STAFF REPORT TO THE CITY COUNCIL
DATE: Regular Meeting of June 23, 2026
TO: Mayor and Members of the City Council
VIA: Patrick Tang, Interim City Manager
SUBMITTED BY: Chris Morris, Acting Public Works Director SUBJECT: Acceptance of the Bay Trail Soil Nail Wall Sinkhole Repair Project RECOMMENDED ACTION:
Adopt a resolution accepting the Bay Trail Soil Nail Wall Sinkhole Repair Project contract with E.E. Gilbert Construction, Inc. as complete for a total amount of $92,456.60 and authorize the filing of the Notice of Completion with the Contra Costa County Recorder’s Office.
BACKGROUND:
The Bay Trail Soil Nail Wall Sinkhole Repair Project (Project) was awarded at the September 9, 2025, City Council meeting to E.E. Gilbert Construction, Inc. (E.E. Gilbert) for the low bid amount of $77,505.60 with provisions for a 10 percent contingency of up to $7,751.00 for a total authorized expenditure amount of $85,256.60. Commencement of work was postponed over the winter to avoid saturated conditions and Notice to Proceed was issued to E.E. Gilbert on April 13, 2026. The primary scope of work consisted of mobilization, erosion control, grading work, removal and installation of concrete valley gutter/trench and installation of flowable fill material.
ANALYSIS:
E.E. Gilbert commenced work on the Project on April 13, 2026 and completed all work on May 22, 2026. Two change orders were issued on the project. An additive change order was issued for $3,186.00 for a third lift of flowable fill not foreseen as necessary in the original contract documents. A second change order for $11,765.00 was issued to fill a second sinkhole cavity discovered approximately 200 feet to the north of the project site. Although the second change order exceeded the contingency allowance, the additional work was deemed necessary to prevent expansion of the second sinkhole cavity and potential further damage to the soil nail wall.
E.E. Gilbert has completed all work on the Project in accordance with the plans, specifications and change orders and to the satisfaction of the City Engineer. The final cost to complete the project was $92,456.60 (19.3% more than the original Contract Price).
It is recommended the Bay Trail Soil Nail Wall Sinkhole Repair Project be accepted at this time so the Notice of Completion can be filed with the Contra Costa County Recorder’s Office to allow final payment to be made to the contractor.
FISCAL IMPACT:
This Project was identified in the 2025 Capital Improvement Program and was included in the adopted FY 25-26 Budget. Funding for this project has been allocated from the General Fund/Capital Reserves, SB1 RMRA and Solid Waste funds.
ATTACHMENTS:
Attach 1- Resolution
Attach 2- Notice of Completion
Attach 3- Project Location Map