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b) Provide for settling chambers, sumps, dry ponds or other devices to provide filtering and settling of fine sands prior to discharge to city stormwater systems. 4. All private stormwater systems shall be maintained to operate as originally designed. VI. CONCEPTUAL PLAN FOR SURFACE WATER MANAGEMENT The Northwestern Campus is divided into two distinct areas which can viewed as the Arden Hills development jurisdiction area (north half of the Campus) and Roseville development jurisdiction area (South half of the Campus). As discussed above, both halves of the Campus will require RCWD and NPDES permits for development permits and the southern half of the Campus will also need to comply with the City of Roseville rules. Within this context, the College will also need to be mindful of the fact that all of these rules are evolving from using existing conditions as the base watershed condition to a pre -settlement condition as the base watershed condition. Stormwater Best Management Practices (BMPs) (Figures 5 and 6 and Table 1) that seem particularly appropriate for the Campus include: A. WET DETENTION PONDS This is the classic Stormwater Treatment BMP, commonly referred to as the 'Walker Pond" in Minnesota. Such a pond captures and retains runoff during storm events which controls both stormwater quantity and quality. The pond's natural physical, biological, and chemical processes then work to remove pollutants. Sedimentation processes remove particulates and organic matter, while dissolved nutrients are removed through biological uptake. Several such ponds currently exist on Campus near the Totino Fine Arts Center in the North (Arden Hills) area of the Campus and near the Erickson Center and the Hartill-Knutson Residences and Robertson Student Center. Northwestern College Master Plan 13 13529.000 Stormwater Management Study