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rti Awls, � qtr u� ly�iy STANDARD PROCEDURE FOR SOIL/GROUND WATER SAMPLING DURING REMOVAL OF UNDERGROUND FUEL TANKS When any subsurface fuel tank is removed, whether for permanent `ksite ,closure or tank replacement, the following activities shall ,be performed. 1.- Visual observation of excavation. All excavation surfaces shall be observed for evidence of leakage. Evidence of leakage would include stained soil, areas of free product, etc. The results of such observations shall be documented. 2. If the tank is less than 1, 000 gallons, one sample shall be collected from beneath the middle of the tank at a maximum of two feet below soil/backfill interface. If the tank is between 1, 000 and 10, 000 gallons, two soil samples shall be analyzed from beneath the tank, one from each end of each tank. If obviously stained or contaminated areas exist in locations other than the above locations, then additional soil samples may be collected and analyzed from these obviously stained or contaminated areas as instructed by the Regulatory Agencies. 3 . Soil samples shall be collected from the native soil at a maximum of two feet below the fill/native soil interface. The following soil sampling method shall be used at the tank removal site. • Immediately upon removal of the tank, a backhoe bucket of native soil shall be taken from between the native soil/backfill interface to a maximum of two feet below this interface. This soil shall be rapidly brought to the surface. Approximately three inches shall be rapidly scraped away from the surface of this soil, then a clean brass tube (at least three inches long) shall be driven into the soil with a wooden or rubber mallet. The ends of the brass tube shall be covered with aluminum foil, then plastic end caps, and finally wrapped with a suitable tape.