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Spheros Environmental | www.spherosenv.com | Page 5 Task 5: Assess Well Field and DWSMA Vulnerability Spheros will assist with the vulnerability assessment within the DWSMA in accordance with MR 4720.5210. The assessment will follow the MDH’s guidance document, Assessing Well and Aquifer Vulnerability for Wellhead Protection. The assessments will include a review of well construction details to evaluate individual well vulnerability. Spheros will evaluate data from the above tasks to assess the vulnerability of the target aquifers underlying the DWSMA. This will include review of geologic logs, cross sections and maps, and existing groundwater chemistry and any isotopic data. Task 6: Complete Report Following completion of the above tasks, Spheros will prepare a draft report. The report will include the conceptual hydrogeologic model, model input and the results used to delineate the WHPAs, DWSMA, and well and aquifer vulnerability assessments. After review of the draft, a final report will be prepared which incorporates comments received from WSB, the City, and MDH staff. Supporting data files that are Project-specific and define aquifer characteristics used in the model will be delivered in ArcGIS format. Task 7: Attend Project Meetings (Virtually) Spheros is assuming three meetings total with two meetings being required by MDH: one for the required pre-delineation meeting with the MDH hydrologist; the second will be an interim meeting with Spheros and the MDH to discuss the modeling results and determine if it meets MDH’s expectations. If other meetings are necessary during the Project, Spheros will notify WSB. Spheros assumes the meetings with MDH will be held virtually. Costs also include attending one City Council meeting (virtually) at the end of the Part 1 Project, if needed. 2. TIME REQUIRED Upon receiving authorization, Spheros will initiate the Scope of Services, with an expected completion timeframe of 8 to 10 months from the notice to proceed. Delays caused by major changes in the project plans or by circumstances beyond the control of Spheros could extend the time of completion. This will allow for over half of the Project timeline ahead of the March 2029 deadline for completion of Parts 1 and 2.