Nelson Wastewater Treatment Facility (WWTF) Improvements (NEL-C001)

Project Name: Nelson Wastewater Treatment Facility (WWTF) Improvements (NEL-C001)

Date Authorized: March 25, 2021 (pre-design)

Project Authorization: $16,085,000 (pre-design)

Delivery Method: Construction Manager at Risk (CMAR)

Design Firm: Black & Veatch/HDR Engineering

Contractor: To be determined: Staff plans to take recommendation from RFP 2021-045 to Board for Consideration on 10/21/21

Completion Date (Estimated): June 2029 (Substantial Completion)

Major Milestones (Estimated):

  • Preliminary Design April 2021 – April 2022
  • Award CMAR Pre-Design Services Contract October 2021
  • Water Infrastructure Finance and Innovation Act (WIFIA) funding application due, November 15, 2021
  • Final Design and GMP Development May 2022 – December 2023
  • Begin Construction January 2024
  • Substantial Completion June 2029
  • Final Completion December 2029

Future Pending Action(s):

  • Board action item for consideration of Construction Manager at Risk (CMAR) pre-construction phase services funding and contract award; anticipated October 21, 2021.
  • Board action item for consideration of WIFIA Application and Fee; October 14, 2021


  • Pre-design progressing on schedule, 24 weekly project meetings completed as of September 29.
  • Construction Manager at Risk - Nelson WWTF Improvements selection process – staff recommendation for Board consideration anticipated October 2021.
  • B&V/HDR team has submitted two technical memoranda which will be incorporated into the Basis of Design Report.
  • Special Sampling of wastewater and sludges at various locations throughout the Nelson Complex was completed from August 16 to August 29. The sampling is needed, along with historical data, to develop and calibrate a plant-wide computer model of the existing Nelson WWTF.
  • The construction of the full-scale chemical feed system pilot apparatus was completed in September. The pilot project will evaluate feasibility of the system to improve ammonia removal in the downstream process.
  • Collections O&M Building - To accommodate construction phasing at the Nelson WWTF, it was determined that the Collections O&M Building will need to be relocated. At a BOCC Study Session on September 2nd, JCW and the Design Engineer presented an analysis of the Collections O&M Building needs. A new property in the general vicinity of College Boulevard and Renner Road was shown to be the most cost effective solution. Property selection is currently underway.
  • Project stakeholder presentation meetings were held in-person September 29, online September 30. More details about these events are detailed on the project website: