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GEOMATRIX <br /> particulates. Duplicate samples from borings GB-4 and GB-5 were also analyzed without the <br /> laboratory filtering; a duplicate sample from GB-1 was not analyzed without laboratory <br /> ' filtering because of insufficient sample volume due to sample container breakage during <br /> transport to the laboratory. Sample extracts for TPHd analyses were cleaned up with silica gel <br /> ' by EPA Method 3630 prior to analyses to remove polar biogenic materials. <br /> Following sampling, the boreholes were grouted from the bottom to within three feet of the <br /> ' surface with cement-bentonite grout mixture. <br /> 4.0 ANALYTICAL RESULTS <br /> ' The following paragraphs describe the analytical results of the soil and groundwater samples <br /> collected during this investigation. The analytical results for soil and groundwater are <br /> summarized in Tables 1 and 2, respectively. <br /> ' Soil Samples <br /> TPHc was detected in three of the eight soil borings (GB-1, GB-2, and GB-3) at concentrations <br /> ' up to 3600 milligrams per kilogram (mg/kg). Benzene was not detected in any of the samples. <br /> Toluene, ethylbenzene, and xylenes were either not detected or were detected sporadically at <br /> ' low concentrations. Low concentrations of several PAHs were detected in samples from three <br /> of the eight soil borings (GB-1, GB-2, and GB-3). Soil analytical results are summarized in <br /> Table 1. <br /> ' Groundwater Samples <br /> No benzene was detected in the grab groundwater samples collected from any of the three <br /> sampling locations (GB-1, GB-4, and GB-5). Low concentrations of toluene, ethylbenzene, <br /> and/or xylenes were detected in the grab groundwater samples collected from two of the <br /> ' sampling locations. PAHs were only detected in the groundwater sample collected from GB-1, <br /> installed directly within the affected soil. The detected PAHs were acenaphthene (1.3 <br /> ' micrograms per liter [µg/1]), flourene (3.4 µg/1), pyrene (0.3 µg/1), and chrysene(0.2 gg/1). <br /> TPHg was detected only in the grab groundwater sample collected from GB-1 at a <br /> \\sf2\deptdata\Doc_Safe\4780\sur1drpt.doc 4 <br />