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Mr. Charlie Yunker October 10, 2024 Page 2 • Removal, management, and disposal of the UST system (tanks and product piping) • Removal and management of any liquids, sludge, and/or solids remaining in the tanks • Cleaning of the USTs prior to removal and disposal • Removal and management of petroleum impacted soil • Public and private utility locates and the disconnection of any required public and private utilities prior to demolition/removal. • Permit and notification responsibilities prior to demolition/removal. • Restoration of Site, including backfill. • Bid form with costs broken down by: o Removal and disposal of the overhead canopy o Removal and disposal of the UST system o Removal, loading, hauling and disposal of petroleum impacted soil o Procurement of clean backfill material and backfilling and compaction of fill within the tank excavation area o Site restoration WSB will summarize the provided UST system and overhead canopy removal bids in a letter to the City and recommend a contractor based on the lowest responsible bid meeting the criteria outlined in the quotation package. WSB will also assist with contract execution prior to initiation of fieldwork activities. Task 2 – UST System Removal Oversight, Soil Sampling and Documentation WSB will coordinate with the City and the UST removal contractor to ensure removal and restoration activities are performed on schedule and in accordance with local, state, and federal guidelines. WSB will also communicate with the contractor to obtain documentation for final reporting purposes. WSB will provide notification to the MPCA through their e-Services database for the sampling and documentation activities. WSB will provide oversight during the UST system and overhead canopy removal and conduct soil sampling and screening per MPCA Guidance Document c-prp3-01, Excavation of Petroleum- Contaminated Soil and Tank Removal Sampling (May 2024) and other applicable MPCA Guidance documents. WSB will screen soils with a photoionization detector (PID) during the UST removal activities to document and manage contamination. WSB will collect up to 14 total soil samples for laboratory analysis following the UST system removal for documentation purposes per MPCA guidelines. It is assumed that four sidewall (one from each side), six bottom (one from below each end of the three tanks), and four dispenser (one from below each former dispenser island) soil samples will be collected from the excavation basin for laboratory analysis. Additional samples will be collected as needed for soil screening and documentation purposes. The 14 soil samples will be submitted for laboratory analysis of: • Gasoline range organics (GRO) by the Wisconsin Modified Method • Volatile organic compounds (VOCs) by EPA Method 8260D One trip blank will also be submitted to the laboratory for GRO and VOC analysis for quality assurance/quality control (QA/QC) purposes. Upon receipt of the laboratory analytical results, an excavation report will be prepared and submitted to the MPCA summarizing the excavation of the UST system and soil sampling results according to MPCA Guidance Document c-prp3-02, General Excavation Report Worksheet (July 2022). It is anticipated that the fuel island canopy will be removed along with the UST system. WSB’s Asbestos and Regulated Materials (ARM) Assessment completed at the Site in Winter 2022/2023 did not identify any asbestos or regulated materials requiring abatement/removal prior to the canopy demolition. A final walkthrough will be completed following the UST system and overhead canopy removal to ensure the Site has been properly backfilled, graded and restored according to the bid specifications. 28