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Item 4EItem 4E M E M O R A N D U M (October 16, 2018) To: Shana Yelverton, City Manager From: Rob Cohen, Director of Public Works Subject: Approve Change Order No. 2 with NG Painting, LP for the installation of diffuser structures, floor repairs and painting for the Pearson 5 MG Ground Storage Tank #1 and the T.W. King 5 MG Ground Storage Tank in an amount not to exceed $90,000. Action Requested: Approve Change Order No. 2 with NG Painting, LP for the installation of diffuser structures, floor repairs and painting for the Pearson 5 MG Ground Storage Tank #1 and the T.W. King 5 MG Ground Storage Tank in an amount not to exceed $90,000. Background Information: City Council awarded a construction contract with NG Painting, LP to refurbish and repaint the Pearson Ground Storage Tank #2 back in January of this year. During this project, as part of our annual tank inspection and cleaning efforts, we discovered damage to the floors of the Pearson 5 MG Ground Storage Tank #1 and the T.W. King 5 MG Ground Storage Tank. One of the methods staff utilizes to maintain the highest possible water quality is the deep cycling of our tanks, resulting in the accelerated deterioration of the tank floor directly beneath the intakes. In an effort to preserve the life of the floor coating and materials within the Pearson Ground Storage Tank #2, staff worked with our design consultant to develop a diffuser to decrease the water velocity, preventing the premature deterioration of the tank floors. This additional work was paid for from the construction contingency included in the original construction contract. In addition, while NG Painting was on site, we elected to have the roof hatch installed in Pearson Ground Storage Tank #2. This hatch was necessary for the installation of the tank mixer while the tank was out of service. Change Order No.1 was for the addition of a diffuser and hatch to Pearson Ground Storage Tank #2 and roof hatches for Pearson Ground Storage Tank #1 and the T.W. King Ground Storage Tank. NG Painting will be returning when peak water demand is less to install the hatches on the remaining two ground storage tanks. Item 4E The original construction contract amount awarded to NG Painting, LP was for $1,221,000 and Change Order No. 1 added $24,000 to the contract to install the roof hatches at Pearson Ground Storage Tank #1 and the T.W. King Ground Storage Tank which were funded from the tank mixer CIP project. Financial Considerations: Funding for the improvements to the Pearson Tanks has been allocated in the Utility Fund as part of the FY 2016 and FY 2018 Capital Improvement Program Budgets. Strategic Link: The addition of diffusers, floor repairs and painting of these facilities links to the City’s strategy map relative to the focus areas of Safety and Security and Infrastructure. The specific corporate objectives that are met by this construction project are to (C1) Achieve the highest standards of safety & security and (F2) Invest to provide & maintain high quality public assets. Citizen Input/ Board Review: N/A Legal Review: N/A Alternatives: The City Council may approve or deny this change order. Supporting Documents: Executed Construction Contract Change Order No. 2 Staff Recommendation: Approve Change Order No. 2 with NG Painting, LP for the installation of diffuser structures, floor repairs and painting for the Pearson 5 MG Ground Storage Tank #1 and the T.W. King 5 MG Ground Storage Tank in an amount not to exceed $90,000. Staff Contact: Rob Cohen, Director of Public Works Kyle D. Hogue, P.E., Deputy Director/City Engineer Project:Refurbishing and Repainting of Pearson Ground Storage Tank #2 Owner:City of Southlake Contract:Contract Date: To:NG Painting, LP Contractor Nature of changes: Addition of diffusers to Pearson #1 and T.W. King Item Qty Unit Unit Price Total 4. ADD 1 LS 41,000.00$ 41,000.00$ 5. ADD 1 LS 41,000.00$ 41,000.00$ Total Change Order:82,000.00$ These changes result in the following adjustment of contract price and contract time: Contract Price Prior to this Change Order Net Increase Resulting from this Change Order Current Contract Price Including this Change Order The above changes are approved: By: Title: Date: City of Southlake City Mayor Install inlet diffuser System at T.W. King Ground Storage Tank including floor repair by surface preparation and repainting of 20'X20' area CHANGE ORDER No. 2 Date: October 16, 2018 $1,221,000.00 You are directed to make the changes noted below in the subject contract for the dollar amount stated below including all labor, equipment, materials, overhead, and profit: $1,245,000.00 $82,000.00 January 16, 2018 Install inlet diffuser System at Pearson Tank #1 including floor repair by surface preparation and repainting of 20'X20' area $1,327,000.00 Description 1 of 2 Change Order No. 2 Contract Time Prior to this Change Net Increase Resulting from this Change Order Current Contract Time Including this Change Order The above changes are recommended: By: Title: Date: City By: By: Title: City Engineer Title: Date:Date: Contractor By: Date: Director of Public Works (Days or Date) City of Southlake City Project Manager City of Southlake City City of Southlake December 1, 2018 (Days) 30 calendar days (Days or Date) 180 calendar days 2 of 2