Resolution_City of Roslyn_PF Funding Award Agmt

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7.2. Equivalent New/Redevelopment Areas The Equivalent New/Redevelopment Areas for the project are summarized in Appendix D. Ten (10) of the biofiltration swales will achieve full stormwater treatment equivalent to a new/redeveloped project and ten (10) of the biofiltration swales will achieve partial stormwater treatment within their respective subbasins. The overall water quality benefit to be realized within the study area is 31 percent. This is quantified by comparing the total calculated Equivalent New/Redevelopment Areas, 46.6 acres, to the Treatment Assessment Area, 152.0 acres. The water quality benefit can be further refined with the advancement of each CIP. 8. Capital Improvement Plan The BMPs are based on the preliminary design calculations. Multiple considerations should be made for design implementation. Site investigations including topographic survey and geotechnical evaluations should be conducted for effective design of each BMP. Public outreach should be organized to gather input and support for project improvements. Final design should include the consideration of sizing for snow storage, selection of site appropriate plantings for the region, and access for operations and maintenance. Engineering and construction administration should be included for effective design and construction of each BMP. The BMPs within the study area are divided into three separate CIPs for project planning purposes: CIP 1, CIP SW -1, and CIP SW -2. CIP 1 includes the biofiltration swales identified within the CIP 1 Treatment Assessment Area. The CIP 1 treatment project will be advanced in detail design after study completion. CIP SW -1 and CIP SW -2 include the remaining biofiltration swales identified in the Treatment Assessment Area. Biofiltration swales in CIP SW -1 and CIP SW -2 are grouped to include a similar quantity of biofiltration Swale area as compared to the CIP 1 treatment project. The estimated construction cost of CIP SW -1 includes Biofiltration B1, B2, C1A, D1, and D2. The estimated construction approximated cost of CIP SW -2 includes Biofiltration B14, B15A, B16A, D4, G2, H4, and H5. CIP SW -1 and CIP SW -2 may be implemented through individual biofiltration Swale design and construction, or in clusters as specific stormwater treatment funding is available and/or incorporated with roadway improvement projects.