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Kennedy/Jenks Consultants <br /> ' in three samples collected from 10 feet bgs were slightly higher than in the samples collected <br /> from 5 feet bgs in the same boring. <br /> The only visible or olfactory indications of TPH impact in AOI 5 was hydrocarbon odor observed <br /> at 11 feet bgs at Boring OU2-A015-S2 (see Appendix A). The concentrations of TPHd and <br /> TPHmo in sample OU2-A015-S-2-10/11 were 720 mg/kg and 1,400 mg/kg, respectively, greater <br /> than concentrations in the sample collected from 5 feet bgs (2.8 mg/kg of TPHd and <50 mg/kg <br /> of TPHmo). <br /> As show in Table 7, the only VOC detected at concentrations exceeding analytical reporting <br /> limits was acetone in samples from the "replacement" borings. The only SVOC detected was <br /> phenol at 0.35 mg/kg in sample OU2-A015-S-4-10/11. The detected concentrations of acetone <br /> and phenol are less than the respective residential PRGs. <br /> The analytical results indicate that hydrocarbons have been released in AOI 5. The highest TPH <br /> concentrations were observed in shallow soil, however, TPH was present at elevated <br /> concentrations at a depth of 10 feet bgs in Boring OU2-A015-S2. <br /> 5.4.4 OU-2 AOI 5 Groundwater Sample <br /> A groundwater sample was collected from Boring OU2-A015-S1 and analyzed for TPHd, <br /> TPHmo, and VOCs. As shown in Table 8, the sample contained TPHd at a concentration of <br /> 200 pg/1. TPHmo and VOCs were not detected at concentrations exceeding analytical reporting <br /> limits. <br /> 5.4.5 OU-2 AOI 6 Soil Samples <br /> As described in Section 2, AOI 6 includes the former roundhouse area, including the turntable, <br /> ' engine pit, and various former structures. Soil samples collected from AOI 6 were analyzed for <br /> Title 22 metals, TPHd, TPHmo, VOCs, and SVOCs. <br /> ' 5.4.5.1 OU-2 AOI 6 Soil Samples — Metals <br /> Analytical results for the Title 22 metals are summarized in Table 6 with the respective PRG and <br /> CHHSL comparison values. Beryllium, selenium, and thallium were not detected at <br /> concentrations exceeding analytical reporting limits in any of the 19 soil samples collected in <br /> AOI 6. Silver was detected at a low concentration in one sample. As in other area of OU-2, <br /> arsenic was detected in the 19 soil samples collected from AOI 6 at concentrations ranging from <br /> 4.7 to 17 mg/kg. <br /> The lead concentration in sample OU2-A016-S-3-0/0.5 (1,400 mg/kg) exceeded the PRGs but <br /> ' not the industrial CHHSL. The concentrations of antimony, copper, silver and zinc in this sample <br /> were the highest observed among the soil samples collected from OU-2. This sample also <br /> contained 16 mg/kg of arsenic. The antimony, copper, and zinc concentrations in this sample <br /> ' did not exceed the respective PRGs or CHHSLs. <br /> • <br /> DRAFT Phase I Remedial Investigation Report Page 26 <br /> Former Tracy Railyard, Tracy, California <br /> g:\is-group\admin\job105\0565777.18_uprr\09-reports\ri rpt\text.doc <br />