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Kennedy/Jenks Consultants <br /> • Table of Contents cont'd <br /> ' 5.7.4.1 Soil Borings............................................................34 <br /> 5.7.4.2 Trenches and Test Pits ..........................................34 <br /> ' 5.7.5 OU-5 Groundwater Samples ...................................................35 <br /> 5.7.5.1 Metals ....................................................................35 <br /> 5.7.5.2 Organic Compounds ..............................................35 <br /> ' 5.7.6 Extent of TPH in Groundwater AOI 10 Area ............................36 <br /> 5.8 Background Arsenic Concentrations ...................................................37 <br /> Section 6: Summary of Findings and Conclusions..................................... 39 <br /> ' 6.1 Operable Unit 1 ...................................................................................39 <br /> 6.1.1 OU-1 AOI 1 .............................................................................39 <br /> ' 6.1.2 OU-1 AOI 2 .............................................................................39 <br /> 6.1.3 OU-1 AOI 3 .............................................................................39 <br /> 6.1.4 Conclusions for OU-1 ..............................................................40 <br /> 6.2 Operable Unit 2...................................................................................40 <br /> ' 6.2.1 Metals....... .............................................................................40 <br /> 6.2.2 Volatile and Semivolatile Organic Compounds........................40 <br /> 6.2.3 TPH......... ..............................................................................40 <br /> 6.2.3.1 TPH in AOI 4..........................................................41 <br /> 6.2.3.2 TPH in AOI 5..........................................................41 <br /> 6.2.3.3 TPH in AOI 6..........................................................41 <br /> ' 6.2.3.4 TPH in AOI 7..........................................................41 <br /> 6.2.3.5 TPH in AOI 8..........................................................41 <br /> 6.2.4 Groundwater............................................................................41 <br /> 6.2.5 Conclusions for OU-2..............................................................42 <br /> 6.3 Operable Unit 3...................................................................................42 <br /> 6.4 Operable Unit 4...................................................................................42 <br /> 6.4.1 Findings..... .............................................................................42 <br /> 6.4.2 Conclusions.............................................................................43 <br /> 6.5 Operable Unit 5...................................................................................43 <br /> ' 6.5.1 Soil.......... ..............................................................................43 <br /> 6.5.2 Groundwater............................................................................44 <br /> 6.6 Site-Wide............................................................................................45 <br /> 6.6.1 Soil.......... ..............................................................................45 <br /> 6.6.2 Groundwater............................................................................46 <br /> 1 <br /> • <br /> DRAFT Phase I Remedial Investigation Report <br /> Former Tracy Railyard, Tracy, California <br /> g:lis-groupladminl ob10510565777.18_uprr109-reportsld rplllext.doc <br />