4.2 SR 01-02-2024 - Laserfiche WebLink

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Rolling Hills Pond Dredging Ell< River, Minnesota S-5 Scope of Work The specifications, together with the plans, describe in detail the work to be completed on the project. The Contractor shall be responsible for all work and its proper completion except as explicitly noted. All work shall be completed in accordance with the pertinent federal, state, and local codes and ordinances. In addition to the construction, the Contractor shall protect, maintain, repair, and restore all subsurface and overhead structures directly or indirectly disturbed, damaged, or affected by his operation. The work under this project consists of excavation activities at six municipal stormwater ponds in Elk River, Minnesota. These municipal stormwater ponds are referenced as Rolling Hills Pond Dredging. Rolling Hills Pond Dredging encompasses an area of approximately 10,200 Square Feet at a depth of 2 feet, see site plan for reference. The Rolling Hills ponds have reached the limit of treatment effectiveness and requires maintenance. The sediment testing consisted of 12 composite samples at six different locations. The full assessment of sediment testing is attached as Rolling Hills Sediment Testing. B-1 is considered above Tier 1 SRV and would be classified as "regulated fill." Regulated fill is considered solid waste by the MPCA and required proper disposal. The five other basins are considered Tier 1 and is classified as "unregulated fill," which should follow the MPCA's Best Management Practices for Offsite Use of Unregulated Fill (MPCA BMP Guidance). According to their guidance, the MPCA recommends avoiding placing unregulated fill at schools, playgrounds, daycares, residential properties, in gardens where food will be produced, and near lakes, rivers or streams. The MPCA indicates that unregulated fill is best suited for use at industrial or commercial properties. If the Minnesota Pollution Control Agency SRV standards change during the timeline of the project that affects these standards, the city will retain the option to reconsider with the contractor and MPCA on an appropriate solution. The contractor will furnish all labor, equipment and materials to perform the requested excavation in accordance with the approved permit conditions. Contractor shall properly dewater the pond prior to excavation and may have to continue dewatering if groundwater is encountered during the project. The dredged sediment material must also be adequately dewatered prior to being hauled off site. The excavation shall include providing access for equipment from the banks of the pond, repairing the bank as can be accomplished during winter conditions, and excavating the pond until the native bottom is reached. The contractor shall be responsible for determining the best methods and equipment to use with a goal of maximizing the area of excavation. The contractor shall also be responsible for providing trucking of spoils to a suitable location selected by the contractor and allows for proper disposal. The contractor shall be responsible for compliance with all project permit conditions including, but not limited to, meeting all environmental standards. Division S S-2