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On -Call Engineering Services WELL NO. 29 WITH PFOS AND PFOA TREATMENT SYSTEMS, Orange, CA Tetra Tech provided engineering design services for the well drilling and well equipping of a potable water well in the City of Orange. The City's Water Division operates a water distribution system including water mains, wells, pump stations, and reservoirs. The City pumps water from the groundwater basin through an existing well network that includes 12 active wells and imports water from the Colorado River and Northern California as a secondary sougpe: Well No. 29 is proposed to enhance the reliability, efficiency, and redundancy of the City's water system. Currently, Well No. 8 and its supporting facilities were I ocated within the existing site. The property was mostly unpaved and small areas of asphalt around the well facilities. No. 29 and PFOS/PFOA treatment system constructed. The Well No. 8 is to be destroyed and the new Well Well No. 29 will pump water to the 370 Zone and is expected to produce approximately 3,000 GPM. The PFOS/ PFOA treatment system shall be designed to treat approximately 3,500 to 4,500 GPM, which includes the total production of proposed Well No. 29 and existing Well No. 9, located 300 feet to the north. The well facilities include a wellhead enclosure, chlorination, and electrical building, with an external roll -up generator connection for backup power. The on -site piping includes piping from Well Nos. 9 and 29 to the treatment system and post treatment piping to the distribution system. The Water Division is to bid the well drilling phase and well equipping phase separately. The site includes building and landscaping design, paving, and fencing. Well drilling construction began in February 2021 and well equipping began after drilling was complete. ROSETON PLANT IMPROVEMENTS, Artesia, CA Golden State Water Company wants to add a 0.75 MG welded steel reservoir, booster station, and backup power generator to the existing plant. Included with the work is the relocation of the Fe/Mn backwash tank and skid mounted recycle pump, and relocation of the MCC for Well No. 2. The existing facilities to remain include Well No. 1 and No. 2, the three bay chemical building, Fe/Mn treatment system, and SCE transformer if it is determined it is adequately sized for the proposed and existing facilities. The booster pump station is to be comprised of four vertical turbine pumps each with a capacity of 1,000 GPM against system pressure (with assumed , 5 hp motors). The new Welded Steel Reservoir (WSR) shall have a usable capacity of 0.75 MG, with a separate inlet and outlet. The WSR inlet will incorporate an altitude valve to control tank filling with system water. Desired WSR dimensions shall have a maximum external height of 30 feet, an overflow level equal to 26 feet, and a diameter of approximately 70 feet. The groundwater wells will discharge into the WSR following wellhead treatment. Included in the design, will be improvements to fill the WSR from the distribution system via an altitude valve. A backup power supply shall be included which shall comprise of a Cummins diesel powered generator with Tier 4 emissions, sound attenuation suitable for a residential neighborhood, a fuel capacity capable of allowing the generator to operate 72 hours at full load, and an automatic transfer switch (ATS). The generator shall be capable of operating: one groundwater well pump; four booster pumps; Fe/Mn treatment system; SCADA and plant controls; and ancillary power needs. The sizing of the generator, fuel capacity and ATS will be coordinated with Cummins. Electrical services include evaluation of the proposed loads and determination if the existing SCE service will be sufficient to accommodate improvements. 0 TETRA TECH