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BMP Descriptions <br />as inputs into the IESF. Various iterations of IESFs were modeled to identify an optimal treatment level <br />compared to construction costs and space available. A detailed account of the methodologies used is <br />included in Appendix A. <br />To account for the DP treated by the IESF, an additional 80% DP removal was assumed for each IESF in <br />addition to any removal by the pond. This value is based on laboratory and field tests performed by the <br />University of Minnesota (Erickson & Gulliver, 2010) and assumes only removal of DP species within the <br />device. Load reduction estimates for these projects are noted in the Catchment Profiles sections. <br />In order to calculate cost -benefit, the cost of each project had to be estimated. IESF projects were <br />assumed to involve some excavation and disposal of soil, land acquisition (if necessary), erosion control, <br />and vegetation management. Additionally, project engineering, promotion, administration, <br />construction oversight, and long-term maintenance had to be considered in order to capture the true <br />cost of the effort. Annual maintenance costs were estimated to be $10,000 per acre of IESF based on <br />information received from local, private consulting firms. <br />City of Ramsey Stormwater Retrofit Analysis <br />