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Kennedy/Jenks Consultants <br /> 5.4.8 OU-2 AOI 7 Groundwater Sample <br /> A groundwater sample was collected from Boring OU2-AOI7-S1. Visual indications of <br /> hydrocarbon impact were not noted in the soil core from this boring, however as shown in <br /> Table 8, TPHd and TPHmo were detected in the groundwater sample at concentrations of <br /> 2,000 pg/I and 1,900 pg/I, respectively. PCE was detected at a concentration of 0.61 pg/1, less <br /> than the MCL of 5 pg/l. An MCL has not been established for TPH compounds. <br /> 5.4.9 OU-2 AOI 8 Soil Samples <br /> Two soil borings were advanced in AOI 8 to evaluate the potential for releases associated with <br /> the railroad tracks. Soil samples collected from AOI 8 were analyzed for Title 22 metals, TPHd, <br /> 1 and TPHmo. <br /> 5.4.9.1 OU-2 AOI 8 Soil Samples — Metals <br /> As shown in Table 6, beryllium, molybdenum, selenium, silver, and thallium were not detected <br /> at concentrations exceeding analytical reporting limits in the four samples collected from AOI 8. <br /> Antimony and mercury were detected in two samples at concentrations less than residential <br /> CHHSLs and PRGs. Cadmium concentrations in three samples slightly exceeded the residential <br /> CHHSL but not the residential PRG. The concentration of lead in two samples exceeded the <br /> residential PRG and CHHSL. Arsenic concentrations in these four samples ranged from 3.1 to <br /> 14 mg/kg. <br /> Concentrations of the other nine metals did not exceed residential CHHSL values. <br /> 5.4.9.2 OU-2 AOI 8 Soil Samples — Organic Compounds <br /> TPHd and TPHmo were detected in both samples from Boring OU2-AO18-S1 and the surface <br /> sample from Boring OU2-AOI8-S2. The maximum concentrations were detected in the surface <br /> sample collected from Boring OU2-AO18-S2. <br /> 5.5 Operable Unit 3 <br /> During this investigation, three borings were advanced in OU-3 to evaluate the potential <br /> chemical impact associated with railcar operations. Two soil samples were collected from each <br /> boring and were analyzed for lead, arsenic, TPHd, and TPHmo. The analytical results are <br /> summarized in Table 9. <br /> One of the six soil samples (OU3-S1-S-0/1) contained lead at a concentration of 410 mg/kg, <br /> exceeding the residential PRG and CHHSL values, but less than the industrial PRG and CHHSL <br /> values. Concentrations of lead in the remaining five samples were less than PRG and CHHSL <br /> values. In each of the three soil borings, the highest concentrations of lead were found in the <br /> surface soil samples. With the exception of the surface soil sample collected from <br /> Boring OU3-S1, which contained arsenic at a concentration of 68 mg/kg, arsenic was detected <br /> at concentrations similar to those found in soil in OU-2. <br /> DRAFT Phase I Remedial Investigation Report Page 29 <br /> Former Tracy Railyard, Tracy, California <br /> g:1is-group\adminljob10510565777.18_uprr109-reportslri rpt\textdoc <br />