Las Gallinas Valley Sanitary District

Las Gallinas Valley Sanitary District
Secondary Treatment Plant & Water Expansion

Working with the District on the upgrade, AQUA assisted in designing and constructing a fast-track project to provide recycled water to the North Marin Water District (NMWD). The recycled water facility was added to the back end of the existing facility processes and includes coagulation, pressure filtration using GE membranes, UV disinfection, and effluent pumping to deliver the water. The existing site did not allow much space for the addition of facilities, but working creatively with the District, the necessary facilities were added to the site. This upgrade allows the District to provide Title 22 compliant recycled water to NMWD. The initial phase provides 1.4 MGD of capacity and can be expanded by just adding additional equipment to 5.6 MGD. AQUA also provided onsite construction management for the upgrade project.

Project Study:

Client	Las Gallinas Valley Sanitary District
Reference	*Available upon request
Location	San Rafael, CA
Features	Four (4) train fixed film, activated sludge system New secondary clarifiers WAS thickening Modifications to the disinfection process Multiple phases were required to achieve the work on this land restricted site while continuing to meet discharge requirements Expansion of the Recycled Water Facility Expanded to treat and deliver 5.6 MGD of treated water Feed pumps Membrane expansion New recycled water disinfection and storage tank New distribution pump station that allows water delivery to two adjacent Water Districts