Title
143rd Street Widening, CBBEL’s Contract Modification and Extension
History
On May 28, 2014, Christopher B. Burke Engineering, Ltd. (CBBEL) was awarded a contract to provide Phase I Engineering Services for 143rd Street widening for a total professional fee of $859,103. On June 25, 2017, the Village extended CBBEL’s contract (Supplement #1) for additional services in the amount of $249,968.
Since the approval of Supplement #1 in 2017, IDOT has come up with a new or modified design and engineering requirements resulting in additional scope of services that were not included in the original contract. Some examples of IDOT’s new or modified requirements include new traffic data, updated crash analysis, new rainfall data for drainage study, retaining wall design (which is typically done in Phase II), Intersection Design Studies, and environmental studies for historic homes and related public involvement activities. The Village then requested CBBEL develop a proposal for the additional scope of services to meet the new project requirements. The attached three documents, provided by CBBEL, outline the added scope of services, hours, and resulting professional fees. The following is a brief summary of scope items that need to be added in order to complete Phase I Engineering:
1. Traffic Data Collection and Analysis - In October 2018, CMAP adopted projected traffic volumes for 2050. The 143rd Street project is currently designed for projected 2040 traffic volumes. This effort will update the traffic study with the new traffic data.
2. Crash Analysis Report - Update the crash analysis for the most recent five-years (2013 - 2017). Previously, it was completed for 2012 - 2016.
3. Location Drainage Study - In March 2019, the Illinois State Water Survey (ISWS) released an update to Bulletin 70, which provides rainfall frequency data utilized in design of the roadway storm sewer system. This effort will address IDOT’s requested drainage design modifications by updat...
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