TO: Board of Supervisors
FROM: Steven Lederer, Director of Public Works
REPORT BY: Frank Lucido, Engineering Manager
SUBJECT: Approve Plans & Specifications, Award of Construction Contract, and Budget Transfer for the “Zinfandel Expedited Repair Project”, PW 24-23
RECOMMENDATION
title
Approve the Plans & Specifications for the Zinfandel Expedited Repair Project, PW 24-23; award a construction contract to Pomilia Civil of Redwood Valley, CA in the amount of $159,809 for the Project; and approve a Budget Amendment. (Fiscal Impact: $600,000 Expense; Capital Improvement Projects Fund; Not Budgeted; Discretionary)
[4/5 vote required]
body
BACKGROUND
On November 20, 2024, a 72-hour storm event started at Napa County that eventually caused two slides on Mount Veeder and significant scour to the roadway approach on the west side of Zinfandel Bridge (over the Napa River). Damage is estimated to be in the $6 to 7 million range for all the three sites. However, the situation is still evolving. Design and construction for the slides is expected to start in February of 2025 and construction completed by next winter. The work on Zinfandel Bridge needs to start sooner to prevent potential additional damage to the bridge. This design work for this Project is provided by ADKO Engineering who was previously selected through an RFQ process for potential emergency repairs such as these.
The historic stone arch Zinfandel Bridge over the Napa River was constructed in 1913. Since its original construction, the valley has experienced several major floods and changes to the channel and overbank. At some point a concrete wall was constructed adjacent to the southwest corner of the bridge to provide additional support to the roadway and in 2013 a major project was completed underneath the bridge to promote fish passage. Since the fish passage project, the bridge has been monitored and recently a scour near the concrete wall began to appear. On May 7, 2024, the Board approved $100,000 in funding for hydraulic modeling of the complex geometry and evaluating the site stability for potential alternatives if needed. Constructing a project in the Napa River near historic structures is rigorous, time consuming and typically requires a couple of years. Hydraulic modeling has been completed and the design team has been looking at project alternatives to stabilize the area near the Southwest wall that would minimize environmental impacts. The recent storm event caused the Napa River to experience significant flow and staff arranged for a geotechnical engineer to visit the site several times since then. Because of the level of scour and additional soil movement since the event, and the fact that Napa has historically seen severe floods in February and March, staff recommends that a repair be completed as soon as possible. This repair may become temporary or permanent depending on its long-term performance and later input from the permitting agencies. Staff has informed permitting agencies of this upcoming work and is using environmental documents from the previously completed fish passage project as a resource in developing the repair and minimizing impacts. Public Works advertised the Project (which consists of placing rock “rip rap” in a minimal area) on December 21, 2024 in accordance with Section 20150.8 of the Public Contract Code and on January 8, 2025 the following 16 bids were received:
Pomilia Civil, Redwood Valley, CA, $159,809
Granite Construction, Ukiah, CA, $186,475
Siteworks Construction, Lafayette, CA, $196,749
Rege Construction, Cloverdale, CA, $199,075
Maggiora& Ghilotti, San Rafael, CA, $200,400
Team Ghilotti, Petaluma, CA, $201,417
Suulutaaq, Suisun, CA, $207,778
Pridmore Construction, Napa, CA, $209,000
Ground Control, San Francisco, CA, $228,048
Gordon N. Ball, Walnut Creek, CA, $233,010
Granite Rock Company, San Jose, CA, $236,784
E.E. Gilbert Construction, Martinez, CA, $236,845
Coastside Concrete Construction, Santa Rosa, CA, $254,250
Pat Nelson Construction, Petaluma, CA, $281,700
Argonaut Construction, Petaluma, CA, $312,254
Valentine Corporation, San Rafael, CA, $419,369
Requested Actions:
1. Approve the Plans & Specifications for the Zinfandel Expedited Repair Project, RDS 24-23 (available at: https://www.countyofnapa.org/bids.aspx?bidID=455); and
2. Award the construction contract for the Zinfandel Expedited Repair Project, RDS 24-23 the Project to Pomilia Civil, of Redwood Valley, CA for their low base bid of $159,809 and authorize the Chair to sign the construction contract; and
3. Approve a Budget Amendment for the following (4/5 vote required):
a. Increase Transfer-Out appropriations by $600,000 in the Capital Improvement Projects Fund, (Fund 3000, Sub-Division 3000000, Account 56100) offset by use of its available fund balance to fund project 24030; and
b. Increase Construction Services appropriations by $450,000 in project 24030 (Fund 2040, Sub-Division 2040500, Project 24030, Account 52360) offset by a Transfer-In revenue from the Capital Improvement Projects Fund.
c. Increase Engineer Services appropriations by $150,000 in project 24030 (Fund 2040, Sub-Division 2040500, Project 24030, Account 52145) offset by a Transfer-In revenue from the Capital Improvement
FISCAL & STRATEGIC PLAN IMPACT
|
Is there a Fiscal Impact? |
Yes |
|
Is it currently budgeted? |
No |
|
Is it Mandatory or Discretionary? |
Discretionary |
|
Discretionary Justification: |
This repair is needed to prevent further damage and ensure public safety. |
|
Is the general fund affected? |
Yes |
|
Future fiscal impact: |
Funding will be needed in FY 24-25 for final design, permitting and construction. Permits may require mitigation planting and monitoring for up to 10 years after construction completion. |
|
Consequences if not approved: |
At least a portion of Zinfandel Lane could be lost along with potential damage to the historic bridge. This would result in a major disruption to traffic flow in the area. |
|
Additional Information |
None |
ENVIRONMENTAL IMPACT
ENVIRONMENTAL DETERMINATION: Consideration and possible adoption of a Categorical Exemption Class 1 and Statutory Exemption: It has been determined that this type of project does not have a significant effect on the environment and is exempt from the California Environmental Quality Act. [See “Emergency Projects” and Class 1 (“Existing Facilities”) which may be found in the guidelines for the implementation of the California Environmental Quality Act of 14 CCR §15269 & §15301; see also Napa County’s Local Procedures for Implementing the California Environmental Quality Act.]