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Coverage issued: October 28, 2021 Permit expires: November 15, 2025 MS400047 Page 19 of 28 If item b is applicable, the permittee must also report the non-compliance to the Commissioner as required in item 26.11. [Minn. R. 7001.0150, subp. 3(K), Minn. R. 7090] 23.10 If the permittee discovers indications of toxicity or measurements exceeding water quality standards that the permittee determines does not endanger human health, public drinking water supplies, or the environment, the permittee must report the non-compliance to the Commissioner as required in item 26.12. [Minn. R. 7001.0150, subp. 3(L), Minn. R. 7090] 23.11 The permittee must submit the following information with the annual report. The annual report must include a month -by -month summary of: a. date(s) of operation; b. chemical(s) used for treatment; c. gallons of water treated; d. gallons of alum or ferric chloride treatment used; e. calculated pounds of phosphorus removed; and f. any performance issues and the corrective action(s), including the date(s) when corrective action(s) were taken. [Minn. R. 7090] 23.12 A record of the design parameters in items 23.13 through 23.15 must be kept on -site. [Minn. R. 7090] 23.13 Site-specificjar testing conducted using typical and representative water samples in accordance with the most current approved version of ASTM D2035. [Minn. R. 7090] 23.14 Baseline concentrations of the following parameters in the influent and receiving waters: a. aluminum or iron; and b. phosphorus. [Minn. R. 7090] 23.15 The following system parameters and how each was determined: a. flocculant 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; and e. range of expected dosing rates. [Minn. R. 7090] 23.16 The following site -specific procedures must 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, and c. procedures for cleaning up and/or containing a spill of each chemical stored on -site. [Minn. R. 7090] 24.1 Stormwater Pollution Prevention Program (SWPPP) Modification. [Minn. R. 7090] 24.2 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 MS4 are impacting the quality of receiving waters; b. more stringent requirements are necessary to comply with state or federal regulations; and c. additional conditions are deemed necessary to comply with the goals and applicable requirements of the Clean Water Act and protect water quality. [Minn. R. 7090] 24.3 Modifications that the permittee chooses to make to the SWPPP other than modifications authorized in item 24.4, 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. [Minn. R. 7090] 24.4 The permittee may modify the SWPPP without prior approval of the Commissioner provided the Commissioner is notified of the modification in the annual report for the year the modification is made and the modification falls under one of the following categories: