Shimmick implemented several improvements to the existing Foothill Water Treatment Plant. Work included demolishing select portions of the existing water treatment plant and protection in place of all existing systems and buildings to remain; a new sand separator system to capture particles, such as iron sulfide and sand, which the wells produce during operation; and a new oxidation media filtration (OMF) process to remove iron, manganese, hydrogen sulfide, iron sulfide, and arsenic.
The OMF system proactively removes these foulants upstream of the Reverse Osmosis (RO) system and significantly reduces the fouling potential of the RO membranes. A proof pilot test was required for the proposed OMF system to demonstrate adequate removal of the target constituents from the raw City well water.
Shimmick installed the a new pre‐treatment system adjacent to and within the existing RO WTP building and chemical storage footprint without modifying the building envelope. Additional work included upgrades to the RO system and membranes to increase facility reliability, operability, and to operate at full capacity product water; upgrades to the existing facilities to include new chemicals required for the media filtration process and improve existing chemical systems; and electrical and control systems for new pre‐treatment processes.
