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ARCADIS Phase II Field Investigation Work Plan • Installing and sampling monitoring wells. Union Pacific Railroad Company Former Maintenance Facility Field activities will be conducted in phases beginning with LIF, and followed by Tracy,California CPT/HydroPunchTm and monitoring wells.Additional LIF and CPT/HydroPunchTM locations will be drilled until the investigation objectives have been met and the data gaps are filled. The locations of the monitoring wells will be based on data from the first LIF and CPT/HydroPunchTM phases. Borings and monitoring wells will be installed under this Work Plan until the objectives stated in this Work Plan are satisfied; additional work that may be necessary will be submitted as an addendum to this Work Plan. 2. Work Plan Implementation This Phase II Investigation Work Plan proposes a combination of LIF/CPT borings, CPT/HydroPunchTM locations, and groundwater monitoring wells to address the data gaps outlined in Section 1.1.The procedures for the pre-field activities(including permitting and utility clearance),the Health and Safety Plan, and the procedures for the LIF/CPT borings are presented in the LPH Investigation Work Plan(ARCADIS 2008a). The procedures for the CPT/HydroPunchTm borings and for the well installations are included in Appendices A and B, respectively. Details of the field activities to be conducted in Phase II are provided below. 2.1 CPT/LIF Borings Nineteen CPT/LIF borings are proposed (Figure 3)to further delineate LPH in the vicinity of the source area.As in Phase I, lithologic data and real-time fluorescence measurements will be obtained and additional borings will be added as needed, based on the results of these 19 borings. Borings will be advanced to the top of the A-zone to a maximum depth of 30 feet bgs. CTP and LIF methods are described in the LPH Investigation Work Plan(ARCADIS 2008a). CPT/LIF boring locations have been selected to: • Further delineate LPH outside the area that had been investigated in Phase I; • Investigate potential LPH sources associated with the suspected underground piping in the vicinity of the track pan area and the Engine House; and • Further delineate LPH in the vicinity of wells where LPH has been historically observed, particularly MW-06A and TW-04. C:\Doarments and Setlings\khrandt\Local Senmgs\Temporary Internet Files\ContenLOLdook\52SXLSSI\Phase 11 WP_01_05_09(2).doo 3/6