Agenda - Council - 10/08/2019 - Laserfiche WebLink

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As shown in Table C-1 , the eight Ramsey municipal wells pump from the Tunnel City-Wonewoc aquifer. Ramsey Wells 1 and 2 are located in the East DWSMA. Wells 3, 4, 5, 6, 7, and 8 are located in the West DWSMA. Well construction information for the City's municipal water supply wells wells is summarized in Table C-1 . Copies of the MDH Well Records for these wells are presented in Appendix A. Per the April 4, 2019 Scoping 2 Decision Notice (MDH, 2018), a map of the City's water supply system is not included in this Plan to avoid potential security threats to the system. C1.3.1 Pipelines As shown on Figure C-13 no petroleum or natural gas pipelines cross the Ramsey DWSMAs. There is one natural gas pipeline that ends approximately 0.5 miles east of the East DWSMA. This pipeline does not present a potential risk to the DWSMA. The closest approach of a petroleum pipeline to the DWSMAs is approximately 5 miles to the southwest of the West DWSMA. The petroleum pipeline does not present a potential risk to the DWSMAs. The City will rely on State/Federal oversight and the management programs of the pipeline owners for proper operation and maintenance of the pipelines and response to releases from the pipelines. Therefore, additional measures in this Plan to address releases are not necessary. C.1.3.2 Sewers C.1.3.2.1 Sanitary Sewers The City's sanitary sewer system is shown on Figure C-14. An improperly designed or maintained sanitary sewer system may increase the chance for the release of untreated sewage into environmentally sensitive areas such as protected wetlands, lakes, and rivers. It could also result in releases of untreated sewage that could infiltrate into the groundwater system. The depth to the source water aquifer in the DWSMAs is over 100 feet. The aquifer vulnerability in the DWSMAs is classified as Moderate, which indicates that it takes years to decades for water to reach the source water aquifer from the surface. Based on the available information, leaks from a the sewer system would likely pose no significant risk to the City's wells. Chapter 58 Article III Division 4 of the Ramsey City Code addresses sanitary sewer use and service. The City has an ongoing maintenance program to insure the integrity and proper operation of the sanitary sewer system. Additional measures in this Plan to address the sanitary sewers are considered to be unnecessary. C.1.3.2.2 Storm Sewers The City Code requires a stormwater management plan for all new developments. The City's storm sewer lines are shown on Figure C-15. A municipal storm sewer and surface water drainage system plays a significant role in the management of storm water and can be an important part of management strategies developed for a wellhead protection plan. An improperly designed or maintained storm sewer and surface water drainage system may increase the chance for the spread of a contaminant into environmentally sensitive areas such as protected wetlands, lakes, and rivers or allow infiltration of contaminants into the groundwater system. A surface C-7