2015-05-26_PWETC_AgendaPacket - Laserfiche WebLink

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