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Table 1 <br />Soil Excavation Analytical Results Summary <br />July 22, 2020 Locomotive Diesel Release <br />Stockton, California <br />ARCADIS Design & Consultancy <br />for natural and <br />built assets <br /> <br />Approximate Sample <br />Sample ID Depth Sample Date <br />(inches bgs) <br />TPH <br />(C10-C22) <br />(mg/kg) <br />TPH TPH <br /> <br />(C22-C32) (C32-C40) <br /> <br />(mg/kg) (mg/kg) <br />SS-SW-N(230720) 21 7/23/2020 5.11 1.67J <4.46 <br />SS-SW-E(230720) 14 7/23/2020 2.84 J 9.60 7.18 <br />SS-SW-S(230720) 24 7/23/2020 9.19 J 42.6 33.2 <br />SS-SW-W(230720) 24 7/23/2020 5.26 J 30.5 32.9 <br />SS-FE-(230720) 30 7/23/2020 <5.19 <5.19 <5.19 <br />SS-FW-(230720) 36 7/23/2020 <4.69 <4.69 <4.69 <br />SFRWQCB ESL Diesel Motor Oil <br />Residential Shallow Soil Exposure' 260 12,000 <br />Commercial/Industrial Shallow Soil Exposure' 1,200 180,000 <br />Construction Worker Shallow Soil Exposure' 1,100 54,000 <br />Leaching to Groundwater (Drinking Water) 1,100 Not Established <br />Tier 1 Soil' 260 1,600 <br />Notes: <br />SFRWQCB. 2019. Environmental Screening Levels for Direct Exposure Human Health Risk Levels (Summary of Soil ESLs Table). <br />bgs = below ground surface (0 foot bgs samples were collected from first-encountered soil beneath ballast rock) <br />ESL = Environmental Screening Level <br />J = not detected; associated reporting limit is estimated <br />mg/kg = milligram per kilogram <br />SFRWQCB = San Francisco Regional Water Quality Control Board <br />TPH = total petroleum hydrocarbons <br /><5.19 = analyte not detected at or above laboratory reporting limit <br />Analytical Methods: <br />TPH (C10-C22, C22-C32, and C32-C40) following United States Environmental Protection Agency Method 8015. <br />Stkn ca_7.22.20 Loc Ds! Rls -Table 1 1/1