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Mr. Charlie Yunker October 10, 2024 Page 3 Task 3 – Contaminated Soil Disposal Management Based on previous investigation activities at the Site, it is expected that petroleum impacted soil will be encountered and require management during the UST removal activities. Per MPCA Guidance Document c-prp3-01, contaminated soil excavated for UST system removals should be returned to the excavation basin, except petroleum-saturated or grossly contaminated soil. For the purposes of this proposal, it is assumed up to 200 cubic yards of petroleum-saturated or grossly contaminated soil will be excavated and hauled off-Site for landfill disposal. WSB will provide oversight and management of contaminated soils during the excavation activities. Soils that meet the MPCA requirements for reuse as backfill will be segregated from contaminated soils requiring off-Site landfill disposal. WSB will coordinate with the landfill to obtain waste approval on behalf of the City and ensure waste manifests are assigned to each truckload of soil designated for disposal. Following the UST system removal activities, WSB will provide the City with daily field logs documenting the contaminated soil excavation activities and volume of soil hauled offsite to the landfill. Task 4 – MPCA Coordination WSB will coordinate with the MPCA prior to, and during the UST system removal activities. The MPCA will require notification if more than 200 cubic yards of petroleum-saturated or grossly contaminated soil will require off-Site landfill disposal. The MPCA may also require additional soil excavation and/or sampling based on the findings of the ongoing Site petroleum leak investigation (LS0021928). Task 5 – Petrofund Reimbursement Application Portions of the costs associated with the UST system removal and environmental oversight and sampling will be eligible for reimbursement via the Petroleum Tank Release Cleanup Fund (Petrofund). Following completion of the project, WSB will prepare the Petrofund reimbursement application for eligible costs associated with the management and disposal of petroleum contaminated soil during the UST system removal activities. Assumptions The following items are assumed for this Scope of Work: • It is assumed the total costs for the UST system and overhead canopy removal activities will not exceed $175,000; therefore, a public competitive bid advertisement will not be required. • The tank removal contractor will contract with the City directly for the UST system removal, overhead canopy removal, and Site restoration activities. • The vacant commercial building at the east side of the Site will not be disturbed. • Based on information obtained during the ongoing leak investigation, groundwater is anticipated to be present below 12 feet below grade at the Site. This proposal assumes groundwater dewatering will not be required to facilitate the tank removals. • WSB will contract an analytical testing firm for soil sample analysis. • The fuel dispensers have been previously removed from the site and no removal or disposal of fuel dispensers will be required. • Up to 14 total documentation soil samples will be collected following the UST system removal activities. Additional soil samples may be needed based on the size of the excavation basin. Additional samples beyond those listed under Task 2 will require additional fees. • Up to 200 cubic yards of petroleum-saturated or grossly contaminated soil will require special management and off-Site landfill disposal. • The UST system removal, overhead fueling canopy removal, and contaminated soil disposal activities will be completed in up to four working days. • The designated landfill will be selected by the UST removal contractor. Landfill disposal tickets will be billed to the UST removal contractor directly. 29