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City is significant. In fact, the resources needed to maintain the system will likely grow due to more treatment devices being installed each year and the need to conduct maintenance on those that have been in service for 20 years or more. One of the most challenging ongoing maintenance needs will be the pond cleanout work that relates to requirements of the NPDES MS4 Permit Program. The MPCA recently published Managing Stormwater Sediment Best Management Practice Guidance for Municipalities (June 2012) and describes when the dredged sediment can be used as unregulated clean fill and when it is considered regulated solid waste. The cost difference can be significant depending on the levels of contaminants of concern found in tested sediment samples. 1.3.4 Education and Outreach Managing storm water is no longer just the responsibility of the City. A coordinated approach with residents, local interest groups, developers, City and watershed staff, and elected officials is needed in order to achieve local water quality improvements and meet the goals of this plan. The City is required to complete public education efforts as part of its NPDES MS4 Permit Program. The City has also conducted and supported a number of educational programs such as rain water garden workshops that help residents contribute to community efforts. These efforts will continue to be critical towards improving management of grass clippings, fertilizers, chemicals and yard waste. The efforts will help to reduce the chances of a residential backyard grading project that might change the flow of storm water, and they will help inform the public of fish consumption advisories on area lakes and invasive species issues. Implementation Program and Funding. These Sections of the Plan provide additional background on what sustainability is and how it is a critical part of this Plan and what actions and approaches the City will take, related to its surface water management program, towards being more sustainable. 2.0 Physical Environment 2.1 Climate and Precipitation The climate of Roseville is considered to be continental and subhumid. Because of its location near the center of the North American continent the Twin Cities metropolitan area (and Minnesota) experiences a wide variation in climate conditions (e.g., droughts and floods, heat and cold). However, even with these wide variations, climatologists have found four significant climate trends in the Upper Midwest (Minnesota Weather Almanac, Seeley, 2006): • Warmer winters • Higher minimum temperatures • Higher dew points • Changes in precipitation trends Comprehensive Surface Water Management Plan ROSEV120222 City of Roseville Page 4