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3.0 IDENTIFICATION OF ALL PAST AND CURRENT SOURCES OF CONTAMINATION Discussions of the methods used to research and investigate the potential or known above and belowground sources of contamination at the project site. The following sources of information have been utilized during the completion of this report: • Site owner provided environmental documents pertaining to the Site, including various historical resources(aerial photographs, topographic maps and city directories). • Technical reports pertaining to the Site available on the State of California Water Resources Control Board Geotracker database/system. • San Joaquin County Environmental Health Department (EHD) and Central Valley Regional Water Quality Control Board (RWQCB) issued no further actions letters and closure summaries pertaining to the Site. • Correspondence pertaining to the Site from the California Department of Conservation Geologic Energy Management Division. • Publicly available environmental databases (Federal, State, Tribal and local government). • Visual observations of the Site and surrounding properties. • Interview with the Site owner. Description of all past on-site potential and/or known above and below ground sources of contamination identified at the project site. The former use of the Site as a sugar refinery included various infrastructure that resulted in certain above and below ground potential and known sources of contamination. These features were decommissioned, assessed and mitigated to the satisfaction of three different regulatory agencies. Potential and known impacts identified at the Site included the following: • Minor spills of chemical products associated with former Site operations. • Generation of hazardous waste and use of hazardous materials associated with former Site operations. • A release of No. 6 fuel oil to the ground surface from a former 420,000-gallon aboveground storage tank(AST) • Releases of petroleum hydrocarbons from multiple former underground storage tanks (UST) and residual subsurface impacts of media including soil, soil gas and groundwater. • Former waste water treatment ponds in the northern portion of the Site. • The former present of a dry gas well at the Site. Description of all current on-site potential and/or known above and below ground sources of contamination identified at the project site Current uses of the Site are not indicative of nor have to potential to result in above and below ground potential or known sources of contamination. Surface and Subsurface Contamination Evaluation February 9,2026 Parcel Map 17017,Tracy,California Page 3 of 7