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Kennedy/Jenks Consultants may be greater than 0.015 mg/I. The area was backfilled within 1 foot of the original grade with excavated soil containing stabilized lead. The remaining excavated depth was backfilled with clean imported fill material. • AOI 3 — Residual Elevated Lead. This area includes three discrete areas along the perimeter of Area 2 where soil samples collected from test pits indicated that lead concentrations in soils remaining in-place may be above the 220 mg/kg remediation goal and/or soluble extract concentrations may be greater than 0.015 mg/I. No remedial soil excavation has been conducted in these areas. 1.4.2 Operable Unit 2 OU-2 consists of approximately 16 acres occupying the western portion of the Railyard, bounded on the north by the railroad right-of-way that separates OU-2 from OU-4, on the east by the extended alignment of East Street that serves as the boundary with OU-1, on the south by Fourth Street, and on the west by the railroad right-of-way that separates OU-2 from OU-3 (Figure 2). Based on inspection of the historic valuation map provided by Union Pacific (Figure 3) as well as historic aerial photographs, OU-2 appears to have been the primary industrial area of the Railyard. Aerial photographs show that three ponds were previously located in this area. No information on past uses of the ponds was found. Observations during a recent site visit, in comparison with aerial photography, indicate the former ponds have been filled with soil and concrete debris. Oil storage and transmission infrastructure were located in OU-2, including one large oil tank (believed to be aboveground), an oil pump house, grass swale, railroad tracks, and various oil drains, oil pipes, air pipes and water pipes (all believed to be underground). Given the proximity of these facilities to the ponds, it is possible that the ponds were used for waste disposal or storage. OU-2 also had a roundhouse area that included one turntable, two roundhouse structures, an engine pit, oil sump, tool house, store house, railroad tracks and associated oil pipes. Other facilities included settling tanks, pump houses, lumber shed, store houses, storage tanks, power house, personnel offices/housing, railroad tracks, and various oil pipes, air pipes, and water pipes. There has been no prior subsurface investigation of OU-2. For purposes of the RI, the OU has been subdivided into five AOls based on former uses (refer to Figure 2): • AOI 4— Ponds.This area is comprised of the three former ponds that are currently backfilled with soil and concrete debris. • AOI 5— Oil Tank. This area includes the large oil tank and adjacent facilities, including an oil pump house, grass swale, railroad tracks, and various oil drains, oil pipes, air pipes, and water pipes. Remedial Investigation Work Plan Page 6 Former Tracy Railyard, Tracy, California gags-grouplz&NnWb10510565777.03_uprt10&reportslwork plan4i 6naPWAdoc