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<br />I <br />~ <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />. <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br /> <br />I <br /> <br />8.15.01 <br /> <br />Maintenance and Street Sweeping Program/Schedule <br /> <br />Maintenance and Inspection <br /> <br />Routine maintenance reduces long-term capital improvement costs related to <br />the City's drainage system, while achieving water quantity and water quality <br />goals, Inspections help to frod problems in the drainage system before they <br />become major problems. <br /> <br />Below are the recommended maintenance and inspeetion activities the City <br />should undertake to ensure that their drainage system is performing efficiently <br />and effectively: <br /> <br />Storm Sewers <br /> <br />1. Inspect storm sewer outfalls on an annual basis for evidence of scouring <br />or the presence of significant deposition of silt. Scouring problem areas <br />will be noted and stabilized. In areas where silt deposition is evident, <br />which is indicative of significant erosion upstream, an inspection of the <br />upstream watershed will be made to identify the source of erosion. Once <br />this erosion problem is determined suitable corrective measure will then <br />be undertaken to eorrect the problem. <br /> <br />Ponds and Wetlands <br /> <br />1. Visually inspect stormwater retention and detention ponds every two <br />years to determine if the pond is performing adequately. <br /> <br />2. Conduct a pond bottom survey every ten years to determine required <br />"dead storage" volume. Once a pond has lost half of its dead storage <br />volume, the accumulated sediment should be removed from the pond. <br /> <br />3. A pond maintenance agreement with private pond owners shall be <br />required. This will ensure that private ponds are kept in good operating <br />condition and that routine maintenance occurs. See Appendix M for an <br />example agreement. <br /> <br />4. Review the salt/sand applieation policy for its balance with public safety <br />and environmental protection. <br /> <br />Street Sweeping <br /> <br />Street sweeping is most effective in removing coarse particles, sand, leaves, <br />debris, and other similar materials. It is recommended to have a semiannual <br />street sweeping program, with the most beneficial sweeping is accomplished <br />early in the spring after snow melt, and in the fall after the leaves have fallen. <br />It has not been proven that sweeping the streets more than twice a year <br />provides a significant increase in sediment removal. So in terms of a <br />cost/benefit ratio it does not make sense to sweep the streets more than twice a <br />year at this time. <br /> <br />A-ARDEN0101.00 <br />Page 28 <br /> <br />City of Arden Hills, Minnesota <br />Local Stormwater Management Plan <br />