TO: Board of Supervisors
FROM: Steve Lederer, Director of Public Works
REPORT BY: Liang Chin Su, Associate Engineer
SUBJECT: Project Creation, Approval of Professional Services Agreement with ADKO Engineering Inc., and Budget Amendment for the Kortum Canyon Road Slide Repair, RDS 26-48
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RECOMMENDATION
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Approve and authorize the creation of Project 27022 for the “Kortum Canyon Road Slide Repair, RDS 26-48”; Agreement No. 270225B for a contract maximum of $199,331 with ADKO Engineering Inc.; and approve a Budget Amendment. (Fiscal Impact: $229,331 Expense for the design contract and other project costs; General Fund; Reallocation of Budget; Discretionary)
[4/5 vote required]
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BACKGROUND
Following the storm event that started in November of 2025, County staff and consultants completed a comprehensive review of conditions along various County roads. Approximately 120 feet of road on Kortum Canyon Road was observed to show creep affecting fill slope at the edge of pavement, causing cracking, settlements, and damage to the downhill side.
Based on the observed cracking and measured movement, the consultant estimated that continued slope movement could reduce the usable roadway width to approximately 9 to 10 feet and create a steep drop-off at the pavement edge. The roadway repair has been identified as a high-priority project due to the potential for continued movement to render the roadway impassable with no alternative route on Kortum Canyon Road.
Through a qualifications based process, the County selected ADKO Engineering, Inc. (ADKO), as the most qualified firm for the design and other supporting specialized services needed to complete the type of repair based suited for this site. Staff recommends approval of the Professional Services Agreement for $199,331 with ADKO for their engineering services.
After reviewing subsurface conditions, it was determined the most cost-effective method to repair the roadway is to slope “trimming” the uphill side to wi...
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