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River Islands Development at Lathrop January 2021 FINAL River Islands Non-Potable Water Technical Report Rev 2 #6520 2 Non-Potable Water Irrigation Areas 2.1 Non-Potable Water Irrigation Areas- Phase I RD 2062 and the RIPFA, own and operate a private NPW distribution system to irrigate designated landscaping parcels, strips, traffic medians, schools, and parks throughout the River Islands development. O'Dell Engineering,serving as the Civil Engineer for the development, provided Irrigation Coverage Exhibits (see Appendix A) showing the approximate size and location of all Phase I areas that will utilize NPW for irrigation. For the River Islands Development,the town centers, commercial, designated open spaces, lake edges, and street landscaping will utilize a drip style irrigation system, while parks and schools will utilize a spray type irrigation system. Table 2-1 below, summarizes the gross (total) Phase I, NPW irrigation areas based on their irrigation system and location within Phase I. Table 2-1: Gross (Total) Non-Potable Water Irrigation Areas- Phase I Phase I Stage 1A& Phase I 1B Stage 2A Phase I Phase I Gross NPW Gross NPW Stage 2B Total Area Area Gross NPW Area Gross NPW Area NPW Irrigation Area Type (acres) (acres) (acres) (acres) Drip Irrigation Systems Town Center 46.00 0.00 0.00 46.00 Commercial 161.71 0.00 0.00 161.71 Open Space - Irrigated 10.26 9.79 10.98 31.03 Lake Edge Areas 0.88 3.95 6.08 10.91 Street Landscape 37.66 9.23 0.00 46.89 Spray Irrigation Systems Schools 30.00 15.00 0.00 45.00 Parks 56.68 18.48 13.11 88.27 Total 343.19 56.44 30.18 429.81 Notes: 1. NPW Gross Irrigation Areas and Quantities based on Irrigation Coverage Exhibits(Appendix A)or based on Land Use Exhibits for town center and commercial areas (Appendix B). Considering a parcel's entire gross area for NPW irrigation demands has the potential to oversize the NPW distribution system, especially when only a specific area of a parcel will be/is designed as a NPW irrigation area. Additionally, these NPW irrigation areas will have "hard scape" or non-irrigated areas which will further reduce the applicable NPW irrigation area. Therefore, the actual percentage of a parcel that will utilize NPW is listed in Table 2-2 for each land use type (Net NPW Irrigation Area). These percentages were provided by River Islands and are based on existing and future planned irrigation areas. Table 2-3 below lists the Net NPW Irrigation Areas for Phase I based on the actual percent area that will utilize NPW for irrigation. The Net NPW irrigation area values will be used for determining the NPW irrigation demands for this report. 7