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15 September 2020 AdvancedGeo p Project No. 18-4357 An Employee -Owned Company Page 2 of 4 The soil sample was analyzed for the following constituents: • Total petroleum hydrocarbons quantified as gasoline, diesel, and motor oil (TPH-g, TPH-d, TPH-mo) in accordance with EPA Method 8015B. • Chromium and lead for Total Threshold Limit Concentration (TTLC) and analysis in accordance with EPA Method 6010B. • Chromium for Soluble Threshold Limit Concentration (STLC) analysis in accordance with EPA Method 6010B. JANUARY 2019 On 17 January 2019, a total of four (4) soil samples were collected from the sidewalls of the S-5 excavation area at two (2) feet bsg as directed by EHD email dated 09 January 2019. Soil samples were collected and preserved in the same manner as described above. The soil samples were transported to ECI and analyzed for the following constituents as directed by EHD email dated 16 January 2019: • Chromium and lead for TTLC and STLC (if necessary) analysis in accordance with EPA Method 6010B. 2.0. FINDINGS Analytical results of soil samples are summarized in Table 1. The laboratory reports (Enviro Chem, Inc. Lab I.D.: 181212 and 190118), quality assurance/quality control reports and chain of custody forms are included in Appendix A. Below is a summary of the results: DECEMBER 2018 TPH were not detected above laboratory reporting limits in confirmation soil sample CS -5.5. Chromium and lead were detected at concentrations of 76.3 milligrams per kilogram (mg/kg) and 4.92 mg/kg, respectively. The chromium concentration was consistent with the other samples collected at the site and the STLC result for chromium (0.061 mg/1) was significantly below the hazardous waste level of 5.0 mg/1. Concentrations of chromium and lead were significantly below the June 2020 Human Health Risk Assessment (HHRA)-Note 3 environmental screening levels for commercial properties, published by the California Department of Toxic Substance Control (DTSC- SLs). The DTSC-SLs were established as the clean-up goals for the site per the EHD in an email dated 26 July 2018.