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Page 24 of 38 <br /> Permit No: MNR040000 <br /> (a) Aluminum or Iron <br /> (b) Phosphorus <br /> (3) The following system parameters and how each was determined: <br /> (a) Flocculent settling velocity <br /> (b) Minimum required retention time <br /> (c) Rate of diversion of stormwater into the system <br /> (d) The flow rate from the discharge of the outlet structure <br /> (e) Range of expected dosing rates <br /> 4. Treatment System Management <br /> The following site-specific procedures shall be developed and a copy kept on-site: <br /> a. Procedures for the installation, operation and maintenance of all pumps,generators, <br /> control systems, and other equipment <br /> b. Specific parameters for determining when the solids must be removed from the system <br /> and how the solids will be handled and disposed of <br /> c. Procedures for cleaning up and/or containing a spill of each chemical stored on-site <br /> G. Stormwater Pollution Prevention Program (SWPPP) Modification <br /> 1. The Commissioner may require the permittee to modify the SWPPP as needed, in <br /> accordance with the procedures of Minn. R. 7001, and may consider the following factors: <br /> a. Discharges from the small MS4 are impacting the quality of receiving waters. <br /> b. More stringent requirements are necessary to comply with state or federal regulations. <br /> c. Additional conditions are deemed necessary to comply with the goals and applicable <br /> requirements of the Clean Water Act and protect water quality. <br /> 2. Modifications that the permittee chooses to make to the SWPPP document developed <br /> under Part ILD, other than modifications authorized in Part III.G.3 below, must be approved <br /> by the Commissioner in accordance with the procedures of Minn. R. 7001. All requests must <br /> be in writing, setting forth schedules for compliance.The request must discuss alternative <br /> program modifications, assure compliance with requirements of the permit, and meet other <br /> applicable laws. <br /> 3. The SWPPP document may only be modified by the permittee without prior approval of the <br /> Commissioner provided it is in accordance with a. or b. below, and the Commissioner is <br /> notified of the modification in the Annual Report for the year the modification is made. <br /> a. A BMP is added, and none subtracted, from the SWPPP document. <br /> b. A less effective BMP identified in the SWPPP document is replaced with a more <br /> effective BMP.The alternate BMP shall address the same, or similar, concerns as the <br /> ineffective or failed BMP. <br />