Agenda - Public Works Committee - 09/17/2019

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1.0Introduction 1.1Background The City of Ramsey (City) currently operates seven primary municipal water supply wells: Wells 1, 3, 4, 6, 7, and 8. Well 2 is used seasonally, as needed, during high demand periods. These wells pump from the Tunnel City Group-WonewocSandstone aquifer. Minnesota unique well number along with well construction, status, aquifer, and well vulnerability classification for each of Ramsey supply wells is presented in Table 1. Well locations and Drinking Water Supply Management Area (DWSMA) locations are shown on Figure 1. Minnesota Department of Health (MDH) well records for all the Ramsey municipal wells are presented in Appendix A. The previous Ramsey Wellhead Protection Plan (WHPP) Parts 1 and 2 were prepared in 2008 and 2009, respectively. The MDH issued final approval of the previous Part 2 WHPP in 2010. In accordance with the Minnesota Wellhead Protection Rules (Minnesota Rules 4720.5100 through 4720.5590), amendment of WHPP was initiated based on the age of the Plan. The Part 1 WHPP amendment (MDH, 2018) was approved by the Minnesota Department of Health (MDH) in January 2019 (MDH, 2019a). A public information meeting on the Part 1 WHPP amendment was held on March 19, 2019. In the Part 1 WHPP amendment, two separate DWSMAs were delineated for Ramsey that encompassed the wellhead protection areas (WHPAs) for the Ramsey water supply wells. In addition to the delineation of the WHPAs and the DWSMAs, Part 1 of the WHPP amendment includes an assessment of the vulnerability to contamination of the Ramsey municipal wells and the source water aquifers in the associated DWSMAs. In accordance with Minnesota Rules 4720.5550, Wells 1, 2, 3, 4, 5, and 8 are classified as vulnerable to contamination from the surface and Wells 6, and 7 are classified as not vulnerable (see Table 1). In the Part 1 amendment report, the vulnerability to contamination of the uppermost source water aquifer within the DWSMAs was identified as Moderate (MDH, 2018). Figure 1 shows the aquifer vulnerability in the Ramsey DWSMAs. The RamseyPart 1 WHPP amendment is presented in Appendix B. 1.2Description of the Public Water Supply System The City is located in Anoka County. Ramsey currently has seven primary water supply wells and one seasonal-use wells in the municipal water supply and distribution system for Public Water Supply #1020035. Locations of the wells are shown on Figure 1 and general construction details for the Ramsey municipal wells are summarized in Table 1. Copies of the MDH well records for the Ramseymunicipal wells are presented in Appendix A The 2010 census indicated that Ramsey had a population of 23,668. In 2017 the estimated population was 25,581 and the estimated population served by the municipal water supply system was 13,720 (Ramsey, 2018a). The Metropolitan Councilpreliminary estimate of the 2018 population of Ramsey is 27,051. The lan (Ramsey, 2018a) projects that water supply 4 4