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memo 4 of 6 ii. Tree trenches iii. Green infrastructure iv. Residential raingardens Cost - Benefit Analysis Recommended Actions Preliminary cost estimate = $40,000 - $80,000. Development of a more refined stormwater management plan (again a plan that is more detailed that what would be developed for the TMDL Restoration and Protection Plan and identifies specific individual BMPs or retrofits in the system) is estimated to cost $40,000. If the GLWMO would like to include an implementation project (e.g. addressing short-circuiting in Charlie Pond or the BMP /retrofit that provides the most phosphorous removal) the estimated cost would be $80,000. 3. Sustainability Plan for Central Park System The City of Roseville's Central Park System accounts for a significant amount of open space in the southern portion of the watershed. Within this park system there is a chain of wetlands (adjacent to or a part of the Ramsey County Ditch 19 system) that contribute a substantial nutrient load to Lake Owasso (as documented in the Use Attainability Analysis). The current draft of the Watershed Management Plan contains an implementation item that states "Work with the City of Roseville (parks) to explore and implement retrofit projects, fertilizer management and additional tree planting in Central Park." The development of a sustainability plan for the Central Park System would involve an evaluation of existing infrastructure and practices and look for ways to reduce the water quality impact to Lake Owasso, the most downstream resource. This sustainability plan would evaluate the following types of activities /practices; • Protect waterways, shorelines and wetlands — maintain native plant buffers around wetlands • Evaluate the amount of imperviousness in the park system and consider pervious paving for playgrounds and all hardscapes • Create bio- swales and vegetation strips in heavy traffic use and parking areas to catch and filter runoff (e.g. develop new parking lot designs) • Reuse storm water for irrigation (e.g. cisterns) and develop sustainable irrigation practices • Create demonstration landscapes as a tool to educate the public on how to landscape using native and low -water use plants • Manage use of water efficiently and effectively • Record water usage • Identify and eliminate leaking pipelines, valves, etc. • Disconnect inlets to the wetland system • Identify and eliminate waste • Use reclaimed water for irrigation, toilets and laundry • Landscape with native vegetation and reduce or eliminate lawns • Evaluate green building standards /applications to park facilities Preliminary cost estimate = $40,000 - $60,000 depending upon the level of effort: $40,000 would address the stormwater management components of the Sustainability Plan while $60,000 would address all components of a Sustainability Plan (e.g. irrigation, energy efficiency of buildings, equipment replacement, mowing, composting, etc.). Emmons & Olivier Resources, Inc. 651 Hale Ave N, Oakdale, MN 55128 p: 651.770.8448 f: 651.770.2552 www.eorinc.com