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PROPOSALFOR �1 h" y RFP NO.: 23-030 i® SANTIAGO PUMP STATION MODIFICATIONS, Santiago Creek, CA The original Santiago Pump Station was constructed at the bottom of Bond Basin in 2002. Four submersible pumps, each with their own MCC, were installed with varying power and head capacities to accommodate large fluctuations in water elevation. Soon after commissioning the station, three of the four pumps failed. In 2011, Orange County Water District (OCWD) installed the floating pump station that is currently in use. In 2019, the last functional submersible pump failed, leaving OCWD without the ability to pump water from Santiago Basin when the water elevation is above 240- feet. The OCWD identified two potential solutions to regain pumping capacity when water elevations are above 240-feet: (1) Add two small pumps to the floating station and construct any necessary modifications to accommodate the additional pumps; or (2) Replace the existing larger pump drives with Variable Frequency Drives (VFD) and construct any additional necessary modifications that will allow the pumps to function within the configuration of the existing facilities. The goal of this project was to provide a recommendation and prepare 65% plans on the optimal option to restore the ability to pump water from Santiago Basin. Preliminary evaluations of the options, included identifying the appropriate VFD and their potential costs; coordinating with the barge manufacturer for additional barge sections to accommodate the two smaller pumps; and working with the pump manufacturer to obtain potential costs for the purchase of two smaller pumps. FLEMING ZONE 8 TANK AND ZONE 8 TO 9 BOOSTER PUMP STATION IMPROVEMENTS, Orange County, CA Irvine Ranch Water District (IRWD) provides potable water supply service to the Santiago Area located in an unincorporated region of Orange County. This service area includes four distinct sub -areas containing a system of reservoirs and pump stations that solely rely on the existing 150,000-gallon steel Zone 8 Fleming storage reservoir and the existing Zone 8 to 9 booster pump station as the main source of water supply. In 2017, IRWD completed an analysis and recommended improvements for the undersized infrastructure and requirements for additional storage. This project included several primary components, including: • Demolition of the existing reservoir and pump station • A new above ground 1.3 MG prestressed concrete reservoir • Replacement of the Zone 8 to 9 pump station with three 600 GPM pumps • A replacement storage building • An RMS building with sodium hypochlorite/aqueous ammonia treatment • A 2,000-gallon diesel fuel storage tank • Siting for electrical service, controls, and telemetry improvements City of Santa Ana