Groundwater Modeling and Reporting Services for the West Coast Basin Barrier Project

West Basin Municipal Water District is requesting proposals for groundwater modeling and reporting services in support of the West Coast Basin Barrier Project, with proposals due October 20, 2026, at 2:00 p.m. through the OpenGov procurement portal and questions due October 12, 2026.

The District offers up to 10 additional evaluation points for Small Business Enterprises, Local Business Enterprises, or Veteran-Owned Business Enterprises status (with an additional point for disabled veteran-owned businesses). The scope requires annual groundwater model updates using MODFLOW/SEAWAT over five calendar years (2026–2030), with deliverables including annual technical memoranda due by mid-March each year, fully documented model files, and a comprehensive Five-Year Engineering Report due September 2031. Work must be directed by a California-registered engineer or certified hydrogeologist with experience in advanced wastewater treatment for groundwater recharge. The project is regulated under Los Angeles Regional Water Quality Control Board Permit R4-2006-0069, Title 22 Recycled Water Regulations, and the State Recycled Water Policy. The consultant must obtain a Professional Geologist stamp for final report review and request annual injection and pumping data from the Los Angeles County Department of Public Works and Watershed Replenishment District.

The contract term is five consecutive years with no renewal options stated. A Notice of Recommended Award is expected the week of November 16, 2026. Proposals must remain valid for a minimum of 90 days. The consultant must maintain Commercial General Liability of $2 million, Business Automobile Liability of $2 million, Workers' Compensation at statutory limits, and Professional Liability of $2 million. Prevailing wages apply to any subconsultants. The District retains ownership of all reports, studies, and documents produced and reserves the right to reject proposals, negotiate with selected respondents, or award to multiple firms.