwater Discharges - BMP Implementation and Design Standards Part I.B.3 of the permit reiterates the requirement that facilities select, install, implement, and maintain appropriate BMPs, following good engineering, hydrologic and pollution control practices. This part also requires that BMPs must be adequately designed to prevent pollution or degradation of State waters. Additional language was also added to Section VI. C of the rationale discussing these BMP requirements and further clarifying the expectations for compliance with this permit. E Consistencv with Other Plans A section has been added claming that other documents, such as an SPCC, can be used to meet some of the SWMP requirements, provided that the other documents are readily available and the SMWP includes appropriate cross references. G. Inspections A section has been added explaining the inspection requirements for sites undergoing reclamation.