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4 Environmental Analysis 4.9 Hazards and Hazardous Materials 4.9.1.1 Soil and Groundwater Contamination In California, regulatory databases listing hazardous materials sites provided by numerous federal, state, and local agencies are consolidated in the "Cortese List" pursuant to Government Code Section 65962.5, effective in 1992. However, subsequent changes in web-based information availability since that time have made a consolidation of this list no longer necessary, and the databases are maintained on an individual basis by the following responsible agencies: • List of Hazardous Waste and Substances sites from Department of Toxic Substances Control (DTSC) EnviroStor database; • List of Leaking Underground Storage Tank Sites by County and Fiscal Year from the State Water Resources Control Board (SWRCB) GeoTracker database; • List of solid waste disposal sites identified by the SWRCB with waste constituents above hazardous waste levels outside the waste management unit; • List of "active" Cease and Desist Orders and Cleanup and Abatement Orders from the SWRCB; and • List of hazardous waste facilities subject to corrective action pursuant to Section 25187.5 of the Health and Safety Code, identified by the DTSC and listed on its EnviroStor database. The five databases cited above identify sites with suspected and confirmed releases of hazardous materials to the subsurface soil and/or groundwater. The DTSC EnviroStor database includes federal and state response sites; voluntary, school, and military cleanups and corrective actions; and permitted sites. The SWRCB GeoTracker database includes leaking underground storage tanks (LUST), permitted underground storage tanks (UST), U.S. Department of Defense sites, and Cleanup Program sites. The reporting and statuses of these sites change as identification, monitoring, and cleanup of hazardous materials sites progress. Typically, a listed site is no longer considered to be of concern once it has been demonstrated that existing site uses, combined with the levels of identified contamination present, are determined not to be a significant risk to human health or the environment and the case is closed by the overseeing agency. According to a review of the GeoTracker database, the Project site is not included as an active LUST site or a Cleanup Program site. There are two LUST sites within 1 mile of the Project site, one located approximately 0.25 mile west of the Project site and one located approximately 0.9 mile northeast of the Project site. Both sites are listed as "Completed—Case Closed." There are also two Cleanup Program sites located approximately 0.8 mile and 1.1 miles north of the Project site. Both sites are also listed as "Completed—Case Closed." The closest open case is a LUST Cleanup site located approximately 2.3 miles northwest of the Project site (SWRCB 2022). The Project site is not expected to have been adversely affected by migration of hazardous materials through groundwater from this site. According to a review of the EnviroStor database, the Project site is not located on any federal or state response site; voluntary, school, and military cleanup and corrective action site; or permitted site. The closest EnviroStor site or facility to the Project site as listed in this database is an active federal Superfund site located approximately 3.5 miles to the south (DTSC 2022). Griffith Energy Storage Project 4.9-2 Tetra Tech/SCH 2022120675 Draft Environmental Impact Report August 2023