2015-09-23 CC Packet - Laserfiche WebLink

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5ta ntec August 18,2015 Attention: Paul Palzer, Public Works Director City of Centerville 2085 West Cedar Street Centerville, MN 55038 Dear Mr. Palzer, Reference: Part 1 Wellhead Protection Plan Amendment, City of Centerville This letter outlines a scope and budget to complete the amendment to your Part 1 Wellhead Protection Plan. The scope of services is based on our understanding of Centerville's original Wellhead Protection Plan and the information provided by the MDH during the August 18, 2015 scoping meeting. Wellhead Protection Plannina The City of Centerville is currently in the process of amending its existing Wellhead Protection Plan to bring the plan up to date before it expires.The wellhead protection plan has a 10-year lifespan, meaning that once it has been approved, it must be updated before the 10-year lifespan is over or whenever the City adds a new water supply well,whichever comes first. The Part 1 Wellhead Protection Plan includes a delineation of the wellhead protection capture zone for the City's water supply wells, along with a delineation of the drinking water supply management area (DWSMA), which is an expression of the capture zone using overlying land parcels and roadways as boundary lines. The capture zone is determined by using a computer groundwater model to simulate flow within the aquifer(s) and determining the properties of the aquifer itself, such as conductivity, porosity, flow boundaries, and recharge. The Part 1 Wellhead Protection Plan also identifies the vulnerability of the wells and the vulnerability of the aquifer supplying them. The aquifer's vulnerability to contamination can range across the DWSMA, depending on the amount of geologic protection overlying the aquifer(s). The following tasks will comprise the amendment of Centerville's Part 1 Wellhead Protection Plan. r rrmlr,: 21