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FINAL DRAFT PRELIMINARY REPORT (Connections to EOCF #2) For the purpose of this study, we have assumed that the operable wells will have a typical production rate of 60% during the winter months (November through April) and 80% during the summer months (May through October). The following Table 2.1 summarizes the City of Santa Ana demands and potential available excess groundwater. Table 2.1 City of Santa Summary of Demands and Potential Available Excess Groundwater Winter Months (Average) Summer Months (Average) Total Annual Demands (3-year Historical Average) City System Demands 822 MG 1,016 MG 11,020 MG Import Water 165 MG 371 MG 3,210 MG Groundwater Production 657 MG 645 MG 7,810 MG Basin Production Percentage 80% 63% 71% Typical Wells Operating (Potential Wells Available for Excess Groundwater) Historical Operation 9 wells operating (9 wells available) 7 wells operating (11 wells available) 8 wells operating (10 wells available) Assuming No Import Water 11 wells operating (7 wells available) 11 wells operating (7 wells available) 11 wells operating (7 wells available) Note: Above table does not include the future wells (Washington and Well 22 Replacement) To support the above findings, the 2017 Water Master Plan for the City identified that the City's water system has adequate capacity and distribution capabilities to supply the entire City's water system demands for existing, near - term and buildout maximum day demand scenarios using only groundwater wells (with the assumption that the largest well in both the Low and High Zone are out of service). In summary the City of Santa has potential well capacity that could be available to convey groundwater per the Emergency Services Program. The quantity of water will depend on the City's distribution system and corresponding facilities at the specific location of the proposed source connection. The potential available groundwater water will be summarized in Section 4. 2.3 City of Orange The City of Orange Water System has a total of twelve (12) groundwater wells and eight (8) import water connections. Ten (10) of the City wells pump into the City's 370 Zone and the remaining two (2) pump into the 490 Zone. Five (5) of the wells are currently not in service due to PFAS. The City is also concerned that four (4) additional wells will be impacted in the near term by PFAS and will need PFAS treatment facilities as well. The following is a summary of the import water connections: OC-3 connected to MET's Orange County Feeder; OC-40 and OC-42 connected to East Orange County Feeder No. 2; OC-67 and OC-69 connected to Allen-McColloch Pipeline; one EOCWD Connection, source is the Allen-McColloch Pipeline; and two connections with Serrano Water District (SWD-1 and SWD-2). Table A-2 (within Appendix A), summarizes the eleven (11) wells that had operated during the three-year historical period. During the three-year historical period, the City has pumped on an average 77% of its water demand from the groundwater basin. City is currently under design for two new wells, Well No. 28 and Well No. 29, which will replace Well No. 8. Orange 9t9%9 1District/Moulton Niguel Water District 30 — 16 5/17/2 A TECH Evaluation of Groundwater Conveyance Options 4