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Title
Cottonwood Creek culvert improvements at Great Southwest Parkway, Marshall Drive and Robinson Contract Amendment/Change Order No. 5 to Engineering Professional Consultant Services contract with Halff Associates, Inc.in the amount of $139,744.00
Presenter
Romin Khavari, City Engineer
Recommended Action
Approve
Analysis
On May 26, 2015 a contract with Halff Associates, Inc. in the amount of $34,950 was awarded for the preliminary design for Cottonwood Creek drainage improvements along Great Southwest Parkway, Marshall Drive and Robinson Road in the Cottonwood Creek City-Wide Drainage Master Plan, re-evaluate design parameters, constraints and project feasibility elements based on current modeling updates and provide recommendations for improvements. Due to design issues related to the Marshall/Robinson sites, the Great Southwest location as separated and proposed for construction as part of another project.
Change Order/Amendment No. 1 approved on August 13, 2015 and Change Order/Amendment No. 2 approved on November 13, 2015 were for time extensions only.
Change Order/Amendment No. 3 was approved by City Council on August 2, 2016 in the amount of $264,280 to provide design plans and specifications for the recommended culvert improvements which included a 50-year design for South Fork Cottonwood Creek culvert improvements at Marshall Drive and Robinson Road as previously recommended in the Preliminary analysis Revising the total contract amount to $299,230. During design issues have come up with a TRA main that would have required extensive relocations and there were issues also related to obtaining the required easements.
Change Order/Amendment No. 4 was approved July 11, 2017 for a time extension only.
The current Proposed Change Order/Amendment No. 5 in the amount of $139,744 provides for the design of 100-year flood drainage improvements at Marshall Drive and Robinson Road crossing at the South Fork Cottonwood creek crossings a...
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