ARCHIVED REPORTS_2021 CURRENT CONDITIONS RPT

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24 May 2021 Project No. 14-3002 Page 8 of 23  TPH-gasoline (TPH-g): 2,000 mg/kg.  TPH-diesel (TPH-d): 1,200 mg/kg.  TPH-motor oil (TPH-mo): 180,000 mg/kg. Groundwater impacted with PCBs, dioxins, and Pb was evaluated using the October 2018 State of California Maximum Contaminant Levels for drinking water (MCLs); and groundwater impacted with TPH was evaluated using the MCL Priority listed in the ESLs. The MCLs are listed below:  PCBs: 0.5 micrograms per liter (µg/l).  Dioxins: 30 picograms per liter (pg/l).  Lead (Pb): 0.015 milligrams per liter (mg/l).  TPH-g: 760 µg/l.  TPH-d: 200 µg/l.  TPH-mo: no MCL listed. 2.8.1. Areas of Concern Investigations performed at the Site identified two Areas of Concern (AOCs): 1) the area along the eastern property boundary, south of the former power plant (East Property Boundary or AOC1); and 2) the location of the former cogeneration power plant (Facility or AOC2). Glass processing waste was encountered beneath both AOCs. AOC1 Soil and waste are impacted with PCBs, dioxins, and Pb at maximum concentrations of 1.0 mg/kg, 17.6 pg/g, and 6,400 mg/kg, respectively; the maximum concentrations were detected in the waste samples. Maximum concentrations detected in soil were 0.082 mg/kg of PCBs, 0.0149 pg/g of dioxins, and 15.8 mg/kg of Pb. Dioxins were detected below the RSL of 22 pg/g; one waste sample exceeded the RSL of 0.97 mg/kg for PCBs; and lead was detected significantly above the RSL of 800 mg/kg in one waste sample. However, the next highest Pb concentration detected in the 15 soil and waste samples collected from AOC1 was 69.5 mg/kg. Groundwater is not impacted with the COCs. Furthermore, Pb was not detected above the laboratory reporting limit of 0.002 mg/l (B18-Water) in the groundwater sample collected beneath the waste sample with the elevated Pb concentration (6,400 mg/kg).