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June 5, 2019 Mark Statz Page 2 of 5 Reference: Part 2 Wellhead Protection Plan Proposal, City of Centerville Centerville’s Drinking Water Supply Management Area (DWSMA) has a moderate level of vulnerability. In moderate vulnerability areas, potential sources of contamination that must be accounted for includes other groundwater wells, storage tanks, shallow disposal wells, and other point sources with a capacity to release a large concentration of contamination. The State maintains rough databases of several potential contamination sources. These will be used as a starting point for developing the PCSI. Steps to complete the inventory include: Any potential sources of contamination will need to be verified, to account for any changes that may have occurred since the State originally cataloged them. New potential sources of contamination may have been introduced to the DWSMA that the State’s inventory doesn’t account for. Likewise, existing potential sources of contamination may have never been accounted for by the State. These will need to be identified. Accurate location information or site status is often not available from the State. The PCSI should attempt to refine this information as much as is practical, to ensure the final inventory is a good representation of what lies within the DWSMA. As part of a previous MDH implementation grant Stantec assisted the City of Centerville with, a preliminary inventory of wells and tanks was completed. This inventory will be updated with any additional available information and incorporated with any other potential contamination sources to be inventoried. Further data elements that will be required to be included in the plan are maps of the following: 1. An existing comprehensive land use map. 2. An existing zoning map. 3. A map of oil and gas pipelines. For the scope of this work plan it is assumed that Centerville can provide the above for the portion of the DWSMA that falls inside the City limits. For the portion of the DWSMA that falls outside of Centerville, it is assumed that the City will assist Stantec in obtain these maps for surrounding cities. 2. Development of Management Plan The management plan comprises the heart of the Part 2 Wellhead Protection Plan. The management plan identifies changes to the water supply system, changes to area land use, problems and opportunities in 46