File #: 2021-0119   
Type: Consent Calendar Item Status: Agenda Ready
File created: 2/3/2021 In control: Transportation and Public Works
On agenda: 3/23/2021 Final action:
Title: Contingency adjustment to 2020 Pavement Preservation Program - Full-Depth Reclamation and Overlays Project - Construction Contract C20101.
Department or Agency Name(s): Transportation and Public Works
Attachments: 1. Summary Report, 2. Location Map

 To: Board of Supervisors

Department or Agency Name(s): Transportation and Public Works

Staff Name and Phone Number: Johannes J. Hoevertsz 707-565-2231

Vote Requirement: Majority

Supervisorial District(s): 1,2,4,5




Contingency adjustment to 2020 Pavement Preservation Program - Full-Depth Reclamation and Overlays Project - Construction Contract C20101.



Recommended Action:

Recommended action

Approve a $135,000 increase to the construction contract contingency amount for the 2020 Pavement Preservation Program - Full-Depth Reclamation and Overlays Project due to changes in the scope of work and material quantities resulting from unforeseen circumstances.



Executive Summary:

The Department of Transportation and Public Works (TPW) is requesting that the Board approve an increase to the contingency for the 2020 Pavement Preservation Program (PPP) - Full-Depth Reclamation and Overlays Project in the amount of $135,000.



On May 19, 2020, the Board awarded the 2020 PPP - Full-Depth Reclamation and Overlays construction contract to Ghilotti Bros., Inc. The original scope of work for this contract included capital improvements to the following:

                     Bohemian Highway                      Burnside Rd to Bodega Hwy                                                               2.13 miles

                     Center Street                                          Arnold Dr to Bay St                                                                                    0.25 miles

                     Grange Road                                          Guenza/Peracca Rd to Bennett Valley Rd                     1.32 miles

                     Grove Street                                          Arnold Dr to Riverside Dr                                                               0.37 miles

                     Linden Street                                          Petaluma Ave to Verano Ave                                                               0.67 miles

                     Riebli Road                                          P.M. 10.97 to Hidden Hills Dr                                                               0.65 miles

                     Solano Avenue                     Arnold Dr to Riverside Dr                                                               0.47 miles

                     Tomales Road                                          Marin Co. Line to Valley Ford Rd                                          1.69 miles

                     Arnold Drive                                          Hwy 116 to Arnold Dr                                                                                    0.20 miles

                     Bohemian Highway                     Bodega Hwy to Bittner Rd                                                               3.68 miles

                     East Cotati Avenue                     Rohnert Park City Limits to Petaluma Hill Rd                     0.51 miles

                     Lark Center Drive                     End to Old Redwood Hwy                                                               0.25 miles

                     Moorland Avenue                     Todd Rd to Bellevue Ave                                                               1.02 miles

                     Todd Road                                          Stony Point Rd to Hwy 101 Ramps                                          1.69 miles

                     Lavell Road                                          Old Redwood Hwy to Mayfield Dr                                          0.32 miles

During construction several items of work increased or changed due to previously unforeseen circumstances. On Tomales Road, the existing concrete road section was found in conflict with the reclamation work which resulted in delays and a surface treatment change to one mile of roadway. On Todd Road, Caltrans requested extension of the paving limits to include the signalized area at the Highway 101 off ramp which is the County’s maintenance responsibility. This change increased the work on Todd Road by approximately 15%. Other work added to the contract also included: soil testing for disposal purposes, changes in the road surface repairs on Bohemian Highway prior to paving, testing and stabilization of the full-depth reclamation surface prior to paving, and significant drainage enhancements on Barnett Valley Road, Bohemian Highway, and in the El Verano area.

Five contract change orders within TPW’s delegated change order authority for this contract will be executed to cover these changes. However, when combined with increases to the bid item quantities allowed by the contract, the 10% contingency budget has been exhausted. Therefore, TPW is requesting Board action to increase the contingency budget and cover the additional cost.


Prior Board Actions:

5/19/2020: Board approved 2020 Pavement Preservation Program - Full-Depth Reclamation and Overlays Project, C20101, for 14.87 miles of roadway

5/21/2019: Board approved 2-year Pavement Preservation Program for 2020


Fiscal Summary


FY 20-21 Adopted

FY21-22 Projected

FY 22-23 Projected

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Narrative Explanation of Fiscal Impacts:

There are sufficient appropriations for this contingency amount in the FY 2020-21 recommended Road Capital budget. Road Capital receives funding from multiple sources including allocations from the State Highway Users Tax, SB1, and contributions from the County’s General Fund. General Fund contributions earmarked for Pavement Preservation Projects are divided between the Road Maintenance and Capital Improvement departments based on the type of work being performed. The Department’s recommended budget includes $5,252,890 in SB1 revenue and $13,659,872 in County contributions (General Fund, Franchise Fees, Measure L, ARM Mitigation) which are available for the PPP.


Staffing Impacts:




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Narrative Explanation of Staffing Impacts (If Required):




Location Map


Related Items “On File” with the Clerk of the Board: