DEPARTMENT: Transportation
FILE TYPE: Consent Action
TITLE
title
Authorization To Execute Second Contract Amendment With Short Elliott Hendrickson Inc. For Continuing Final Design Services For County State Aid Highway 42 (145th Street) At Trunk Highway 52 Interchange Improvements In City Of Rosemount, County Project 42-174
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PURPOSE/ACTION REQUESTED
Authorize execution of the second contract amendment with Short Elliott Hendrickson Inc. (SEH) for final design services for County State Aid Highway (CSAH) 42 (145th Street) at Trunk Highway (TH) 52 Interchange Improvements, County Project (CP) 42-174.
SUMMARY
To promote a safe and efficient transportation system, Dakota County, the City of Rosemount, and the Minnesota Department of Transportation (MnDOT) are advancing CP 42-174 to improve the existing CSAH 42/TH 52 interchange (Attachment: Project Location Map). Planned improvements include ramp signalization, turn-lane additions, and geometric modifications to enhance safety and operations. Construction is scheduled for 2026.
By Resolution No. 24-384 (July 30, 2024), the Dakota County Board executed Contract DCA-21938 with SEH for preliminary and final design services.
By Administrative Change (December 2025), the County approved the first contract amendment to extend contract duration through December 31, 2027.
Need for Amendment
The original consultant scope did not include a complete geotechnical field investigation or preparation of a formal Materials Design Report (MDR). The intent at contract execution was to negotiate a separate amendment once the level of required geotechnical effort was better understood.
Through design development, the following additional tasks were identified as necessary:
1. Comprehensive geotechnical field investigation, including additional borings and pavement cores - $18,000.
2. Collection of soil and groundwater samples and associated laboratory testing - $21,825.
3. Evaluation of subsurface conditions related to paveme...
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