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6 ANALYTIC RESULTS Page 9 <br /> 6.1 SOIL ANALYSIS <br /> The soli sample analysis is summarized in Table 3 The soil samples for borings B-2 and B-3 <br /> (MW-5 and MW-6) were below detection lunits (ND) for total petroleum hydrocarbons as gasoline <br /> (TPH-g) Borehole B-1 samples in the depth range from 15 5 - 35 5 feet BGS, contained TPH-g <br /> up to 17 parts per million (ppm), benzene to 190 parts per billion (ppb), toluene to 90 ppb, <br /> ethylbenzene to 22 ppb and total xylenes up to 780 ppb <br /> The detection limit for TPH-g in soil is 10 mg/Kg (ppm), and the detection limit for each <br /> component of BTEX is 0 005 mg/Kg Any measurement at or below these limits is uncertain and <br /> should be considered non-detectable (ND) <br /> 6.2 GROUNDWATER ANALYSIS <br /> The groundwater sample analysis is summarized in Table 4 Analyses of the groundwater <br /> monitoring well water in MW-3, MW-4 and MW-6 detected the presence of TPH-g, benzene, <br /> toluene, ethylbenzene and total xylenes at levels as high as 15,000 ppb, 5,400 ppb, 2,700 ppb, 60 <br /> ppb, and 1,700 ppb, respectively Groundwater samples were below detection limits (ND) for all <br /> analyses in MW-5 Groundwater samples were below detection limits (ND) for lead in each well <br /> Detection limit for TPH-g in water is 50 gg/L (ppb), and the detection limit for each component of <br />' BTEX in water is 0 5 µg/Kg Any measurement at or below these limits is uncertain and should <br /> be considered non-detectable (ND) <br /> 1 <br /> 1 <br /> r <br /> 100 Shoreline Hwy, Suite 295 $ • Mill Valley, CA 94941 • (415) 381-6456 FAX (415) 389-0423 <br /> r <br />