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Title
Change Order/Amendment No. 9 in the net amount of $150,000 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.
On a Separate CIP approved project, The City has hired Halff Associates to remove the existing undersized storm drain culverts under Tarrant Road at Arbor Creek and replace them with larger culverts in order to adequately convey the flows in Arbor Creek during higher intensity rainfall events. As a result of these larger culverts, the road elevation will need to be raised approximately 5 to 6 feet, which necessitates the need for imported fill material. Meanwhile, the MacArthur project has a surplus of spoil material of good quality which is suitable for fill material,. In order to save significant costs on the Tarrant Road culvert project, the City is proposing to haul the excess spoils from the MacArthur project to a site adjacent to the Tarrant Road project and stockpile it for use on the Tarrant Road culvert project.
This proposed Change order/ Amendment No. 9 in the amount of $150,000 provides for the hauling of the material to the stockpile location adjacent to the Tarrant Road project site, installation of erosion control measures around the stockpile to keep the stockpile contained within its designated area, updating of the Storm Water Pollution Prevention Plan to include this stockpile site, and other miscellaneous items related to this work. The City received a price of $8 per cubic yard of material from Austin Bridge & Road to haul this material to the Tarrant Road site, which is substantially less than the $15 to $20 per cubic yard the City has received from contractor bids on previous projects for borrow material brought in from off-site, so the City anticipates a significant savings for the approximately 11,000 cubic yards of material to be hauled from the MacArthur site to the Tarrant Road site.
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.
Change order/ Amendment No.6 in the amount of $425,989.33 provided for additional quantities of the concrete retaining walls and bridge bents and other miscellaneous items work;
Change order/ Amendment No.7 in the amount of $38,745 provided for quantity overruns of Extra depth 48” drilled shafts at the bridge; it also provided for quantity underruns of 36” and 18” drilled shafts.
Change order/ Amendment No.8 in the net amount of $63,865.39 provided for additional rubble removal found during channel excavation and for quantity overruns of driveway pavement repairs including flex base and Asphalt transition; it also provides for quantity underruns of Sidewalk, hand rail and retaining wall at Forterra’s entrance.
The revised completion date for this project is March 19, 2018.
The total revised contract amount with approval of this change order/amendment will be $15,283,704.27.
Financial Consideration
Funding for the Change Order/Amendment No. 9 request for net $150,000. Cumulative amounts over $50,000 require City Council approval prior to execution. Funding of the $150,000 is available in the Street Capital Projects Fund (400192) WO#01205401-03 (Arbor Creek at Tarrant Rd STRT)