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2. Background Relevant background information is provided below, including a general description of the Site; a brief review of the Site's history with respect to hazardous material use, handling, and/or storage; and a review of known and potential releases of hazardous substances at the Site. The Site is located at 1320 W Weber Avenue in Stockton, California (Figure 1).The Site comprises Assessor Parcel Number(APN) 145-190-22, and shares its address with the west-adjacent parcel,APN 145-190-21. The Site is 3.9 acres, is currently developed with a single industrial warehouse structure, and is utilized for cold storage operations. The Site is proposed for industrial redevelopment with an industrial cold storage warehouse structure and surrounding at grade asphalt parking area. Adjacent sites include a Superfund site which historically operated as a creosoting plant from 1946 to 1991 and has been on the NPL since 1992, with pentachlorophenol (PCP), carcinogenic polycylic aromatic hydrocarbons (PAHs), dioxin/furans, and arsenic given as the primary constituents of concern after several rounds of soil and groundwater sampling. The primary threat to human health (as noted by the USEPA in their 2023 Five-Year Review) is incidental ingestion and dermal absorption by on-site workers exposed to contaminated soil.Additionally, a 2017 investigation indicated that naphthalene (7,800 pg/L) was present in groundwater beneath the Subject Property in quantities exceeding its Commercial ESL, and PAH of acenaphthene exceeding its Tier 1 ESL as a result of historical operations at this site. Other adjacent sites include facilities with closed leaking underground storage tanks (LUST) cases. Investigations at these facilities presented historical impacts of total petroleum hydrocarbons as gasoline(TPH-g), benzene,toluene, ethylbenzene, and total xylenes (BTEX)to groundwater. 5175.0001S102/HSP Site-Specific Health and Safety Plan I ROUX 17