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November 8, 2024 Page 28 7357-013acp printed on recycled paper Code, the County must request that the water district prepare a WSA for the projects and include it for public comment in the Draft EIR. There is also evidence in the record that the existing water supply from the local water district may not be adequate to serve the Arroyo Lago Project, let alone the Senior East County Lakes Project. In 2022, the California Water Service Company Livermore District (“Cal Water”) provided the County with a will-serve letter for the Arroyo Lago Project based on the Project’s plan to drill wells on site and equip them with necessary water storage and booster pumps.140 However, Cal Water retracted the will-serve letter in October 2023, explaining: Cal Water has not evaluated the forecasted water system needs of this development, the ability of Zone 7 to serve this new development under the existing Cal Water contract, nor conducted a review of the water system evaluation of this new development. As such, all claims in the documentation regarding the availability of water for the development have not been validated by Cal Water, the future water purveyor for this development.141 The Cal Water letter stated that, as of October 2023, Cal Water was working with USL Pleasanton Lakes, L.P. to develop a Letter of Agreement (“LOA”) to provide water service to the Arroyo Lago Project, but that the LOA was still under negotiation.142 The addition of the 569-unit Senior East County Lakes Project will substantially expand the water supply needs at the Project site, and may require significant changes to the LOA Cal Water is considering. The Projects’ cumulative water supply needs must be quantified and discussed in the WSA and EIR. 2. Hazardous Materials / Soil Contamination A portion of the Project site was formerly an aggregate mining facility and is undergoing ongoing regulatory cleanup for hazardous substances under the supervision of the Alameda County Department of Environmental Health (“ACDEH”).143 The current site status is listed as “OPEN - LONG TERM MANAGEMENT AS OF 7/18/2017.”144 In October 2022, ACDEH responded to the Arroyo Lago Project application by explaining that site closure would be dependent 140 Exhibit E – Letter from California Water Service to Alameda County re Will Serve Tract or Parcel Map No: PM 11230 Owner: USL Pleasanton Lakes, L.P. (11/11/2022). 141 Exhibit F, Letter from California Water Service to Alameda County re Case No.: PLN2022-00193 (10/12/2023) 142 Id. 143 See Exhibit G, Geotracker, USL Pleasonton Lakes, available at https://geotracker.waterboards.ca.gov/profile_report?global_id=T10000009398 (visited 9/10/24). 144 Id.