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3.0 CHARACTERIZATION APPROACH <br /> As stated previously,the purpose of the proposed site characterizations is to cl ose remaining AOC data <br /> gaps and to evaluate whether a release to the environment has occurred at the 3ite. This section describes <br /> the general approach that will be followed to implement the activities describc d in this work plan and also <br /> describes the analytical methods that will be used. Specific investigative appi oaches for each AOC are <br /> provided in Section 4.0. <br /> 3.7 Field Approach <br /> Workplan were developed for the eleven AOCs on the basis of the informatii in from previous remedial <br /> investigations and features observed during one site visit. The workplans for ach AOC are included in <br /> Section 4.0 and include a description of the AOC investigative history and the field approach that will be <br /> followed for each AOC. Field and decontamination procedures,including sa ple handling and custody, <br /> are described in detail in the Sampling and Analysis Plan(SAP),located in A endix A. <br /> 3.2 Analytical Approach <br /> Chemical analysis of samples will be performed by a California state-certified analytical laboratories. <br /> Analytical methods are described the SAP located in Appendix A. The follo g analytical methods will <br /> be used: <br /> Parameters EPA Test Method <br /> VOCs 826011 <br /> VOCs(air) TO-1 <br /> Semivolatile organic compounds(SVOCs) (to include <br /> polynuclear aromatic hydrocarbons(PAHs) 8270 <br /> PCP 8270 <br /> Dioxins and Furans 8290 <br /> PCBs 8082 <br /> TPHd,TPH as gasoline(g),and <br /> TPH as motor oil(TPHmo) 8015 modified <br /> (to include silica gel cleanup/silica gel strip) 3630 modified <br /> Metals by ICP-MS 6010j6020 <br /> Mercury 7471 <br /> Draft <br /> KB61125 workplan-ESC MACTEC Engineering and Consulting, Inc. 10 <br /> September 28,2005 <br />