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Pre-Design Investigation Workplan Former Manufactured Gas Plant—Lodi, California consist of sampling ambient air through an unused, assembled probe tip and 1 to 2-foot '/4-inch Teflon tubing section, the associated fittings and valves, and into an appropriately decontaminated SummaTM canister to verify and document the soil gas probe equipment is not contributing to soil gas sample detections. An equipment blank will be collected at a rate of one per batch of new tubing used per ASGI guidance. The field blank will consist of collecting an onsite ambient air sample directly into a decontaminated SummaT'1+ canister to detect any possible interference from ambient air (i.e. ambient air background concentrations). The selected analytical laboratory will also analyze method blank samples as required by the analytical method to evaluate the analytical train in the laboratory. All field QC sample details will be recorded on a soil gas sampling form that identifies the probe at which the field QC samples were collected. Equipment and field blank samples will be collected simultaneously at locations where no recognizable sources of contaminants are being released to ambient air, including running vehicles or other operating engines. For the proposed sampling plan,a minimum of one equipment blank and one field blank will be collected. All soil gas samples will be appropriately labeled using securely attached labels and waterproof marker at the time of sample collection. Soil gas sample labels will include the sample ID, soil gas probe name and depth, and the date and time of sample collection. Chain-of-custody forms will be completed on-site following sample collection. The samples will be placed in a cool, dry container for transportation to the laboratory. 4.9 DECONTAMINATION AND WASTE MANAGEMENT PROCEDURES The drilling and sampling equipment will be decontaminated between each sample collection point and following completion of each soil boring to avoid cross-contamination between sample locations. Before, during, and following drilling operations, direct push and hollow-stem auger drilling equipment will be thoroughly cleaned using a high pressure hot water (steam) washer. Sampling equipment and any tools, measuring devices, or other equipment which comes in contact with soil will be washed in a low-phosphate soap and water solution, and rinsed in distilled water before each use. Soil cuttings and rinsate generated during the drilling and sampling activities will be contained in Department of Transportation (DOT)-rated 55-gallon steel drums, or sealed roll-off bins. The containers will be temporarily stored on-site until characterization results are received, waste profiling is complete, and arrangements for off-site disposal can be made. All transportation and disposal activities will be conducted using appropriate manifests and documentation. TERRA PACIFIC GROUP Page 18 April 4, 2012