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TABLE I- Continued <br /> Analyte Matrix/Depth b s Concentration <br /> TPH-G Soil/15 . 0 ' 1400 ppm <br /> ' TPH--G Soil/20 . 0 ' 1200 ppm <br /> Benzene Soil/15. 0 ' N.D. <br /> Benzene Soil/20 . 0 ' N.D. <br /> 1 Toluene Soil/15 . 0 ' 6. 5 ppm <br /> Toluene Soil/20 . 0 ' 16 ppm <br />' Total Xylenes Soil/15. 0 ' 120 ppm <br /> Total Xylenes Soil/20. 0 ' 95 ppm <br /> Ethylbenzene Soil/15. 0 ' 14 ppm <br /> Ethylbenzene Soil/20 . 0 ' 14 ppm <br />' TPH-D. . .Total Petroleum Hydrocarbons as Diesel <br /> TPH-G. . .Total Petroleum Hydrocarbons as Gasoline <br /> bgs . . .Below ground surface <br />' ppm. . . Parts per million <br /> N.D. . . .Below the limits of laboratory detection ( i .e. < . 15 ppm) <br /> In order to acquire the additional information necessary to <br /> more thoroughly define the contaminant plume, calculate the <br /> volume and types of soils impacted, and design a cost effective, <br /> efficient, and appropriate remediation system, it is proposed <br /> that three additional soil borings be advanced at the locations <br /> specified in Figure 2 as EB-4 , EB-5, and EB-6 . Each of these <br />' borings would be advanced using a truck-mounted hydraulic drive <br /> drill rig equipped with 8" diameter, continuous flight, hollow <br /> stem augers; and logged in accordance with the Unified Soil <br /> Classification System. Auger lengths would be steam cleaned <br />' prior to being brought on site and between borings . Soil samples <br /> would be collected within a Modified California Split Spoon <br /> Sampler fitted with 1 . 9 inch diameter by 6 . 0 inch long brass <br />' sleeves . The sampler will be driven 18 inches into relatively <br /> undisturbed soil by a standard 30-inch drop of a 140 pound <br /> hammer. Discrete soil samples will be collected at five foot <br />' intervals , at apparent lithologic contacts, and at the <br /> vadose/saturated zone interface. Upon returning the sampler <br /> to grade, the split spoon will be opened and the sample sleeves <br /> removed. The ends of each sleeve will be promptly covered with <br />' teflon pads, capped with plastic, sealed with black electrical <br /> tape, marked, and placed on blue ice pending transportation <br /> to a certified laboratory under chain of custody. Selected <br />' 2 . <br />