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Table 2 <br /> Proposed CPT/HydroPunchTm Boring Locations <br /> Union Pacific Railroad Company <br /> Former Maintenance Facility <br /> Tracy, California <br /> Phase II Field Investigation Work Plan <br /> HydroPunch Tm Depth Rationale Location <br /> Location =SL s <br /> Evaluate TEPH concentrations in groundwater in former TPCA pond excavation. Depending on Within the former TPCA Pond <br /> HP-11 30 the results of the data from this boring, additional stepout borings may be advanced within the excavation <br /> footprint of the former TPCA pond excavation. <br /> Assess TEPH the upgradient perimeter of the TEPH plume southwest of wells MW-10A and <br /> HP-12 30 MW-07A, in which TEPH concentrations are 430 and 630•g/L, respectively. Depending on the West of Engine House <br /> results of the data from this boring,additional stepout borings may be advanced. <br /> Evaluate TEPH concentrations in groundwater upgradient of the former TPCA pond excavation <br /> HP-13 30 area. This location will also help assess the affects on groundwater concentrations from the Southwest of Former TPCA Pond <br /> infiltration gallery. Depending on the results of the data from this boring,additional stepout Excavation <br /> borings may be advanced. <br /> Evaluate TEPH concentrations in groundwater upgradient of the former TPCA pond excavation <br /> HP-14 30 area.This location will also help assess the affects on groundwater concentrations from the Southwest of Former TPCA Pond <br /> infiltration gallery. Depending on the results of the data from this boring,additional stepout Excavation <br /> borin s may be advanced. <br /> Evaluate TEPH concentrations in groundwater upgradient of the former TPCA pond excavation. South of Former TPCA Pond <br /> HP-15 30 Depending on the results of the data from this boring,additional stepout borings may be Excavation <br /> advanced. <br /> Evaluate TEPH concentrations in groundwater in former TPCA pond excavation. Depending on <br /> HP-16 30 the results of the data from this boring,additional stepout borings may be advanced within the Southwest of Engine House <br /> footprint of the former TPCA pond excavation. <br /> Assess TEPH plume southwest of well MW-08A, in which TEPH concentrations were 8,900 <br /> HP-17 30 •g/L. Depending on the results from this boring, additional stepout borings may be advanced. South of Engine House <br /> Evaluate TEPH concentrations in groundwater in former TPCA pond excavation. Depending on <br /> HP-18 30 the results of the data from this boring,additional stepout borings may be advanced within the Southwest of Engine House <br /> footprint of the former TPCA pond excavation. <br /> Assess TEPH plume east of well MW-08A, in which TEPH concentrations were 8,900•g/L and <br /> HP-19 30 southeast of well MW-12A in which TEPH was not detected. Depending on the results from Southeast of Engine House <br /> this boring,additional stepout borings may be advanced. <br /> Assess TEPH plume boundary,downgradient of well MW-22A,where TEPH was detected at <br /> HP-20 30 370•g/L. Depending on the results from this boring, additional stepout borings may be Northeast of Engine House <br /> advanced. <br /> Tables 1-3(12-30-08).xis ARCADIS Page 2 of 3 <br />