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River Islands Development at Lathrop January 2021 FINAL River Islands Non-Potable Water Technical Report Rev 2 #6520 1 Introduction 1.1 Background River Islands, located on the Stewart Tract in the City of Lathrop (City), is a 4,905-acre, master planned community to be constructed southwest of the San Joaquin River. The River Islands development will consist of low, medium and high density residential,schools(institutional), parks and commercial land uses. River Islands will be constructed in two separate phases known as Phase I and Phase II. Phase I is currently being constructed over 4 separate stages (1A, 1 B, 2A, &213) and Phase II is entering the master planning stages. River Islands is planning on expanding the Non-Potable Water (NPW) distribution system to continue to service the development's NPW irrigation demands. At full buildout, the River Islands NPW distribution system will consist of one pressure zone pressurized from two NPW booster pump stations. Under normal operating conditions,the primary source of water for the River Islands NPW distribution system will be Title 22 recycled water(RW)from the City of Lathrop's RW distribution system. RW entering the development can either be stored in a recycled water storage pond located south of the development, or into air gap manholes feeding the wet well of each pump station. Currently, the Main Pump Station's NPW irrigation pumps are the only source of pressure for the distribution system and has a firm pumping capacity of 2,400 gallons per minute (GPM). In 2013, the City approved the Third Amendment to the 2003 Amended and Restated Development Agreement by and the City of Lathrop and Califia, LLC. That Third Amendment included Section 6 regarding Infrastructure Maintenance and Section 7 regarding Ownership and Operation of Public Facilities. These Sections specified that "RD 2062 shall own, operate and maintain levees, lakes, pumps and storm drainage equipment related to the lakes". All parties to the Third Amendment have taken this to include a variety of non-potable mains that together meet the needs of the lakes, including: • Non-potable irrigation lines (purple pipe)that takes Lakes Water, River Water, Recycled Water and potable water and delivers them to urban landscaping on public parks, medians and street side landscaping on the more major roadways. RD 2062 has been approved by the City as a RW user. • Lake Fill lines to bring water from adjacent rivers into the project lakes, • Lake Evacuation lines to take water from the lakes and dispose of them outside the developed area, • Lake Connect lines that connect the various lakes together by gravity, • Lake Circulation lines that pumps water between lakes for circulation, and • Lake Aeration lines that pump air into the lakes to keep them healthy. These lines are sometimes located within the public right of way, and they are owned and operated by Reclamation District 2062 (RD 2062) and the River Islands Public Financing Authority (RIPFA), a Joint Powers Authority made up of RD 2062 and Lathrop Irrigation District. Separately, the City of Lathrop owns and operates a recycled water system of purple pipes that currently delivers recycled water from the CTF to storage ponds and agricultural sites in the City. That same City system delivers RW to the Lake 3 Pump Station, where it is blended with Lake Water, River Water and/or potable water and then pumped to urban irrigation sites in River Islands. 5