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Mr. Jeff Tierney September 2, 2020 also bagged and placed into the roll-off bins. Waste was staged onsite pending characterization for disposal at a UPRR-approved waste management facility. The seven roll-off bins are currently pending profile approval for disposal at Waste Connections, Potrero Hills Landfill in Potrero, California. Final waste manifests and associated weigh tickets will be provided to the SJCEHD and RWQCB under separate cover. SOIL SAMPLING On July 23, 2020, Arcadis collected six in-place soil samples from the excavation sidewalls and floor. The excavation was sloped from the east to west from approximately 26 inches to 36 inches bgs based on visual observations and PID measurements in the field. Four samples were collected from the north, east, south, and west side walls of the excavation (SS-SW- N, SS-SW-E, SS-SW-S, SS-SW-W) and two samples were collected from the east and west excavation floor (SS-FE and SS-FVV). The soil samples were collected into pre-cleaned laboratory supplied 4-ounce glass jars, capped, labeled, and placed in an ice-chilled cooler for delivery to Pace Analytical (Pace) in Mt. Juliet, Tennessee (a state-certified laboratory) under standard chain-of-custody procedures. The soil samples were analyzed for the following: Total petroleum hydrocarbons (TPH) — diesel range organics (DRO), Carbon Chain C10 to C22 by United States Environmental Protection Agency (USEPA) Method 8015B TPH — motor oil range organics (MO), Carbon Chain C22 to C32 and Carbon Chain C32 to C40 by USEPA Method 8015B Copies of the chain-of-custody, Pace analytical laboratory report, and validation memo are included in Attachment 2. DATA VALIDATION The analytical laboratory report was validated by GHD Inc. (GHD) in the Analytical Results and Reduced Validation of Report L1243673 Soil Sampling, dated August 11, 2020. Based on the GHD assessment, the data associated with this project was acceptable without qualification. Samples were prepared and analyzed within the required holding times. Analytical data and the data validation memorandum are included in Attachment 2 and tabulated in Table 1. SOIL SAMPLE ANALYTICAL RESULTS TPH-DRO (C10-C22) was detected at concentrations ranging from 2.84 milligrams per kilogram (ring/kg) in sample SS-SW-E(230720) to 9.19 mg/kg in sample SS-SW-S(230720). TPH-MO (C22-C32) was detected at concentrations of 1.67 mg/kg in sample SS-SW-N(230720) to 42.6 mg/kg in sample SS-SW- S(230720). TPH-MO (C32-C40) was detected at concentrations ranging from 7.18 mg/kg in sample SS- SW-E(230720) to 33.2 mg/kg in sample SS-SW-S(230720). TPH-DRO (C10-C22), TPH-MO (C22-C32), and TPH-MO (C32-C40) was not detected in either of the east or west floor soil samples. Analytical results are tabulated in Table 1. arcadis.com Page: 2020.09.02_Stktn_20.07.22 Loc Ds1 Rls_Sum Rpt_Draft 3/5