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August 18,2015 Paul Polzer,Public Works Director Page 5 of 7 Reference: Part 1 Wellhead Protection Plan Amendment, City of Centerville as required by MDH rules. Other coordinate projections can be provided to Centerville, if requested. Task 3: Vulnerability Assessments Once the WHPA and DWSMA delineations have been determined, the next step is to assess the vulnerability of the aquifers underlying these portions of land. We will review geologic data to determine how rapidly contaminants spilled at the surface might be expected to infiltrate to the aquifer of interest. Geologic layers such as clay and shale that might impede vertical infiltration of contaminants are inventoried to determine approximate travel times for contaminants to reach the aquifer(s). The shorter the travel time, the higher the vulnerability level is assigned to the aquifer. Aquifer vulnerability may vary over the area encompassed by the DWSMA. We will provide a map in the project report showing areas of high, moderate, and low vulnerability within the aquifer. The map will also be provided electronically as an ArcView shape file in UTM NAD 83 coordinates. Task 4: Reporting The project report will summarize the efforts undertaken above in Tasks 1-3. The report will serve as the main deliverable for the Part 1 Wellhead Protection Plan, documenting the data and methodology used to develop the WHPA/DWSMA delineations and aquifer vulnerability assessments. The report will also include all maps generated over the course of the project, both as paper printouts and in electronic ArcView formats. Additionally, any computer groundwater model input and output files will be provided electronically, along with supporting data sets that were used in the delineation process. Two paper copies and an electronic CD-ROM copy of the draft report will be submitted to Centerville for review. Upon approval by Centerville, we will submit the draft report to the MDH for their review and approval. Upon MDH approval, the final report will be presented to Centerville as both a Microsoft Word Document and an Adobe PDF document. Five paper copies of the approved report will be supplied,with additional copies available upon request. Task 5: Meetings We anticipate four meetings will occur over the course of the project. Three meetings will be used to update Centerville staff on the progress of the project. While most meetings will likely be held at Centerville offices, meetings may also be held via telephone if staff prefers this approach. D-sir witrn c,orrirr,un ty ill ruin" 25