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Table 8.2 - Stormwater System Maintenance Schedule BMP Street sweeping Maintenance Schedule Twice annually Catch basins Inspected every 5 years, cleaned and repaired as needed Trunk storm sewer Televised and jetted on a scheduled rotation Stormwater ponds Inspected every 5 years, cleaned as needed Stormwater pond inlets/outlets Inspected every 5 years, cleaned as needed Structural treatment devices, including sump manholes and grit chambers Inspected annually, cleaned as needed Generally, surface water system maintenance in Mounds View is funded by the City's Storm Water Management Fund. The City's Storm Water Management Fund rates are reviewed annually to verify that the Fund balance is adequate to fund the surface water management implementation activities identified in the City's Capital Improvement Plan. 8.2.1 STORMWATER POND MAINTENANCE PROGRAM In addition to the City's current inspection procedures for City -maintained stormwater ponding basins, City staff has expressed interest in developing a Stormwater Pond Maintenance Program. The intent of this program is to establish specific guidelines for stormwater pond maintenance, including: ■ Design volume estimation ■ Tracking sediment deposition ■ Sediment removal triggers ■ Sediment disposal process 8.2.2 DE-ICING PRACTICES The City receives approximately 54 inches of snow during a typical year. This requires a large amount of de-icing chemicals (primarily salt) to be applied to roads and sidewalks each winter. Estimates indicate that 80 percent of the environmental damage caused from de-icing chemicals is a result of inadequate storage of the material (MPCA 1989). Improper storage as well as overuse of salt increases the risk of high chloride concentrations in runoff and groundwater. High chloride concentrations can be toxic to fish, wildlife, and vegetation. Stockpiles of de-icing material in the City are stored in an enclosed building on an impervious surface. Runoff from stockpiles is managed to minimize the possibility of flowing directly into streams or wetlands where environmental damage can occur. The City follows established snow and ice removal practices to address winter maintenance needs. Street conditions are assessed for each individual event, and ice control material application is adjusted accordingly. Equipment is maintained in good working order to place ice control material on roadways City of Mounds View 45 Local Surface Water Management Plan Stantec Project No. 193804166 5 5ta nte+c