TIC 2018-02-26 Item 2I - Contract Supplement #4 - Tukwila Urban Center Pedestrian-Bicycle Bridge with AKANA

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in City of Tukwila Allan Ekberg, Mayor Public Works Department - Henry Hash, Director INFORMATIONAL MEMORANDUM TO: Transportation and Infrastructure Committee FROM: Henry Hash, Public Works Director °,!, BY: Peter Lau, Senior Program Manager CC: Mayor Allan Ekberg DATE: February 23, 2018 SUBJECT: Tukwila Urban Center Pedestrian/Bicycle Bridge Project Project No. 90510403, Contract No. 16-092 Supplemental Agreement No. 4 with AKANA ISSUE Authorize the Mayor to execute Supplemental Agreement No. 4 to Consultant Contract No. 16-092 with AKANA in the amount of $180,448.00. BACKGROUND AKANA's Contract No. 16-092, with Supplemental Agreements 1 to 3, have been providing construction management (CM) services for the Tukwila Urban Center (TUC) Pedestrian/Bicycle Bridge Project. DISCUSSION The TUC Pedestrian/Bicycle Bridge Project has been delayed from physical completion due to delays from steel bridge and handrail fabrications, and some design inadequacies. Based on the construction contractor's latest projection, the construction work will likely be completed in April 2018. The consultant contract fund with AKANA was already used up in December 2017, because Supplemental Agreement No. 3 only allowed AKANA to provide CM services up to November 2017. In order to have continuous CM support from AKANA through the end of the construction project, Supplemental Agreement No. 4 is needed for their continuous services including closing out the project. FISCAL IMPACT The 15% construction contingency was $942,835.59 and will cover AKANA's Supplemental Agreement No. 4. There have been $57,946.50 in construction change orders to date, and AKANA's Supplement Nos. 2 and 3 for $251,169.00 were also drawn from this contingency. Supplemental Agreement No. 4 for $180,448.00 was carefully reviewed and is reasonable to close out this construction project. CM & CO Expenses 15% Contingency AKANA Supplement No. 3 $ 180,448.00 $942,835.59 AKANA Supplement Nos. 2 & 3 251,169.00 Change Orders No.1 to No. 6 57,946.50 Total: $489,563.50 $942,835.59 RECOMMENDATION Council is being asked to approve Supplemental Agreement No. 4 with AKANA in the amount of $180,448.00 for the TUC Pedestrian/Bicycle Bridge Project and consider this item on the Consent Agenda at the March 5, 2018 Regular Meeting. Attachments: AKANA's Supplemental Agreement No. 4 W:IPW EngIPROJECTSIA- RW 8, RS Projects\TUC Ped Bicycle Bridge (90510403)IConstructionW.100 - Contract Documents\CM Consultant\AKANAISup #41Info Memo for AKANA Sup #4, 2-12-18.docx 63