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River Islands Development at Lathrop January 2021 Final River Islands Potable Water Technical Report—Rev 3 #6520 2 Potable Water Supply Requirements 2.1 River Islands Land Uses The City's Standards and Master Plans provide the minimum design standards for all potable water facilities and appurtenances to be installed in the City of Lathrop. O'Dell Engineering, serving as the civil engineer for the River Islands Development, provided land use exhibits showing each parcel's boundaries and land uses for Phases I and II (see Appendix A) in accordance with the City's requirements. The River Islands development will consist of low, medium and high density residential, schools/institutional, parks, and commercial land uses. The employment centers located in the south of River Islands are categorized as commercial land uses. To be described in Section 2.2,the potable water demands for each parcel are determined by each parcel's land use and the number of dwelling units or applicable service area. Considering a parcel's entire gross area for potable water demands has the potential to unnecessarily oversize the potable water distribution system, especially in cases where non-potable water will be used for outdoor irrigation demands within the parcel. Based on irrigation coverage exhibits (see Appendix B) and conversations with River Islands for the design of future infrastructure, the following Table 2-1 lists the percent of a parcel's area to be satisfied by the potable water distribution system. This table does not apply to residential land uses as they are estimated by the number of individual dwelling units. Table 2-1: River Islands Land Uses—Applicable Parcel Area Percent of Parcel's Gross Area to be Used for Potable Water Demands Land Use Calculations Phase I and II Commercial' 100% now, 85% intended in the future Phase I and II Industrial Not applicable as there are no industrial land uses within the River Islands Development As dictated by the irrigation coverage exhibit as Phase I Parks specific irrigation areas within each parcel having already been determined. 65% of 10% of the total parks gross area. The rest of Phase II Parks' the park will be designed and constructed as hard scape or irrigated by non-potable water Phase I and II Schools' 35% Phase I and II Institutional (Police Station etc.) 100% Notes 1. Based on conversations with River Islands for the preliminary design of future parcels with the indicated land use as these parcels are still in the planning phases. Non-potable is planned to be utilized in accordance with the State and City requirements to offset parcel potable demands,such as irrigation. Applicable parcel areas listed here will be updated in the model when improvement plans become available. Although there has been no discussion with RWQCB about using Reclaimed Water on private commercial property, that is a future goal. This report does not anticipate on-site use of Reclaimed Water at this time. Table 2-2 shows the total number of dwelling units or applicable service acreage of each land use within the River Islands development. The acreage shown in Table 2-2, reflects the parcels gross area listed in Table 2-1. 8