02-20-18-WS - Laserfiche WebLink

Home Browse Search

SECTION 2 Surface Water Management Plan Section 2: Land and Water Resource Inventory City of Arden Hills WSB Project No. 3455-200 Page 11 phosphorus (TP). The ponds were modeled using only the immediate drainage areas, therefore, it is recommended to model the entire drainage system during either a feasibility study or final design to calculate the pollutant removal efficiencies of the entire system. Additional hydrological modeling is needed to identify subdrainage basins within the RCWD. Also needed is expanded modeling of the City as the current model does not analyze or determine flood elevations along the creeks streams or ditches. The results of these models can be seen in Appendix F. 2.5. Water-Based Recreation Areas Lakes Johanna and Josephine provide the most in terms of water-based recreation within the City of Arden Hills. The main public access points are through Ramsey County regional parks. Tony Schmidt Regional Park located on County Road E provides a swimming beach and boat ramp to Lake Johanna. Lake Josephine Park along Lexington Avenue within the City of Roseville provides a swimming beach and boat ramp to Lake Josephine. Rice Creek also offers recreational opportunities through a major recreational canoe route from George Watch Lake to Long Lake. A portion of this canoe route traverses the western portion of the TCAAP property owned and operated by Ramsey County Parks and Recreation. Lakes Valentine, Little Johanna, and Karth have limited use and public access with non- motorized boat recreation from surrounding property owners. Round Lake has no public access due to bottom sediment contamination. Marsden and Sunfish Lakes are within the TCAAP area, and are currently inaccessible to public use. Maintenance access in some TCAAP development’s stormwater features will be provided in form of a recreational, multi-use trail. 2.6. Groundwater Information on groundwater protection in Ramsey County is available on the Ramsey County website at https://www.ramseycounty.us/residents/environment/ramsey-conservation- district/groundwater-protection. According to the Ramsey County Groundwater Protection Plan (RCGPP) developed in 2010, municipal drinking water wells, which extract water from the deep Prairie du Chien-Jordan aquifer, are susceptible to contamination from the shallow groundwater table providing recharge to the aquifer. The main area of point-source within the City of Arden Hills responsible for groundwater contamination is the TCAAP area. The Groundwater Plume Map (Figure 1-1, p. 4 of the RCGPP) indicates a contamination plume extending westward from the site. Saint Paul Regional Water Services (SPRWS) provides water to the Arden Hills water utility through the City of Roseville. Apart from the TCAAP land, all areas of the city have access to the municipal water supply. When the TCAAP land is developed, it will have access to the same municipal water supply. Since SPRWS provides water service to the City, a wellhead protection plan for municipal wells is not necessary. Even though the City does not extract its water supply from wells, the City and RCWD will need to consider the possible down-gradient impacts of infiltrated storm water on groundwater quality. Development and redevelopment within the City relies more on infiltration best management practices for treatment of storm water runoff and increases risks for contamination of down- gradient wellheads in other municipalities. The Minnesota Department of Health (MDH) has developed guidelines for evaluating stormwater infiltration projects in vulnerable wellhead protection areas (July 2007). MDH provides a flow chart with six steps focusing on the location of Dr a f t 11 / 2 0 / 2 0 1 7