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SECTION 5 Surface Water Management Plan Section 5: Goals and Policies City of Arden Hills WSB Project No. 3455-200 Page 2 Round 62-0070 7/shallow 130 Full Support (M) Valentine 62-0071 14/4.5 64 Non-Supported Sunfish 62-0065 5/shallow 14 Non-Supported Marsden 62-0059 5.5/shallow 271 Non-Supported Karth 62-0072 14/shallow 20 Non-Supported Johanna 62-0078 41/17 214 Partial Support Little Johanna 62-0058 28/shallow 17 Non-Supported Lake Josephine boasts a fully supported swimmable use classification, although it is sensitive to increases in phosphorus nutrient loading. Round Lake has been known to contain pollutants from the former TCAAP plant in the bottom sediment. There is no access to Round Lake for swimming use due to physical restrictions. Lake Johanna only partially supports swimmable use classification due to algae blooms and low transparency for a significant portion of the summer. Karth, Little Lake Johanna, and Valentine lakes do not support swimmable use classification due to severe and frequent algae blooms and low transparency for most of the summer. Round, Karth, Little Lake Johanna and Valentine lakes have either small surface areas or are quite shallow in average depth and therefore would not be considered likely candidates for swimmable use. However, water quality data in support or non-support of this use is important for wildlife management of these water bodies. Under the federal Clean Water Act, the State of Minnesota is required to monitor and assess their waters to determine if they meet water quality standards and support the beneficial uses they are intended to provide. The MPCA has developed a draft Total Maximum Daily Load (TMDL) list per Title 303(d) of the Clean Water Act. 5.3. NPDES Stormwater Pollution Prevention Plan Minimum Control Measures The MPCA has identified the goals of the MS4 permit to restore and maintain the chemical, physical, and biological integrity of waters of the state through management and treatment of urban storm water runoff. This is accomplished by requiring the preparation of a Stormwater Pollution Prevention Program (SWPPP) from MS4’s. Phase II requires municipal separate storm sewer systems (MS4s) in urban areas with populations over 10,000 and under 100,000 to obtain an NPDES permit. Permits for construction sites greater than one acre will also be required as part of the Phase II. The City has submitted its Stormwater Pollution Prevention Plan and Notice of Intent in conformance with the MPCA guidelines. The application that was sent to the MPCA is included in Appendix J. The current MPCA MS4 Coverage Letter is included in Appendix K. The City of Arden Hills has identified best management practices (BMPs) and measurable goals associated with specific minimum control measures (MCM). The following table summarizes the BMPs for each MCM. Reference Arden Hill’s SWPPP for specific information on implementing the BMPs. Dr a f t 11 / 2 0 / 2 0 1 7