Agenda Packet_2022-05-17 - Laserfiche WebLink

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FINAL DRAFT PRELIMINARY REPORT (Connections to EOCF #2) With no reservoir within the vicinity to take suction from, the distribution piping in the area restricts the maximum excess groundwater available to the amount of one well or about 7 cfs. If additional excess groundwater capacity is desired, an additional new well will need to be constructed within the City Yard Facility. This could provide an additional 5 cfs of excess groundwater available to be conveyed to South Orange County. However, due to the distribution system piping, the City will not be able to operate the three wells (Well No. 25, No. 27 and the new well at the same time) without additional pipeline distribution improvements. Proposed additional pipeline distribution improvements: 700 feet of new 12-inch pipeline within Lincoln Street from Almond Avenue to Chapman Avenue (shown on Figure 4); and 1,400 feet of new 12-inch pipeline within Chapman Avenue from westerly 55 Freeway off -ramp to east of the 55 Freeway and Santiago Creek. It should be noted that the proposed pipeline within Chapman Avenue will need to be bored across the Santiago Creek as well as the easterly off -ramp from the 55 Freeway (about 600 feet in length). In summary, the above proposed improvements can provide up to 7 cfs excess groundwater to South Orange County, and up to 12 cfs if an additional new well is constructed onsite and about 2,100 feet of new 12-inch pipeline is constructed to improve the City's distribution system. The City of Orange will benefit from the new well as long as the additional distribution improvements are constructed. With the additional distribution pipeline improvements, the City will be able to operate all three wells, if they desire, and will be able to convey the additional groundwater to a portion of the City that currently needs additional capacity as well as providing reliability to the hospital located near the proposed improvements. It should be noted that it appears there are two sites in close proximity to the OC-42 connection that could possibly be used to construct the proposed EOCF#2 Pump Station: 1800 E La Veta (Rehabilitation Institute of Southern California); and Caltrans right-of-way adjacent to the Garden Grove Freeway (SR-22). Based on the existing size of the City's distribution piping adjacent to these sites (24-inches in diameter), the EOCF#2 pump station may be able to convey 7 cfs excess groundwater from the City's existing wells and up to 14 cfs excess groundwater if a new well was construction within this general area of the City. The ability to convey this capacity of excess groundwater would need to be confirmed by utilizing the City's existing water model once it is determined that purchasing one of these properties is potentially feasible and the anticipated land cost would be reasonable (comparable to the cost of the high pressure discharge from EOCF#2 Pump Station to OC-42 MWD connection). Batavia Plant Facility: The City of Orange Batavia Plant Facility is located at 2443 N. Batavia Street (just south of Fletcher Avenue) and is within the City's 390 Zone. The site includes the following: 0.5 MG steel reservoir (constructed in 1970 and is off- line); Well No. 1 (drilled in 1950 and is off-line); and Plant B-1, B-2 and B-3 booster pump station (off-line). These existing facilities would need to be demolished in order for the site to be used for the proposed new well and EOCF#2 Pump Station. Proposed improvements for 7 cfs excess groundwater: demolition of existing steel reservoir and pump station; abandon/demolish existing Well No. 1; EOCF#2 Pump Station (three pumps) with surge tank on suction and discharge pipelines; suction from new well and supported by distribution system (16/12-inch pipe located within Batavia St.); and new high pressure discharge to City of Orange's OC-40 MWD connection at Hein Ave. and Tustin Ave. The intent is to convey the new well groundwater to South Orange County. In summary, the above proposed improvements can provide up to 7 cfs excess groundwater to South Orange County. The City of Orange will benefit from the new well as the only wells within this area of the distribution system are no longer in service (Well No. 1 and Well No. 15). The City's water system will be improved with the new well at the Batavia Plant. Orange 9tq%9 1District/Moulton Niguel Water District 30 - 23 5/17/2W&A TECH Evaluation of Groundwater Conveyance Options 11