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Kennedy/Jenks Consultants <br /> iTotal lead was detected at concentrations above the residential PRG in samples <br /> OU2-A016-S-3-1.4/2.4, OU2-AO16-S-4-0/0.5, and OU2-AO16-S-5-0.8/1.8. The lead in these <br /> samples did not exceed the commercial or industrial PRG or CHHSL. <br /> Cadmium concentrations in nine samples were equal to or greater than the residential CHHSL, <br /> but less than industrial CHHSL and PRG values. The other detected metals concentrations <br /> were less than comparison values. <br /> Numerous metallic fragments and gravels were observed in the core from Boring OU2-AO16-S1. <br /> ' This boring was located at the former turntable location and mechanical refusal occurred at a <br /> depth of 8 feet bgs. The base of the former turntable may have been encountered. The metallic <br /> and granular debris recovered in the soil core may suggest that the turntable was filled in at <br /> some point in the past. <br /> 5.4.5.2 OU-2 AOI 6 Soil Samples — Organic Compounds <br /> Analytical results for organic compounds are summarized in Table 7, which includes samples <br /> from the original borings and "replacement' Borings OU2-A016-S3-R, OU2-AO16-S4-R, and <br /> OU2-AO16-S5-R. These borings were drilled to collect samples for VOC analysis only. <br /> TPH was detected in samples from each of the five AOI 6 borings. The highest TPH <br /> concentration in Boring OU2-AO16-S1 was found in a sample collected from 4 feet bgs but in <br /> other borings, the highest TPH concentrations were found in the surface sample or the sample <br /> collected from a depth of approximately 1 to 2 feet bgs. The highest concentrations were <br /> 820 mg/kg of TPHd and 2,500 mg/kg of TPHmo detected in sample OU2-A016-S-5-0.8/1.8. <br /> TPH concentrations increase with depth in Boring OU2-AO16-S1; however that boring was <br /> terminated at mechanical refusal (possibly the bottom of the turntable) at a depth of 8 feet bgs, <br /> and so a deeper sample could not be collected. <br /> As shown in Table 7, the VOCs 1,3-dichlorobenzene, 1,4-dichlorobenzene, methylene chloride, <br /> naphthalene, and PCE were detected in sample OU2-AO16-S-4-0/0.5, all at concentrations well <br /> 1 below the respective residential PRGs. The SVOCs pyrene and benzo(b)fluoranthene were <br /> detected in sample OU2-AO16-S-4-1/2 also at concentrations less than the respective PRGs. <br /> The SVOC butyl benzyl phthalate was detected in sample OU2-A016-S-5-5/6 at a concentration <br /> less than its PRG. <br /> The results indicate that hydrocarbons have been released in AOI 6. The greatest TPH <br /> concentrations were observed in shallow soils. The vertical extent of the TPH encountered in <br /> Boring OU2-A016-S1 is probably limited by the obstruction at 8 feet bgs. The few VOCs and <br /> SVOCs that were detected at concentrations exceeding analytical reporting limits were present <br /> iat concentrations less than residential PRGs. <br /> 5.4.6 OU-2 AOI 6 Groundwater Sample <br /> ' A groundwater sample was collected from Boring OU2-A016-S3 and analyzed for TPHd, <br /> • TPHmo, and VOCs. As shown in Table 8, TPHd was detected at a concentration of 130 pg/I. <br /> TPHmo and VOCs were not detected at concentrations exceeding analytical reporting limits. <br /> DRAFT Phase I Remedial Investigation Report Page 27 <br /> Former Tracy Railyard, Tracy, California <br /> g:lis-group\admin\jobk05\0565777.18 uprr109-(eportslri rptltext.doc <br />