Trickling Filter Media Replacement at Plant No. 1, Project No. P1-142

The Orange County Sanitation District is soliciting Project No. P1-142 for the Trickling Filter Media Replacement at Plant No. 1, located at 10844 Ellis Ave in Fountain Valley, California. The scope of work involves replacing aging media within the trickling filters, performing coating repairs on the media-holding structures, and installing a new media wetting/sprinkler system along with a fiberglass reinforced plastic grating under drain system. The project is classified under NAICS code 237990. This project is exempt from the California Environmental Quality Act under Class 1 categorical exemptions, as the work consists of repair, maintenance, and minor alterations without expanding the facility's capacity or use. Andrew Brown, Engineering Supervisor, serves as the primary point of contact and lead agency representative for the project. The solicitation was posted on October 24, 2025, and the associated Notice of Exemption was signed on October 21, 2025.