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The groundwater-grab sample collected at approximately 44 feet bgs from G-6 contained 260 µg11 <br /> of TPH-as-diesel, 0 7 µg11 of benzene, 0 6 µg11 of toluene, 1 1 4g11 of ethylbenzene, and 1 9 µg11 of <br /> xylenes TPH-as-gasoline, the five oxygenate compounds and 1,2-DCA were not detected in this <br /> ' second-groundwater sample The reporting limit for TPH-as-gasoline was elevated to 500 µg11, <br /> due to the presence of sediment in the sample These groundwater-grab sample analytical <br /> results are summarized in Table 2, and the laboratory reports are included in Appendix D <br /> From the six groundwater-grab samples collected from first-groundwater beneath the site four <br /> 9 9 p g , <br /> contained detectable concentrations of TPH-as-diesel and/or TPH-as-gasoline The highest <br /> concentration of TPH-as-diesel was detected in G-10 at 750 µg11, and the highest concentration of <br /> TPH-as-gasoline was detected in G-8 at 2,400 µg11 The groundwater-grab sample collected from <br /> G-8 was also the only first-groundwater sample to contain toluene (1 1 µg11), ethylbenzene (49 <br /> pgll), and xylenes (0 6 µg11) Benzene, the five oxygenates and 1,2-DCA were not detected in any <br /> of the groundwater samples collected from the six first-groundwater borings These groundwater- <br /> grab sample analytical results are summarized in Table 2, and the laboratory reports are included <br /> in Appendix D Some of the reporting limits for TPH-as-diesel and TPH-as-gasoline for these <br /> samples were also elevated, due to sediment in the samples <br /> The groundwater samples collected from all three of the groundwater monitoring wells contained <br /> detectable concentrations of petroleum hydrocarbons The highest concentrations were detected <br /> in the groundwater sample collected from MW-1 5,100 µg11 of TPH-as-diesel, 6,500 µg11 of TPH- <br /> as-gasoline, 28 µgll of benzene, 1,100 µg11 of ethylbenzene, and 51 µg11 of xylenes The five <br /> oxygenate compounds and 1,2-DCA were not detected in any of the monitoring well groundwater <br /> ' samples The groundwater analytical results are also summarized in Table 2, and the laboratory <br /> reports are included in Appendix D <br /> 13 <br />