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FINAL DRAFT PRELIMINARY REPORT (Connections to EOCF #2) 4.4 City of Tustin Two potential locations were identified in the City of Tustin: Walnut Well site and the Pasadena Well site. Due to PFAS levels, the City will need to abandon the Tustin Well facility. This would make this site available, however, due to its limited property, constructing any facility at this location would require the purchase of additional private property. In addition, the only EOCF#2 connection in the vicinity of the well site is Santa Ana's SA-06 Connection. The following is a summary of the two potential locations. Walnut Well Site: The Walnut Well, located at the southwest corner of Red Hill Ave. and Walnut Ave., was drilled in 1922 for the Irvine Company. City of Tustin Water took over the operation of the well in 1977. The City is planning to abandon the existing well. However, the City may be required to abandon the Tustin Avenue Well prior to the Walnut Well due to it exceeding the PFAS Response Level. This will force the City to keep the Walnut Well operational longer, until at least, the PFAS treatment can be built for the remaining wells. Access to the site is only available from the surrounding streets and any work at the site will impact traffic at the intersection. The Walnut Well is located within the City's Zone 1 (HGL 308). See Figure 6 for the existing Walnut Well site location as well as the proposed improvements. Proposed improvements for 3 to 5 cfs excess groundwater: demolish/abandon existing Walnut Well; EOCF#2 Pump Station (three pumps) with no surge tanks due to site limitations; suction from distribution system (16-inch pipe within Walnut Ave.); new high pressure discharge to OC-43 at Newport Ave. and Walnut Ave.; and upgrade OC-43 connection and meter facilities (owned by East Orange County Water District). In addition, increase the well capacity within Zone 1 by at least 5 cfs (additional new well as well as upgrading the RO Treatment facilities for the wells at the Main Plant). The intent is to convey excess groundwater from the Zone 1 distribution system to South Orange County. One potential site for replacement of the Walnut Well may be within the existing orange grove at 14462 Red Hill (across the street from the existing Walnut Well site). In summary, the above proposed improvements can provide up to 3 to 5 cfs excess groundwater to South Orange County. The City of Tustin will benefit from the new well and the upgrade of the RO Treatment facilities for the wells at the Main Plant. Pasadena Well Site: The Pasadena Well, located at the corner of West 2nd Street and Pasadena Ave. adjacent to Costa Mesa Freeway — SR-55. Adjacent to the existing Pasadena Well building is a narrow grass landscape area that may be used for the proposed EOCF#2 Pump Station. The site is narrow and may require the reduction in size of the proposed facilities. The Pasadena Well is located within the City's Zone 1 (HGL 308). See Figure 6 for the existing Pasadena Well site location as well as the proposed improvements. Proposed improvements for 3 to 4 cfs excess groundwater: remove existing landscape/hardscape improvements; EOCF#2 Pump Station (three pumps) with no surge tanks due to site limitations; suction from distribution system; new high pressure discharge to OC-43 at Newport Ave. and Walnut Ave.; and upgrade OC-43 connection and meter facilities (owned by East Orange County Water District). In addition, increase the well capacity within Zone 1 by at least 5 cfs (additional new well as well as upgrading the RO Treatment facilities for the wells at the Main Plant). Intent is to convey excess groundwater from the Pasadena Well to South Orange County. Orange 9t9%9 1District/Moulton Niguel Water District 30 - 24 5/17/2 A TECH Evaluation of Groundwater Conveyance Options 12