ARCHIVED REPORTS_DRAFT - PHASE I REMEDIAL INVESTIGATION REPORT

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Kennedy/Jenks Consultants I • infrastructure (engine pit, turntable and two roundhouse structures) may have resulted in a release of organic compounds and metals. One boring was located in each of the following areas: ■ Engine pit ■ Turntable • Oil sump ■ Roundhouse (2 borings) Soil samples were collected at four depth intervals (generally 0 to 0.5 feet, 2 to 3 feet, 5 to 6 feet, and 10 to 11 feet bgs, modified as needed based on sample recovery), and analyzed for TPHd, TPHmo, VOCs, SVOCs, and Title 22 total metals. Boring OU2-A016-GW-3 was chosen for collection of a groundwater sample. The groundwater sample was analyzed for TPHd, TPHmo, and VOCs. • AOI 7 — Support: Five soil borings were advanced to assess whether undocumented operations associated with former oil storage and transmission infrastructure (including oil storage tanks and transmission pipelines; former railroad-related maintenance and repair facilities, such as the undesignated structures near the former track area; and possible waste management structures, such as settling tanks and a pump house) may have resulted in a release of organic compounds and/or metals. Boring was advanced in lie each of the following areas: ■ Settling tanks ■ Pump house • Oil storage tanks and transmission line ■ Support building area, near the tracks (2 borings) Soil samples were collected at up to four depth intervals (generally 0 to 0.5 feet, 2 to 3 feet, 5 to 6 feet, and 10 to 11 feet bgs, modified as needed based on sample recovery), and analyzed for TPHd, TPHmo, VOCs, SVOCs and Title 22 total metals. Boring OU2-A017-GW-1 was chosen for collection of a groundwater sample. The groundwater sample was analyzed for TPHd, TPHmo, and VOCs. • AOI 8 —Track. Two soil borings were advanced in this AOI to explore the potential for undocumented releases associated with the railroad tracks. Soil samples were collected at two depth intervals (generally 0 to 0.5 feet and 2 to 3 feet bgs, modified as needed based on sample recovery). Soil samples were analyzed for TPHd, TPHmo and Title 22 total metals. Groundwater sampling was not proposed in this AOI. i 2.1.3 Operable Units 3 and 4 Due to the historic presence of railroad tracks in these areas, soil borings were advanced in each of these OUs to explore the potential for impacts associated with railroad operations. Kennedy/Jenks advanced three soil borings in OU-3 and four soil borings in OU-4. Soil samples were collected at two depth intervals (generally 0 to 0.5 feet bgs and 2 to 3 feet bgs, modified as DRAFT Phase I Remedial Investigation Report Page 13 Former Tracy Railyard, Tracy, California g:lis-groupladminljob10510565771.18_uprr109-reportslri rptltextdoc