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SECTION 4 <br /> <br /> <br /> <br /> <br />Surface Water Management Plan Section 4: Assessment of Issues <br />City of Arden Hills <br />WSB Project No. 3455-200 Page 1 <br />4. ASSESSMENT OF ISSUES <br /> <br />Outlined below is an assessment of existing and potential local water resource-related problems that are <br />known as of September 2017. These problems have been identified based on an analysis of the land and <br />water resource data collected during the preparation of this plan and through information provided by the <br />City, its residents, and the watershed organizations. A description of any existing or potential problem <br />within the City has been listed and potential future corrective actions have been incorporated into an <br />implementation plan. <br /> <br />This Plan documents city-wide drainage issues identified by City staff. The City will evaluate each <br />drainage issue as part of a feasibility study and address them accordingly. <br /> <br /> <br />4.1. Water Quality <br /> <br />Problem 4.1.A. The City discharges to the following impaired waters as listed by the Minnesota <br />Pollution Control Agency (MPCA): <br /> <br /> Rice Creek <br /> Valentine Lake <br /> Lake Johanna <br /> Little Johanna Lake <br /> Lake Josephine <br /> Upper Mississippi <br /> Long Lake South <br /> <br />Section 2 provides additional information on the impairments for each water body. <br /> <br />Corrective Action 4.1.A The MPCA completed a statewide mercury TMDL in 2007. As <br />stormwater point sources account for less than 1% of the mercury (majority is atmospheric), the <br />City contributes an insignificant amount to this TMDL. This TMDL is relevant for Lake Johanna <br />and Lake Josephine. <br /> <br />Per the RCWD Southwest Urban Lakes TMDL Study by the MPCA, the City has been given a <br />categorical waste load allocation (WLA) for Little Lake Johanna, Long Lake South, and Lake <br />Valentine excessive nutrient impairment TMDL requiring a 55% reduction for Little Lake Johanna, <br />36% reduction for Long Lake South, and 29% reduction for Lake Valentine from the base year <br />(2003). The City will outline improvements constructed since 2003 that will be used to <br />demonstrate compliance and where necessary construct improvements aimed at improving water <br />quality discharged toward these lakes. In addition, the City will work with neighboring <br />communities and the RCWD to meet its waste load allocations once the TMDL has been <br />completed. <br /> <br />The City will work with the MPCA, RCWD, and neighboring communities to address any future <br />impairments, TMDLs, and discharge to impaired waters as necessary. <br /> <br /> <br />4.2. Flooding and Stormwater Rate Control <br /> <br />Problem 4.2.A. Charles Perry Park trail floods, and this trail is the access to Lift Station #12. <br /> <br />Corrective Action 4.2.A. The City will investigate causes for the flooding and work both internally <br />and with designers to fix the flooding. <br />Dr <br />a <br />f <br />t <br /> <br />11 <br />/ <br />2 <br />0 <br />/ <br />2 <br />0 <br />1 <br />7