2019-03-27 CC Packet - Laserfiche WebLink

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PUBLIC INFORMATION MEETING CITY OF CENTERVILLE PART 1 WELLHEAD PROTECTION PLAN March 27, 2019 BACKGROUND: Wellhead protection is a means by which public water suppliers can protect the groundwater resources that supply drinking water to the community's wells. This is accomplished by identifying the capture zone of the wells and identifying any potential sources of contamination that may lie within that capture zone. A management plan is then established to help reduce the risks of contamination impacting the aquifer(s). Wellhead protection planning is a requirement that was established by the U.S. Environmental Protection Agency(EPA) as part of their amendment to the Safe Drinking Water Act in 1986.The EPA has left the individual states in charge of administering the wellhead protection program. In Minnesota, the program is administered by the Minnesota Department of Health (MDH), with the rules established and adopted in 1997.The MDH requires that all public water suppliers in Minnesota develop and implement a wellhead protection plan. The City of Centerville originally developed a Wellhead Protection Plan ten years ago. All public water suppliers are required to amend their plan every ten years to take into account changes with water usage, changes in land use, and changes with potential contamination sources.The amended plan must be completed by February 28, 2020. The Part 1 Wellhead Protection Plan contains the following elements: 1. The capture zones of the City's wells have been identified, using a computer groundwater model.These capture zones identify what portion of the aquifer(s) supply water to the City's wells over both a 1-year period and a 10-year period. 2. Using the capture zones generated by the model,the Drinking Water Supply Management Area (DWSMA) is defined using identifiable land surface features, such as roadways, parcel lines, and other land survey lines.The DWSMA is the area of land that the City will development a management plan for in the Part 2 process. 3. The vulnerability of the aquifer(s) underlying the DWSMA has been identified, using available geologic information. The DWSMA has been identified as having a "moderate" level of vulnerability to contamination. Geologic data shows that some protective layers exist between the land surface and the aquifer, but these protective units do not meet the required thickness to designate the aquifer as "low"vulnerability.The possibility exists that some contaminants could infiltrate through these protective layers. 20