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ARROYO LAGO RESIDENTIAL PROJECT ADDENDUM FCS 187 Https://adecinnovations.sharepoint.com/sites/PublicationsSite/Shared Documents/Publications/Client (PN-JN)/2148/21480036/Addendum/21480036 Arroyo Lago Residential Project Addendum.docx including potential joint groundwater wells in coordination with Zone 7; however, at present, all water supplies are purchased from Zone 7.The Zone 7 2020 UWMP indicates that the district can meet retailer demands through normal, single dry, and multiple dry years.60 The proposed project would include construction of 189 single-family residential units and 48 junior ADUs, which would trigger substantially the same demand to that evaluated in the WSE, which analyzed 194 single-family residential units and 49 junior ADUs. The proposed project would have an estimated water demand of approximately 43 acre-feet per year (AFY), which is consistent with and slightly reduced from the water demand evaluated and disclosed in the County Project’s WSE (See Table 1 of the WSE).61 According to the City’s 2020 Urban Water Management Plan (UWMP), the City’s projected water demand during normal years is expected to increase from 18,240 AFY in 2025, to 20,036 AFY in 2045.62 Based on the projected water demand evaluated in the Prior FEIR for the County Project, this would equate to approximately 0.23 percent of the projected City water supply totals forecasted for the year 2045, with the proposed project likely constituting substantially the same, albeit a nominally lower, percentage. Consistent with the Housing Element Update Program EIR and subsequent water supply evaluations, this level of demand would be accommodated within the City’s diversified water supply portfolio, including Zone 7 contractual supplies, even under conditions where certain local groundwater sources remain unavailable. Furthermore, based on the City’s 2020 UWMP, the City would be able to fully serve its service area (existing and future users), as well as the proposed project, in normal, single dry and all multi-year drought scenarios, including the highest water demand scenario (5-year drought in 2045), which would result in an expected water demand of 20,036 AFY for the full service area of the City.63 As discussed above, the proposed project would produce a demand similar to, if not less than, the County Project, which estimates a total demand of 47 AFY. The 2020 UWMP projects that its total supply would meet the demand of the normal year scenario and that the purchased water and groundwater supply derived from the Zone 7 is expected to be able to meet the projected demands through 2045, even if there is a 5-year drought.64 Therefore, consistent with the Prior FEIR’s impact conclusions, impacts related to sufficient water supply availability would be less than significant. Thus, the proposed project would not introduce new significant impacts or create substantially more severe significant impacts than those previously identified in the Prior FEIR. No additional analysis is required. 60 Zone 7 Water Agency (Zone 7). 2021. 2020 Urban Water Management Plan. June. 61 The proposed project’s estimated water demand includes three components: residential water use, landscaping, and distribution system losses. The residential water demand calculation uses a factor of 52.3 gallons per capita per day (gpcd), multiplied by 588 residents, totaling approximately 30,752.4 gpd, or approximately 34.4 AFY. The proposed project’s estimated total water use from landscaping is approximately 5.89 AFY for the 3.7 acres of landscaped areas. This analysis also uses the same additional demand of 2.8 AFY for distribution system losses as the County Project’s WSE. Therefore, the proposed project would have a total annual water demand of approximately 43.09 AFY. 62 City of Pleasanton. 2021. 2020 Urban Water Management Plan. June. 63 Ibid. 64 Ibid.