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4.9 LAMBERT AVENUE DRAINAGE STUDY Regional drainage from Lambert Park flows north through the property at 2255 Lambert Avenue. Low flows are conveyed in a storm sewer across the property, but larger flows travel overland diagonally across the property. The property has been subdivided into four lots and is in the process of being redeveloped. Accordingly, the City prepared the Lambert Avenue Drainage Study to determine ponding requirements on the property to control runoff leaving the site. The study recommended pond volumes, peak flow rates, and high water level to provide freeboard and maintain flows at existing conditions. 4.10 LONGVIEW ESTATES DRAINAGE STUDY The Longview Estates development in 2014 modified the grading, ponding, and an existing wetland in the area south of County Road H2 between Silver Lake Road and Longview Drive. Since that time, water levels in the existing wetland have been rising, resulting in wet back yards to the north and east of the wetland. The Longview Estates Drainage Study evaluated the hydraulics of the situation and recommends various grading, storm sewer, and outlet modifications to reduce the water levels in the area. 4.11 RAMSEY COUNTY GROUNDWATER PROTECTION PLAN The draft Ramsey County Groundwater Protection Plan was last updated in 2010. Ramsey County is now in the process of updating the plan. The City of Mounds View will submit a draft of the LSWMP to Ramsey County for review and comment. The groundwater protection plan provides a summary regarding the regulatory framework for groundwater protection in Minnesota. The Minnesota Department of Health (MDH) is the key agency that aims to prevent the pollution of water supplies to ensure safe drinking water sources and limit public exposure to contaminants. 4.11.1 WELL VULNERABILITY ASSESSMENT The MDH evaluated the vulnerability of Mounds View's municipal wells to contamination from surficial contaminants. The evaluation parameters included geology, well construction, pumping rate, and water quality; wells were classified as either Vulnerable or Not Vulnerable. The geologic sensitivity rating of the aquifers within the Drinking Water Supply Management Area (DWSMA) was also evaluated. Using geologic logs, the geologic sensitivity of each well was rated using a score ranging from very low to very high. The DWSMA is assigned a vulnerability ranging from low to moderate. The vulnerability assessment of each well is described in Table 4.1. City of Mounds View 24 Local Surface Water Management Plan Stantec Project No. 193804166 (i 5tantec