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k" KLEINFELDER five foot soil sample collected from EB-1/TW-1. No other analytes were reported from soil samples submitted for the aforementioned requested analyses. Because this soil was noted with minor wood and slight discoloration, it is suspected to be fill material. The depth interval range of the suspected fill material is estimated to be approximately 3 to 8 feet bgs. It is Kleinfelder's opinion that the contaminants (UEHs and total lead) found were likely imported and therefore probably not the result of nearby potential sources of contamination (i.e.: spills, leaks etc.). 6.2 WATER Two groundwater samples, one from each boring EB-1/TW-1 and EB-2/TW-2, and four water samples (2 each of trip and field blanks) were submitted under chain-of-custody procedures to Sequoia Analytical Laboratory of Sacramento, California. Sequoia is a State of California Department of Toxic Substances Control (DTSC) certified laboratory for the analyses requested. All six water samples were analyzed for one or more of the following: • Total Petroleum Hydrocarbons as referenced to Diesel [TPH-D] and Lubricating Oil [TPH- LO], and/or any Unidentified Extractable Hydrocarbons [TPH-UEH] by EPA Method 3510/8015M) • Total Purgeable Petroleum Hydrocarbons as referenced to Gasoline [TPH-G] by EPA Method 8015M • Benzene, Toluene, Ethylbenzene, Xylenes [BTEX] by EPA Method 8020 or 602 • Total lead by EPA Methods The samples were analyzed on a normal laboratory schedule requiring approximately two weeks (ten working days). For a summary of the results obtained, please refer to Table 2 in Chapter 5 of this report. Total petroleum hydrocarbons as referenced to gasoline (TPH-G) were detected in the groundwater sample collected from temporary well EB-1/TW-1 at a concentration of 62.4 µg/1. UEHs were reported at 0.130 mg/l and 0.262 mg/l, respectively, from groundwater samples collected from temporary wells TW-1/EB-1 and TW-2/EB-2. No other analytes were detected in the two groundwater samples at or above laboratory reporting limits. The UEHs found in groundwater may be a result of cross contamination. It is Kleinfelder's opinion that the TPH-G found in groundwater is likely the result of an unknown offsite source. The field and trip blanks submitted for analyses during sampling of groundwater from temporary well EB-2/TW-2 contained non-detectable concentrations of the requested analytes. However, toluene was detected in the field and trip blank collected during the groundwater sampling of 20-3712-08.E01/2018R510 Page 1 I of 16 © 1998, Kleinfelder, Inc. July 9, 1998