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I '- I I I I I E I -- I I I I I I ~ I 2,1102 OBJECTIVE F: Pollution Control and Good Housekeeping for Municipal Operations (AB). F.l Policy: To irnplement routine maintenance measures that reduce long-term capital improvement costs related to the City's drainage system, while achieving water quantity and quality goals. Appendix K has resources on maintenance activities for both the City and the residents. Below are the recommended maintenance and inspection activities the City should undertake to ensure that their drainage system is performing efficiently and effectively: Stonn Sewers 1. Inspect storm sewer outfalls on an annual basis for evidence of scouring or the presence of significant deposition of silt. Scouring problem areas will be noted and stabilized. In areas where silt deposition is evident, which is indicative of significant erosion upstream, an inspection of the upstream watershed will be made to identify the source of erosion. Once this erosion problem is determined, suitable corrective measure will then be undertaken to correct the problem. 2. Review the salt/sand application policy for its balance with public safety and environmental protection. Ponds and Wetlands 3. Visually inspect stormwater retention and detention ponds every two years to determine if the pond is performing adequately. 4. Conduct a pond bottom survey every ten years to determine required "dead storage" volume. Once a pond has lost half of its dead storage volume, the accumulated sediment should be removed from the pond, 5. A pond maintenance agreement with private pond owners shall be required. This will ensure that private ponds are kept in good operating condition and that routine maintenance occurs. See Appendix L for an example agreement. 6. If a constructed storm water treatment basin is to be used for replacement credit, the basin must be designed to retain at least 60 percent of the phosphorus loading from the runoff from a one-year, 24- hour storm based on a fully developed tributary watershed. (Wetland Conservation Act provisions [8420.0540]). Street Sweeping Street sweeping is most effective in removing coarse particles, sand, leaves, debris, and other similar materials. It is recommended to have a semi-annual street sweeping program, with the most beneficial sweeping is accomplished City of Arden Hills, Minnesota Local Water Resource Management Plan A-ARDEN0101,OO Page 33