55C - WATER SUPPLY ASSESSMENT FOR MAINPLACE

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of Santa Ana 4.5.2 System Pressures MainPlace Mall Transformation Project Water Supply Assessment The system supplies potable water to two pressure zones (High Zone and Low Zone) and consists seven booster pump stations, and four pressure reducing valve/pressure sustaining valve (PRV/PSV) stations. In general, the facilities are consolidated into several stations consisting of multiple groundwater wells, a storage reservoir, and a booster pump station. At each station, the wells pump groundwater to the storage reservoir and the booster pump station pumps the water from the storage reservoir to the distribution system. The system also includes several wells that pump directly into the distribution system with no storage reservoir or booster pump station. There are four PRV/PSV stations that allow flows from the High Zone to the Low Zone. 4.5.3 Local Project Infrastructure The City owns and maintains street and water infrastructure surrounding and within the MainPlace Mall site. Mainplace Drive surrounds the north, west, and east sides of the mall. In addition to Mainplace Drive, a public street, an on -site main private drive aisle that surrounds the all four sides of the mall is located immediately adjacent to the mall structure. The project site lies at the extreme north end of the City's water system. The City has water mains in the following locations: • A 16-inch asbestos cement pipe (ACP) in Main Street, terminating at the north leg of MainPlace Drive • A 16-inch ACP in the south leg of MainPlace Drive from Main Street to the southwest mall entry drive • A 12-inch ACP in the north leg of MainPlace Drive from Main Street to the north leg of the on -site private ring road. • A 16-inch ductile iron pipe under 1-5, connecting to the MainPlace Drive main at the southwest corner of the project site A 16-inch ACP in southwest private drive entry from MainPlace Drive to the on -site private ring road. This main is located in a public utility easement (PUE). • A 16-inch ACP in south private drive entry (the Broadway extension) from MainPlace Drive to the on -site private ring road. This main is located in a PUE. • A 12-inch ACP in the on -site ring road, looping around the project site. This main is located in a PUE. In addition to the mains, the City also has approximately 15 fire hydrants near the project site and approximately 24 water meters serving the site. The infrastructure adjacent to the project site was installed in the 1990s and is not identified for replacement in the 2017 Water Master Plan. The project site is located in the City's high-pressure zone and hydrant flows are in the highest category listed in the 2017 Water Master Plan. Kimley»)Horn 55 -27 Page 119