As part of OCWDs PFAS Treatment Facilities and Program Agreement with the City of the Santa Ana, the District is funding and constructing the City of Santa Ana PFAS Treatment at John Garthe Reservoir Project. The District will administer the construction contract and provide all inspection during construction. Upon filing of the Notice of Completion, the District will transfer the treatment system and City improvements constructed as part of the Contract to the City. The proposed PFAS treatment system will treat up to 9,600 gallon per minute of water produced from five (5) existing City wells: 18, 24, 32, 36, and 39. Treated water will be conveyed to on-site reservoirs for storage and later pumped to distribution to meet system demand. The existing site includes two 5.0 million gallon circular reservoirs, one 5.0 million gallon rectangular reservoir, pump station, wells 18, 36, and 39, on-site sodium hypochlorite generation and storage facility, Metropolitan Water District turn-out, and hydro-generation facility. The work is confined to the City’s property. The PFAS treatment system consists of three (3) multi-filter cartridge filter pressure vessels, six (6) ion exchange absorption trains; each train consists of two (2) 12-foot diameter pressure vessels and valve manifold. Vessels and pipe racks will be placed on a reinforced concrete pad. Treated water is conveyed to the north and south reservoirs. The Contractor will be responsible to for coordinating loading of District furnished ion exchange resin media. In addition to the PFAS treatment system, work includes improvements to the existing wells and facilities. Well 39 work includes: replacement of the well pump, replacement of the well pump motor, replacement of the existing pump drive with a variable frequency drive, replacement of the existing well discharge piping, valves and appurtenances; replacement of the existing hydro-generator, piping, valves and appurtenances; ventilation improvements to the existing well building; expansion of the existing building to house relocated electrical panels for the hydro-generation unit, well, and PFAS treatment controls. Well 36 work includes: replacement of the well pump, replacement of the well pump motor, replacement of the existing pump drive with a variable frequency drive, replacement of the existing well discharge piping, valves and appurtenances; Work at well 18 includes: replacement of the well pump, replacement of the well pump motor, replacement of the existing pump drive with a variable frequency drive, replacement of the existing well discharge piping, valves and appurtenances; and construction of a new CMU building housing the well pump, motor, piping and electrical equipment. Site improvements include: construction of sand separator for well 32; replacement of the existing 100 pound per day sodium hypochlorite generation system with a 400 pound per day system; upgraded metering pumps, upgraded brine maker, bulk sodium hypochlorite and brine storage tanks, concrete containment area with steel canopy; new reservoir isolation valves; screen wall; landscaping, and site drainage improvements.
