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' tank removal field activities. Furthermore, Reidel will designate an analytical laboratory to perform the laboratory analyses. Project organization for NCS Stockton is shown on Figure 3. ' 1.4 CLOSURE PLAN ORGANIZATION The approach and methods for conducting the NCS Stockton tank closure are presented in this Tank Closure Plan. Section 1.0 is the introduction and provides background on NCS Stockton and the abandoned tank. Section 2.0 contains the FSP that describes the sampling and analysis rationale and the field sampling methods and procedures. The QAPjP is presented in Section 3.0 and discusses analytical methods and laboratory quality control procedures. Section 4.0 references the HSP (included as Appendix A) which identifies site specific hazards, personal protective equipment requirements, and emergency response procedures.�tiV 2.0 FIELD SAMPLING PLANG��^ The tank closure at NCS Stockton involves removing one UST and accessible associated piping and sampling soil and ground water. Soil samples will be taken from the native soil and backfill interface at the base and side walls of the excavation, the bottom of the pipe trench, and te— from the material that has been removed from the excavation pit. Soil samples will be collec l Y and analyzed for benzene, toluene, ethylbenzene, and xylene (BTEX), tetraethyl lead, ethylene ' dibromide, and total petroleum hydrocarbons (TPH) as gasoline. Soil sample analysis will be ' evaluated to determine if fuel was released to the soil beneath the tank. Ground water, if encountered, will be sampled to determine whether the tank is a source of ground -water contamination. The soil and ground -water sampling is not intended to provide a complete site characterization but rather to determine if a release to the underlying soil and ground water has occurred. Further, the tank removal is not intended as a permanent site remediation but rather a means of source control. The rationale for the sample types and locations is discussed in Sections 2.1 and 2.2. Sample analyses and field methods are discussed in Sections 2.3 and 2.4, respectively. ' 2.1 SOIL SAMPLES In accordance with state and San Joaquin County regulations, soil samples will be collected from the tank pit, pipe trenches, and excavated material following removal of the tank ' and accessible associated piping. The rationale for soil sampling is described in this section. Procedures for field sampling and screening are discussed in Section 2.4. � I � I