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Title
Change Order/Amendment No. 6 in the net amount of $425,989.33 with Austin Bridge and Road, L.P. for MacArthur Paving and Drainage Improvements
Presenter
Romin Khavari, City Engineer
Recommended Action
Approve
Analysis
On April 21, 2015 the City of Grand Prairie (15-4571) awarded a construction contract to Austin Bridge and Road, L.P in the bid amount of $14,707,420.34 and a total project cost of $16,205,025 for MacArthur Blvd Paving and Drainage improvements between IH 30 and West fork of the Trinity River inside Irving City limits.
This project provided for the construction of 4,743 linear feet of 4-lane divided thoroughfare in MacArthur Blvd from IH-30 to north of the West fork of Trinity River to connect to the existing concrete roadway. The project also included the construction of Two-700 linear feet bridges over the Trinity River; 555 linear feet of 37’- wide new concrete roadway to the Land fill Road; construction of approximately 1400 linear feet of bypass channel across the existing Trinity River ox-bow to the west of MacArthur Blvd. to improve channel hydraulics and mitigate for the approximate 4 feet embankment fill required for the roadway.
This proposed Change order/ Amendment No.6 provides for quantity overruns of the concrete retaining walls and bridge bents; Although no changes were made in the construction drawings, plan quantities were not represented correctly by the engineer’s bid proposal, the City would have been responsible to pay for this project cost. This change order also provides for land fill road driveway, lay down curb installation and asphalt transition adjustments.
Change order/ Amendment No.1 approved by Council April 5, 2016 (16-5523) in the net negative amount of -$27,431.93 provided for revisions of bridge lighting conduit plans and the addition of an electrical service for bridge lighting on the north side of the Trinity river inside Irving City limits; Irving will take over Bridge maintenance following completion of construction; change order No.1 also provided for additional storm drain pipe to convey storm water from a low spot area inlet on Forterra plant site and other miscellaneous adjustments.
Change order/ Amendment No.2 in the amount of $49,869.19 provided for the under cutting and removal of unsuitable bedding material encountered during storm drain construction and replacing it with clean density controlled compacted fill; it also provided for installation of concrete safety barriers.
Change order/ Amendment No.3 approved by Council August 16, 2016 (16-5917) in the amount of $54,640.51 provided for the decorative painting of proposed concrete bridge rails, additional temporary HMAC pavement for a driveway approach access from the landfill road to an adjacent property to the north and the installation of a 2” HDPE water service; it also provides for reductions and adjustments of miscellaneous contract quantity items.
Change order/ Amendment No.4 in the amount of $4,314.94 provided for Landfill gate relocation and Tree removal.
Change order/ Amendment No.5 in the amount of $5,036.50 provided for off -duty officers furnished by contractor to direct traffic during MacArthur closures through detours at IH-30 and Hunter Ferrell Road.
The revised completion date for this project is February 17, 2018.
The total revised contract amount with approval of this change order/amendment will be $15,219,838.87.
Financial Consideration
Funding for the Change Order/Amendment No. 6 request for net $425,989.33 consists of $449,708.17 in increases and $23,718.84 in decreases for a cumulative total of $473,427.01. Cumulative amounts over $50,000 require City Council approval prior to execution. Funding of the $425,989.33 is available in the Grant Fund (300596) 36509015 (MacArthur Blvd) Contract C15107 Contingency 68540. With the approval of this change order it will leave a balance of $222,952.46 remaining in the approved contingencies for the project for future use if neccessary.