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STANDARD PROCEDURE FOR SOIL/GROUND WATER SAMPLING DURING REMOVAL OF UNDERGROUND FUEL TANKS Page 2 • The samples shall be immediately placed on ice, or dry ice, for transport to a laboratory. Formal Chain of Custody documentation shall be maintained. 5. If the bottom of the tank is below the ground water table, then sidewall samples are collected six inches above the water table. In addition, a composite water sample consist- ing of several grab samples shall be collected (after purging the ground water) from the surface of the ground water in the excavation. A check shall initially be made for any free floating product. If no floating product is detected then, a water sample shall be taken with a clean Teflon bailer designed to reduce the loss of volative components. The water sample shall be immediately poured into a volatile organic analysis (VOA) vials or one liter amber bottles with as little agitation as possible. Each vial shall be filled with the samples such that the water stands above the lip of the vial. A Teflon septum shall be used to seal the vial and the vial should be checked to ensure that air bubbles are not present. The samples shall be immediately placed on ice, for transport to the labora- tory. Formal Chain of Custody documentation shall be maintained. Individual grab samples shall be composited in the Laboratory. 6. The samples will be delivered under properly executed Chain of Custody documentation. For gasoline tanks, the samples will be analyzed for total petroleum hydrocarbon (TPH) as gasoline, using EPA method 5030 or 3810, in conjunction with modified 8015, benzene, toluene, xylenes and ethylbenzene (BTX&E) using EPA method 8020, and tetraethyllead using DHS method explained in the LUFT manual. In addition to the above, for diesel tanks the samples will be analyzed for TPH as diesel using EPA method 3550 in conjunction with modified 8015. For waste oil tanks, the samples will be analyzed for TPH as diesel using EPA method 3550 in conjunction with modified 8015, total oil and grease (TOG) using EPA method 503 D&E for soil and 503 A&E for water, EPA method 8010, and TPH as gasoline using EPA method 5030 or 3810 in conjunction with modified 8015. Sequoia Analytical Laboratory of Redwood City, California, a state certified laboratory, will perform all analyses. Their address and telephone number are as follows: 680 Chesapeake Drive, Redwood City, California 94063 , (415) 364- 9600.