Atascadero Mutual Water Company Water Treatment Plant Project

The proposed Atascadero Mutual Water Company (AMWC) Water Treatment Plant (WTP) project involves construction of a facility to treat for per- and polyfluoroalkyl substances detected within the AMWC production wells located adjacent to the Salinas River between State Route 41 and Chico Road. The WTP would be located within a portion of AMWC’s existing Corporation Yard at the northwest corner of the overpass of State Route 41 over Sycamore Road. Several components of the WTP would be located under metal canopies, the treatment vessels would be located in the open air, and the Operations Center would be enclosed in a prefabricated metal building that would be about 20 feet in height and approximately 3,800 square feet in size. Chemical storage facilities would be located under a metal canopy with covered chain-link fencing surrounding the chemical containment areas. The project includes installation of new outdoor lighting, including downward-facing pole-mounted lights and chain-mounted LED lights under canopies (shielded by quarter-height panels). Native landscape plants would be placed along the Sycamore Road frontage. Due to existing geotechnical conditions at the project site, ground improvements including over-excavation of materials, rapid impact compaction, and reconstruction of the over-excavation materials into a structural backfill would be conducted in certain areas to densify the ground beneath the project site and improve the soil conditions to be suitable for the proposed project. The proposed project would not result in increased groundwater extraction from AMWC’s production wells beyond baseline conditions.