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FINAL DRAFT PRELIMINARY REPORT (Connections to EOCF #2) 4. PROPOSED FACILITY PLANS 4.1 General Selection Criteria The proposed facilities to convey excess groundwater to South Orange County will need to consist of the following: source of the excess groundwater (i.e. reservoir or connection to a distribution system with enough capacity); EOCF#2 Pump Station; new high pressure discharge piping from the proposed pump station to the connection to the East Orange County Feeder No. 2; pressure reducing facility to allow high pressure water to be relieved back into the City's distribution system; and connection to the East Orange County Feeder No. 2 existing piping facilities (between the meter vault and the MWD connection vault). The general criteria implemented was to identify any potential locations for the proposed EOCF#2 Pump Station in the vicinity of an existing East Orange County Feeder No. 2 connection. Potential locations included open space/empty lots and properties owned by the corresponding water agency. It should be noted that in the immediate vicinity of the existing East Orange County Feeder No. 2 import water connections, the area is fully developed (mostly commercial) and there are almost no vacant lots/sites that are existing. Therefore, the initial focus was identifying properties owned by the corresponding city as then no land acquisition would be required. The following is a summary of the preliminary locations that were identified as potential sites that did not require land acquisition. 4.2 City of Santa Ana Two potential locations were identified in the City of Santa Ana: East Station Facility and the Cambridge Facility. The following is a summary of each of these facilities. East Station Facility: The East Station Facility is located within the City's Low Zone and consists of a 6 MG storage reservoir fed by one groundwater well (Well 26) and a booster pump station that supplies water to the distribution system from the storage reservoir. If Well 26 is out of service, the reservoir is filled from the distribution system. The booster pump station includes two pumps with a firm capacity of approximately 2,300 gpm. Both pumps are operated with VFDs that are controlled by pressure of the discharge header pipe. See Figure 1A for the existing East Station Facility layout as well as the proposed improvements. Proposed improvements for potential of 7 cfs excess groundwater: EOCF#2 Pump Station (three pumps) with surge tank on discharge side; suction from East Reservoir; and new high pressure discharge to City of Santa Ana's SA-7 Pressure Regulating Station at Ritchey Street and Costa Mesa Freeway (SR-55). Intent is to convey Well 26 groundwater water to South Orange County. The existing East Pump Station can also take water from the East Reservoir as needed to maintain distribution pressure. Due to the size of the East Reservoir (6 MG), additional excess groundwater could be conveyed to the South Orange County if it was able to be consistently supplied to the reservoir. The City's distribution system could handle some additional flow (flow to meet the City's demands and provide excess to the reservoir) but not a guaranteed amount and not an additional 7 cfs. If a new well is constructed at the East Station Facility, the groundwater pumped by both of the wells could be conveyed to South Orange County. Thus, a total of about 14 cfs excess groundwater could be made available with the new well and a fourth pump in the proposed EOCF#2 Pump Station. To allow the City the availability of moving the additional well water from the new well from the reservoir during normal operation activities, an additional pump or pump upgrades to increase the pump capacity would be needed by the City. Orange 9t9%9 1District/Moulton Niguel Water District 30 - 21 5/17/2 A TECH Evaluation of Groundwater Conveyance Options 9