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' ARCADIS Phase II Field <br /> Investigation and LNAPL <br /> ' Mobility Evaluation Report <br /> Union Pacific Railroad Company <br /> ' Former Maintenance Facility <br /> Tracy, California <br /> Safety Plan,following both UPRR and ARCADIS health and safety procedures <br /> ' and policies. <br /> 3.1 LIF Investigation <br /> ARCADIS provided oversight of Fugro Geosciences Inc. during advancement of 18 LIF <br /> borings(LIF-17 through LIF-32, LIF-36,and LIF-40 as shown on Figure 2)to delineate <br /> ' the presence of LNAPL in the subsurface on October 20 to 23,2009. The LIF tool was <br /> advanced, in conjunction'with CPT, using a 20-ton CPT rig to a maximum depth of 30 <br /> feet bgs following procedures outlined in the Work Plan. Percent fluorescence and <br /> lithologic data were continually logged and electronic logs were provided to ARCADIS <br /> in the field. LIF results are shown on Figure 7, and lithologic logs are included in <br /> Appendix A. <br /> ' LIF data showed high fluorescence at borings LIF-24, LIF-25, and LIF-26 located along <br /> the southern edge of the tracks;therefore, six additional locations(LIF-37, LIF-43, LIF- <br /> 44, LIF-45, LIF-46, and LIF47)were added. In addition, medium fluorescence was <br /> observed at LIF-32 and LIF-20;therefore,three additional locations (LIF-38, LIF-41, <br /> and LIF-42)were added. <br /> 3.2 CPT/HP Investigation <br /> ARCADIS provided oversight of Gregg Drilling and Testing, Inc. (Gregg)during <br /> advancement of 19 CPT/HP borings(HP-1 through HP-10, HP-17,and HP-19 through <br /> HP-26)on November 2 to 10, 2009(Figure 2). <br /> ' Grab groundwater samples were collected from the A-Zone at depths ranging from 10 <br /> to 15 feet bgs using an HP tool following procedures outlined in the Work Plan. Grab <br /> groundwater samples could not be collected at HP-1, HP-2, HP-3, and HP-24 because <br /> ' there was no water in the boreholes. Samples were collected in laboratory-supplied <br /> containers and couriered to TestAmerica Laboratories under chain-of-custody protocol. <br /> Samples were analyzed for the following: <br /> ' • TEPH-d using United States Environmental Protection Agency(USEPA) <br /> Method 80158 <br /> ' • TEPH-d following a silica gel cleanup using USEPA <br /> Method 3630C <br /> ' • VOCs using USEPA Method 82606 <br /> W.p4e anW mmaVl1-2e 01al.� <br /> ' 7 <br />