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k'9 KLEINFELDER <br /> 6 DISCUSSION OF FINDINGS <br /> 6.1 SOIL <br /> A total of twenty soil samples were submitted under chain-of-custody procedures to Sequoia <br /> Analytical Laboratory of Sacramento, California. Sequoia is a State of California Department of <br /> Toxic Substances Control (DTSC) certified laboratory for the analyses requested. Hydrocarbon- <br /> like odors and discoloration were present in soil samples collected at the five foot depth interval <br /> in EB-1/TW-1 and EB-2/TW-2. The soil in the five foot depth interval was noted with minor <br /> wood debris. Hydrocarbon-like odors were not noted from other soil samples collected. PID <br /> readings recorded from the samples collected ranged from 2.3 to 6.5 ppmv. <br /> A total of eight soil samples were analyzed, four from each of the two borings. The four soil <br /> samples submitted for analyses from each boring were collected at depths of 5, 20, 35, and 40- <br /> feet. These soil samples selected for analysis were based on PID readings, field observations, and <br /> the objectives of the scope of work. For additional information, see the laboratory data sheets <br /> and Chain-of-Custody records in Appendix D. <br /> The eight soil samples were analyzed for the following: <br /> • Total Petroleum Hydrocarbons as referenced to Diesel [TPH-D] and Lubricating Oil [TPH- <br /> LO], and/or any Unidentified Extractable Hydrocarbons [TPH-UEH] by EPA Method <br /> 3510/8015M) <br /> • Total Purgeable Petroleum Hydrocarbons as referenced to Gasoline [TPH-G] by EPA <br /> Method 8015M <br /> • Benzene, Toluene, Ethylbenzene, Xylenes [BTEX] by EPA Method 8020 or 602 <br /> • Total lead by EPA Methods <br /> The samples were analyzed on a normal laboratory schedule requiring approximately two weeks <br /> (ten working days). For a summary of the results obtained, please refer to Table 1 in Chapter 5 <br /> of this report. <br /> No purgeable hydrocarbons as referenced to gas or the gasoline constituents benzene, toluene, <br /> ethylbenzene, or xylenes (BTEX) were detected in the soil samples submitted for analyses. <br /> Unidentified extractable hydrocarbons (UEHs) were detected in both borings, EB-1/TW-1 and <br /> EB-2/TW-2, at a depth of 5-feet bgs in the C„ to C,o range. UEHs was detected at concentrations <br /> of 62.7 mg/kg and 13.5 mg/kg , respectively. Total lead was also detected at 30.7 mg/kg in the <br /> 20-3712-08.E01/2018R510 Page 10 of 16 <br /> © 1998, Kleinfelder, Inc. July 9, 1998 <br />