CC MEETING: December 3, 2024
DATE: November 18, 2024
TO: Erin Rinehart, City Manager
FROM: Jonathan Wheat, P.E., Director of Engineering
Shannon Hicks, Assistant City Manager
Title
Consider A Resolution Authorizing The City Manager To Negotiate And Execute Contract Change Amendment No. 3 With HDR Engineering, Inc. For The Dudley Branch Channel Improvements Project In An Amount Not To Exceed $45,000 For A Revised Contract Amount Not To Exceed $593,949.00.
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BACKGROUND:
The City of Carrollton has an existing contract with HDR Engineering, Inc. for the evaluation and drainage improvements recommendations for Dudley Branch Channel Improvements. The existing design contract with HDR was approved by council on Match 6th, 2018.
Contract amendments No. 1 and No. 2 provided for alternative analysis of flood alleviation strategies of the Lower Dudley Branch.
HDR Engineering Inc is currently under contract with the City of Carrollton to perform a flood study for Dudley Branch between Taos Pond and the DART railroad tracks which includes an evaluation of flood mitigation options focusing on Indian Creek Drive and inundation on Frankford Road. This proposed Change Amendment No. 3 would be to determine if the Dudley Branch culvert crossing at Eisenhower Street are sized sufficiently, as well as identify the impact of the Elm Fork backwater through this area. This site is a critical location along the Dudley Branch Channel as all upstream flows pass through the culverts, and the culverts are near several residential neighborhoods. Evaluating the performance of the Eisenhower culverts for the 5-, 10-, 25- and 100-year storm events will determine if any future drainage improvements are needed at that location.
FINANCIAL IMPLICATIONS:
This change amendment consists of an additional $45,000.00 which increases the current contract from $548,949.00 to $593,949.00, a total 52.3% increase from the original contract amount of $390,000.000. Funding for the additional quantity is available in Account 854560, Drainage Consolidated funds.
IMPACT ON COMMUNITY SUSTAINABILITY:
Performing the necessary drainage study to determine the effects of hydraulic modifications to the Eisenhower Street Culvert will help determine the effects of various strategies that can be utilized to mitigate flooding and possible overtopping at the Eisenhower Street Culvert. By mitigating flooding, the city demonstrates that it places the lives and property of residents and businesses as the highest priority, and that the city is flexible and amenable to undertake the necessary measures to improve the quality of life for all residents in the City of Carrollton.
STAFF RECOMMENDATION/ACTION DESIRED:
Staff recommends authorizing Change Amendment No. 3 for the Dudley Branch Channel Improvements in an amount not to exceed $45,000.00, for a revised contract amount not to exceed $593,949.00.