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24 May 2021 <br />Project No. 14-3002 <br />Page 2 of 23 <br /> <br />1.2. CHEMICALS OF CONCERN <br /> <br />The chemicals of concern (COC) at the Site include Polychlorinated biphenyls (PCBs), <br />dioxin/furan compounds (dioxins), total petroleum hydrocarbons (TPH) and total lead <br />(Pb). The primary COC is PCB Aroclor 1254; no other PCB Aroclor was detected at the <br />Site. Buried glass processing waste encountered at the Site is the source of the COCs. <br />Glass waste was handled, stored, and buried at the Site prior to development of the <br />property. <br /> <br />Samples collected from the Site were also analyzed for Title 22 metals (total, soluble and <br />dissolved), hexavalent chromium (dissolved), semi-volatile organic compounds (SVOCs), <br />polycyclic aromatic hydrocarbons (PAHs), volatile organic compounds (VOCs), nitrates, <br />total ammonia, and total dissolved solids (TDS). These chemicals are not considered Site <br />COCs based on low to non-detect concentrations and regional levels (nitrates and TDS). <br /> <br /> <br />1.3. BRIEF SUMMARY OF PCB IMPACTS <br /> <br />PCBs were detected at the Site from surface grade to ten feet bsg in waste samples and <br />soil samples collected directly above or beneath waste. PCBs were not detected in <br />groundwater samples collected at the Site. PCB Aroclor 1254 was the only congener <br />detected in the samples. Aroclor 1254 was detected at maximum concentrations of <br />48 milligrams per kilogram (mg/kg) at three feet bsg, 100 mg/kg at five feet bsg and <br />320 mg/kg at seven feet bsg in the former power plant area (Facility). Maximum PCB <br />concentrations increased with depth starting at three feet bsg. However, the vertical <br />extent of PCB contamination is defined and does not extend beyond 12 to 15 feet bsg. A <br />total of 20 soil and waste samples collected between three and ten feet bsg in the Facility <br />exceeded the May 2020 EPA Region 9 Regional Screening Level for industrial soil (RSLs) <br />of 0.97 mg/kg. PCBs were detected below the RSL in all the surface samples collected. <br />The data indicates the source of PCB impact is the glass processing waste disposed on <br />the Site. <br /> <br /> <br />1.4. PROPOSED CLEANUP OPTIONS AND SCHEDULE <br /> <br />There is currently no proposed remediation option or schedule for the Site. The future <br />plans for the subject property involve redevelopment for industrial use. However, no <br />specific plans have been developed as of the date of this report. AGI anticipates the <br />proposed remediation plan will consist of a combination of waste removal and disposal <br />and capping and maintaining waste in place. Once the Site has been fully characterized <br />and a development plan has been proposed, a cleanup option that is specific to the <br />subject property will be selected. The remediation will adhere to Title 27 California Code <br />of Regulations (CCR), Section 21810 for clean closure of a pre-regulation solid waste <br />disposal site and/or Title 27 CCR Section 21190 for post closure land use of a solid waste <br />disposal site.