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HomeMy WebLinkAbout04.a. Presentation (Handout)Item 4.a. (Handout) Attachment 1 Construction Projects Summary 1. Aeration Basins Diffuser Replacement— 2. Pump Station Upgrades— Phase 2A, Phase 1, District Project (DP) 100019: DP 8457: General Contractor — C. Overaa & Co. Notice to Proceed —Aug. 28, 2023 Estimated Completion Date — Dec. 24, 2025 Time Spent — 28% Contract Award - $12,662,000 Contract Spent — $1,599,000 (12.6%) Change Orders to Date — $57,000 (-0.0%) Contingency - $1,717,000 General Contractor — C. Overaa & Co. Notice to Proceed — Nov. 16, 2022 Estimated Completion Date — Oct. 31, 2025 Time Spent — 44% Contract Award - $27,606,000 Contract Spent — $12,183,500 (44%) Change Orders to Date — $0 (0.0%) Contingency - $2,761,000 1. Aeration Basins Project Demolition of the concrete plenums has begun, the air leaks in the floor of the tank need to be addressed prior to pouring new concrete (floor and baffle walls). 1 1. Aeration Basins Project - Continued Bid item for sealing leaks in the contract, however, staff is negotiating increased bid quantity to cover the extensive air leaks. $200,000 Work Directive issued to avoid delays. Based on this effort, a request to the Board will be made to cover the next basin scheduled for May of 2025. 2 2. Pump Stations Upgrades - Phase 2A Maltby 5 2. Maltby Extra Work - DTS C Department of Toxic Substances Control (DTSC) permit being managed with the project by Regulatory Compliance Group. Allowance was added into the bid for $500,000 to mitigate, remove, or include improvements related to the permit and contaminated soils. GHD, Inc. hired to help project for air monitoring and provide engineering and technical assistance. Excavations and work to date have been very successful. Capital Projects using the allowance to remove the remaining 5 feet of soils and install barrier at a cost of roughly $287,000 to prevent future permitting requirements including monitoring. No Board action required since the work was anticipated in the contract. 3 3. Other Projects and items (New Slide) Solids Handling Facility Improvements Phase 1A: Contractor staging needs to be expanded. Staff is exploring the possibility to use the Surcharge pile next to the Contractor Staging yard as an expanded area for the Solids Project and others. Current estimate is approximately $420,000. A design change was issued based on the electrical and controls field investigation work and issued to Overaa last week. Costs and impacts —TBD. Martinez Urgent Forcemain Replacement: The UPRR permit requires the use of a certified and federal approved service, Rail Pros, to assist public agencies to help achieve and implement a successful project. Service include engineering controls, traffic plans, contractor orientation, inspection and more. These costs are anticipated to be high and considered a reimbursable expense to the District contractor. Costs - TBD. M