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ARCADIS Phase II Field <br /> Investigation Work Plan <br /> Groundwater data collected during the last five years indicate that a dissolved-phase Union Pacific Railroad <br /> TEPH plume is present in the A-Zone, extending from the vicinity of the former TPCA Company <br /> Former Maintenance Facility <br /> pond excavation northeast approximately 850 feet. In March 2008,TEPH was not Tracy, California <br /> detected in wells MW-01 A, MW-04A, MW-05A, MW-13A, MW-12A, and MW-15A, <br /> defining the perimeter of the plume(see Figure 4),except to the east and southeast. <br /> Between these perimeter wells and the source area,there are few wells; additional <br /> wells in these transition zones(upgradient and downgradient)are necessary to <br /> complete the monitoring network. <br /> 1.3 Investigation Objectives <br /> The objectives of the Phase II Investigation are to complete the LPH delineation that <br /> was begun in June 2008 and to complete additional characterization of groundwater in <br /> areas of the plume where data are sparse(i.e., in the transition zones).The following <br /> objectives have been identified: <br /> • Delineate the extent of LPH to the east and west of the source area and in the <br /> vicinity of the track pan (see Figure 3); <br /> • Assess potential LPH sources associated with the suspected underground piping <br /> in the vicinity of the track pan area and the Engine House; <br /> • Assess potential impacts to groundwater from the former Toxic Pits Cleanup Act <br /> (TPCA)pond excavation; <br /> • Refine the delineation of the perimeter of the total extractable petroleum <br /> hydrocarbon (TEPH)plume, particularly along the upgradient edge; and <br /> • Assess TEPH distribution in the transition area groundwater between the source <br /> area and the perimeter of the plume. <br /> The Phase II investigation will include implementation of the following field activities: <br /> • Collecting lithologic data and screening unsaturated and saturated soil for LPH <br /> using CPT integrated with an LIF system; <br /> • Collecting lithologic data and groundwater samples using CPT/HydroPunchTM <br /> technology;and <br /> C.D­nts and SenngsUdaandt Local Se ingsJemporary Internet F,leslContenLCutlooK52SXLSSI`Ph 11 WP 0105_09(2).doc 2/6 <br />