Change Order Nos. 10, 11, 12 - WWTP Secondary Treatment Improvements Proj No 114-053 - Thieneman Construction Inc

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INTER -OFFICE MEMORANDUM DEPARTMENT OF PUBLIC WORKS DIVISION OF UTILITIES TO: Members of the Board of Public Works Eric Horvath, Director of Public Works Michael Schmidt, Board of Public Works Attorney FROM: Al Greek, Director of Utilities Jacob M. Klosinski, Assistant City Engineer SUBJECT: Agenda Request Form — Change Order No. 12 Project No. 114-053: Wastewater Treatment Plant Secondary Treatment Improvements DATE: June 6, 2017 The Division of Utilities is requesting the Board of Public Works approval of Change Order No. 12 for Project No. 1144-053 Wastewater Treatment Plant Secondary Treatment Improvements. Refer to attached documents for supporting details for the subject work. Change Order No. 12 addresses the following changes: Demolition of Concrete Walkways Demolition of Containment Area at the south end of Aeration New Concrete Aeration Gallery Decking New Aeration Gallery Handrail to replace obsolete and damaged rails New Hatches for Aeration Gallery 1 Tunnel Access Access Step Modifications for Gallery #1, #2 and #3 (WWTP Buildings #8, #9, and #10) Concrete Coatings and Coating Touch-up Electrical Relocations for Lighting and Receptacles Concrete Slab -on -Grade at south end of Aeration 1 Secondary Treatment for Vehicle Access NET INCREASE FOR CHANGE ORDER NO. 12 ITEMS $483,411.00 Original Contract Sum $11,885,000.00 Net change by previously authorized change orders $ 1,615,234.87 The contract sum prior to this change order $13,500,234,87 By this change order, the project amount increases by $ 483,411.00 The new contract sum including this change order is $13,983,645.87 This Change Order represents a total change of +4.07% Total change for the entire project +17.66% Time Extensions resulting from Change Order No. 9: Substantial Completion: +30 days Final Completion: +30 days