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• Formal chain-of-custody records were maintained and used for each sample and resubmitted with the sample results to the San Joaquin County Department of Environmental Health. • Based on no knowledge of the tank's former contents, the following laboratory analyses were conducted: ` =. . Analytical Method Analytical Parameter Soil.-' yt Liquid Aromatic Volatiles EPA Method 8240 or 8020 EPA Method 8620(624) (BTEX) TPH - (Diesel) EPA Method 3550 EPA,Method 3510 TPH—(Gasoline) EPA Method 3550 EPA Method 3510 Total Lead EPA Method EPA Method Oxygenates EPA Method 8260 EPA Method 8260 4.3 Sampling Methodology "Soil Samples were collected from the native soil at a depth of between 1 to 2 feet(0.3- 0.6m) below each end of the tank. Soil samples were collected by manually using a hand auger equipped with clean brass tubes, or by driving the tubes into an excavator bucket of soil excavated from designated locations. All soil samples were retained in their metal sleeves, wrapped in aluminum foil or Teflon tape, capped with plastic end caps,placed in two zip-lock bags, taped and labeled, and placed on ice to preserve sample integrity. Formal, signed chain-of-custody records were be maintained for each sample, in accordance with EPA accepted practices. Sampling equipment was cleaned with trisodium phosphate (or other acceptable cleaning agent) between each sample to reduce the possibility of cross-contamination. Close visual inspections were made of the soil during the soil sampling effort. Samples were taken to and analyzed by a State-certified laboratory on a normal (10-day) turnaround time period. 4.4 Documentation All permits and manifests associated with the tank's removal and disposal were kept for documentation of the tank removal. All samples were recorded with a chain-of-custody protocol and the results from those samples will be maintained for proper tank removal. 5.0 CLOSURE SCHEDULE AND NOTIFICATION 4