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FINAL DRAFT PRELIMINARY REPORT (Connections to EOCF #2) For the limits of the initial evaluation, the East Orange County Feeder No. 2 is located within Tustin Avenue in the cities of Orange and Santa Ana and within Walnut Avenue and Red Hill Avenue in the cities of Santa Ana and Tustin. The following are the potential locations for the connections to the East Orange County Feeder No. 2: OC-40 and OC-42 in the City of Orange; SA-6 and SA-7 in the City of Santa Ana; and OC-43 and OC-48 (East Orange County Water District turnouts) in the City of Tustin. See Exhibit 1 for an Overview of the study area which shows the East Orange County Feeder No. 2 alignment and the location of each of the existing import water connections. The following is a brief summary of the locations of these import water connections: • OC-40 (City of Orange): Heim Avenue and Tustin Ave. • OC-42 (City of Orange): La Veta and Tustin Ave. • SA-6 (City of Santa Ana): Santa Clara Ave. and Tustin Ave. (design capacity is 20 cfs with normal operating capacity of 12 cfs) • SA-7 (City of Santa Ana): Warner Ave. and Red Hill Ave. (design capacity is 50 cfs with normal operating capacity of 7.5 cfs) • OC-48 (East Orange County Water District— City of Tustin): Fairhaven Ave and Tustin Ave. • OC-43 (East Orange County Water District — City of Tustin): Walnut Ave. and Newport Ave. The location of the proposed EOCF#2 Pump Station should be in vicinity of the appropriate agency import water connection. 3.5 Potential Inter -agency Connections An option for conveying excess groundwater could be achieved by constructing a potential inter -agency connection which could be used to convey excess groundwater from one agency to another to minimize the number of new EOCF#2 Pump Stations. The reason to evaluate this option is that the City of Santa Ana does have excess available well capacity and that maybe this available capacity could be conveyed through the City of Orange or Tustin distribution systems to minimize the number of EOCF#2 Pump Stations. The intent of the inter -agency connections is that they would be able to be used for emergency purposes or on as -needed situations and not just for conveying the excess groundwater to South Orange County. The following is a summary of the corresponding pressure zones that are adjacent to each of the cities: • City of Santa Ana High Zone (HGL of 340 to 350) and City of Orange 390 Zone • City of Santa Ana Low Zone (HGL of 270) and City of Tustin Zone 1 (HGL of 308) During times of normal operation, the City of Orange and City of Tustin can provide water to the City of Santa Ana but the City of Santa Ana can not provide water the other direction without a substantial drop in pressure within the other cities' distribution system. For the conveyance of excess groundwater, the City of Santa Ana has the most potential excess groundwater available. However, the operating pressure of Santa Ana's distribution system is lower than the adjacent cities distribution system so that the excess groundwater will not be able to be conveyed within the City of Orange/Tustin's distribution system without increasing the discharge pressure from the City of Santa Ana's distribution system. Therefore, it does not make sense to evaluate any potential inter -agency connections for the purpose of conveying excess groundwater to South Orange County. Orange 9tq%9 1District/Moulton Niguel Water District 30 - 20 5/17/2 A TECH Evaluation of Groundwater Conveyance Options