2021 Four Lagging Walls Construction Project: Dry Creek Rd. and Diamond Mtn. Rd.


  • Status: Construction
  • Contact: Dewey Phan
  • Publish Date: March 11, 2022

Project Scope

The proposed project consists of storm slide repair with lagging/retaining walls and roadway reconstruction caused by the 2017 and 2019 damage in Napa County.  The project will commence along: Dry Creek Rd. MPM 6.2, RDS 21-30, Dry Creek Rd. MPM 9.48, RDS 21-39, Dry Creek Rd. MPM 9.75, RDS 21-06 and Diamond Mountain Rd. MPM 1.1, RDS 21-04.

Engineer Estimate: $2,015,000.  The Contractor shall possess a Class A License at the time of contract award.

Bid Documents

The bid documents are available for viewing and download in the link below.  Addendum 1 was added.  Addendum 2 was added with new plansheets on 03/25/22.  The bidders list is posted.  Addendum 3 has been added. Addendum 4 has been added.  The bid opening was 04/07/22 at 11:30 AM, the project was awarded on 04/19/22 to Piazza Construction for their low base bid and add alt.  The 3 lowest sublists sheets have been posted.  The bid tabulation has been added.

ContractorTotal Base BidAdd. Alt Bid
Piazza Construction - Penngrove, CA$2,282,930.00$150,716.00
Granite Rock Company - San Jose, CA$2,424,246.00$127,628.00
Maggiora & Ghilotti - San Rafael, CA$2,456,700.00$189,655.00
Ghilotti Construction Co. - Santa Rosa, CA$2,456,789.10$182,671.00
Gordon N. Ball - Alamo, CA$2,911,095.00$137,371.00
Suulutaaq, Inc. - Suisun City, CA$2,989,819.60$185,984.00