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Page 13 of 26 <br />Pcrmit No: MN R 10000 1 <br />runoff events sampled), identify lab used to analyze the samples and quality assurance and <br />quality control methods to be used. The plan must include a schedule for submitting the <br />monitoring data annually. <br />c. A mitigation plan that addresses how the water quality volume will be treated in the event <br />that the monitoring data shows the proposed alternative treatment method does not function <br />as designed. <br />d. The alternative method must achieve approximately 80% removal of total suspended solids <br />on an average annual basis for the conditions expected at the site. The design must also <br />consider public safety, health and water quality concerns. Proprietary information on <br />effectiveness will not be considered for alternative treatment method review and approval. <br />No construction activity on the project is covered under this permit until the applicant receives <br />an alternative treatment approval letter from the MPCA as described in Part 11.13.3.c. <br />D. RECORD RETENTION <br />The SWPPP,all changes to it, and inspections and maintenance records must be kept at the site <br />during construction by the Permittee who has operational control of that portion of the site. The <br />SWPPP can be kept in either the field office or in an on site vehicle. <br />All owner(s) must keep the SWPPP, along with the following additional records, on file for three <br />years after submittal of the NOT as outlined in Part 11.C. This does not include any records after <br />submittal of the NOT. <br />1. Any other permits required for the project; <br />2. Records of all inspection and maintenance conducted during construction (see Part W.E. <br />Inspections and Maintenance); <br />3. All permanent operation and maintenance agreements that have been implemented, including all <br />right of way, contracts, covenants and other binding requirements regarding perpetual <br />maintenance; and <br />4. All required calculations for design of the temporary and permanent storm water management <br />systems. <br />PART IV. CONSTRUCTION ACTIVITY REQUIREMENTS <br />A. STORM WATER POLLUTION PREVENTION PLAN <br />The Permittee(s) must implement the SWPPP and the requirements of this part. The Best <br />Management Practices (BMPs) identified in the SWPPP and in this permit must be installed in all <br />appropriate and functional manner. <br />B. EROSION PREVENTION PRACTICES <br />1. The Permittee(s) must plan for and implement appropriate construction phasing, vegetative <br />buffer strips, horizontal slope grading, and other construction practices that minimize erosion, so <br />wq-su m2-51 <br />