Item 21 - Pressure Control Station Relocation and Transmission Main Improvements

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surge tanks in addition to eight 12-inch diameter surge anticipator valves on the suction side of the pump station to prevent overpressurization of the AMP. As part of the project, analyses of the OC-88A pump station, the OC-82 pump station and 20 turnouts were also performed. Recommended surge protection at OC-88A in the form of an approximately 600 ft3 surge tank and two 12-inch surge relief valves was installed and testing verified that maximum HGL elevations in the AMP remained below the allowable. Flow control valve operating times were determined at each turnout to prevent adverse pressure surges from propagating back into the AMP. Baker Pipeline and Product Water Pump Station, Orange County, CA Michael Baker International/Irvine Ranch Water District Was Project Manager/Project Engineer for the surge analysis of the Baker Pipeline and pump station for the delivery of up to 53 cfs from the Santiago Lateral and Irvine Lake Pipeline. The flow was able to be delivered by gravity or though use of the Raw Water Pump Station to the WTP. Analyses involving the Product Water Pump Station concentrated on the effect the pressure surges generated by the pump station delivering 33 cfs would have on MWD's Allen McCulloch Pipeline (AMP) as well as to the South County Pipeline. Due to maximum pressure constraints on the AMP, a pressurized surge tank as well as a surge relief valve was recommended to be installed. Orange County Groundwater Replenishment Project, Orange County, CA Orange County Water District Was Project Manager/Project Engineer for the surge analysis of many aspects of the GWR Project. Surge analyses were performed for the reverse osmosis system including the Transfer Pump Station and the RO Feed Pumps under two phases of development. Surge analyses were also performed for the Barrier Pump Station and the effects of the surges generated on the Barrier Distribution system for flows up to 71 mgd. Finally, surge analyses were performed for the Project Water Pump Station and the Project Water Pipeline for four flow scenarios with a maximum of 192 mgd. Surge protection for the systems ranged from recommending minimum pipeline pressure classes to the installation of multiple surge tanks and vacuum relief valves. Sepulveda Canyon Bypass Project, Los Angeles County, CA Metropolitan Water District of Southern California Project Manager/Project Engineer - Surge analysis modeling was performed for the entire Sepulveda Feeder to determine the effects that sudden loss of load to the new turbine facility and the existing Venice facility would have on the feeder. The analyses showed that due to the numerous possible operating HGL conditions under which the system could operate, exceedance of the maximum allowable HGL elevations for the feeder between the two facilities was possible. Additionally, it was shown that the minimum HGL elevation would fall sufficiently far as to create a vacuum condition in the downstream end of the Sepulveda Tunnel. Lake Perris Bypass Facility Pump Station, Riverside County, CA Metropolitan Water District of Southern California Starting in 1991, Scott has performed multiple hydraulic and pressure surge analyses for Lake Perris Bypass Facility Pump Station under many operating and supply conditions. The pump station has the capacity to deliver up to approximately 250 cfs to the Mills Filtration Plant and/or Lake Perris, depending on the source of flow. Flow can be provided to the pump station from Lake Perris, the Casa Loma/San Diego Canal, or Diamond Valley Lake. Pipelines required for the modeling effort included the Inland Feeder, Eastside Pipeline, Lakeview Pipeline, Lake Perris Bypass, Box Springs Feeder, and the Santa Ana Valley SCOTT FOSTER ENGINEERING, INC. 2 of 3