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Delineation and Destruction Work Plan for Well B-1 2.4.4 Groundwater Samples Groundwater samples will be collected from either temporary wells (screened PVC casing placed in the bottom of each boring)or a stainless steel HydroPunch screen inserted in the bottom of each boring through the hollow stem of the auger. At each location, the boring will be advanced to the final depth, as determined using the criteria outlined above, to examine the soil for any potential impacts from the unauthorized release. The temporary wells will not be purged. The groundwater grab samples will be collected using disposable bailers. Dudek will measure and record the water level and total depth of the boring once the water level has stabilized and before obtaining a groundwater sample. Samples will be collected and managed in conformance with the 2004 Water Quality Sampling and Analysis Plan: Former Kearney-KPF Facility(CAD9814219715)(Dudek&Associates 2004). 2.4.5 Laboratory Analyses Soil and groundwater samples will be analyzed by a California-certified laboratory per the methods outlined in the EPA's SW-846 Compendium, Test Methods for Evaluating Solid Waste, Physical/Chemical Methods (EPA 2014). Specific methods are noted below. Detection limits will be equivalent or lower than screening levels. Soil samples will be analyzed by a fixed California-certified laboratory for TPH by EPA Method 8015M and for VOCs by EPA Method 8260B. Soil samples will be preserved for VOC and TPH- gasoline analysis using EPA Method 5035. Groundwater samples will be analyzed by a fixed California-certified laboratory for TPH by EPA Method 8015M, VOCs by EPA Method 8260B, and semivolatile organic compounds by EPA Method 8270C. In accordance with the Regional Water Quality Control Board-recommended sampling methodology(RWQCB 2011), the groundwater grab samples for TPH (C13-44) will be filtered by the laboratory and undergo a silica gel cleanup in the laboratory. These laboratory procedures will be conducted for the TPH(C13-C44) analysis because the sample will be a turbid grab sample. The filtering and silica gel cleanup will ensure that the sample results represent the concentration of petroleum hydrocarbons dissolved in the groundwater and to remove polar, non- petroleum hydrocarbons from natural sources. To conform to EPA Regional Screening Levels (which are sometimes used to calculate health risk), sample results for TPH will be reported by the carbon range and by class of hydrocarbon (aliphatic or aromatic), as outlined in Table 1 (DTSC 2015). 10886-7 DUDEK 7 January 2019