Engineering Design and Construction Quality Assurance Services at the Yolo County Central Landfill

The County of Yolo, Department of Community Services, Division of Integrated Waste Management (DIWM) is seeking proposals from consultants to provide engineering design and construction quality assurance services for the Yolo County Central Landfill (Landfill). Specifically, the County wishes to contract with consultants experienced in the following areas. Note, the County intends to award to multiple consultants; therefore, expertise in all the following areas is not a prerequisite for submitting a proposal:

• Landfill base liner system design

• Landfill and Class II surface impoundment construction quality assurance (CQA)

• Landfill closure plans and cost estimates

• Landfill gas design, including GCCS design, flare selection, and electrical/mechanical system design

• Hydrogeology, groundwater modeling, control system design

• Storm water pollution prevention plans

• Engineering feasibility studies

• Experience working with the Central Valley Regional Water Quality Control Board and Yolo Solano Air Quality Management District

All work will be performed based on Task Orders developed for specific projects and on a time and materials, not-to-exceed basis. The County anticipates awarding professional services agreements to the successful proposers in December 2025. Proposals are due by 4:00 PM PDT on Thursday, November 06, 2025.

Proposers who submit a response to this RFQ must have the ability to meet the requirements, including the terms and conditions contained in Sample Agreement (Attachment 1).

Optional Pre-Proposal Meeting and Site Tour:

Date: October 9, 2025

Time: 11a Pacific Time

Place: Yolo County Central Landfill

Location: 44090 County Road 28H, Woodland, CA 95776

Bidders shall assemble at the main administration building located on the right-hand side upon entry to the landfill.

This will be a general site tour and review of the project locations associated with tasks 1 and 2. There will also be an overview of general background information on the landfill.