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FINAL DRAFT PRELIMINARY REPORT (Connections to EOCF #2) In summary, the above proposed improvements can provide up to 14 cfs excess groundwater to South Orange County. The City of Santa Ana will benefit from having a new well that can be used at its discretion all year long except during the time of conveying excess groundwater to South Orange County as well as pump upgrades and additional pumping capacity at its existing pump station. Cambridge Facility: The Cambridge Station Facility is located within the City's High Zone and consists of a 1.3 MG storage reservoir fed from the distribution system and a booster pump station that supplies water to the distribution system from the storage reservoir. Well 38 is also onsite and supplies groundwater directly to the distribution system. Also, on -site is the abandoned Well 22. The booster pump station includes three pumps with a firm capacity of approximately 5,400 gpm. All booster pumps are constant speed that turn on and off based on the pressure of the discharge header pipe. See Figure 3A for the existing Cambridge Station Facility layout as well as the proposed improvements. It should be noted that per the OCWD PFAS Treatment Systems Planning Study Producer Report for City of Santa Ana, the City may be adding up to eight IX vessels and prefiltration facilities at the Cambridge Station Facility. The City may want to receive the open space adjacent to the Cambridge Reservoir for these proposed improvements and move the proposed improvements noted below to the open space to the west of the site. There appears to be sufficient space for both proposed improvements to be constructed. Proposed improvements for 10 cfs excess groundwater: new Well 22 replacement (feeds groundwater to reservoir); EOCF#2 Pump Station (four pumps) with surge tank on discharge side; suction from Cambridge Reservoir; and new high pressure discharge to City of Santa Ana's SA-6 connection to the East Orange County Feeder No. 2 at Santa Clara Ave. and Tustin Ave. The intent is to convey the new Well 22 and portion of Well 38 groundwater to South Orange County. The existing Cambridge Pump Station can also take water from the Cambridge Reservoir as needed to maintain distribution pressure. Due to the smaller size of the Cambridge Reservoir (1.3 MG), some of the Well 38 groundwater will need to be used by the City's distribution system to maintain pressure and meet demands. In summary, the above proposed improvements can provide up to 10 cfs excess groundwater to South Orange County. The City of Santa Ana will benefit from having a new well (replacement Well 22) that can be utilized at the City's discretion at all times except during the time it is used to provide excess groundwater to South Orange County. 4.3 City of Orange Two potential locations were identified in the City of Orange: City Yard and the Batavia Plant. The following is a summary of each of these locations. City Yard Facility: The City Yard Facility is located at Jamison Street and Almond Ave and is within the City's 390 Zone. The site includes the City Public Works yard, including buildings, material storage bins, workshops, and Well No. 25. It should be noted that Well No. 25 was drilled in 2000. Well No. 25 supplies groundwater directly to the distribution system. See Figure 4A for the existing City Yard Facility site layout as well as the proposed improvements. Proposed improvements for 7 cfs excess groundwater: EOCF#2 Pump Station (three pumps) with surge tank on suction and discharge pipelines; suction from distribution system (18-inch pipe) located within Almond Ave.; and new high pressure discharge to City of Orange's OC-42 MWD connection at La Veta and Tustin Ave. The intent is to convey Well No. 25 and a portion of the adjacent Well No. 27 groundwater to South Orange County. It should be noted that the City of Orange does not receive any benefits from these proposed improvements to provide the 7 cfs excess groundwater. Orange 9tq%9 1District/Moulton Niguel Water District 30 - 22 5/17/2tIMA TECH Evaluation of Groundwater Conveyance Options 10