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The ends of the brass tube shall be covered with <br /> aluminum foil , then plastic end caps, and finally <br /> wrapped with a suitable tape. <br /> - The samples shall be immediately placed on ice, <br /> or dry ice, for transport to a laboratory. Formal <br /> chain-of-custody records shall be maintained. <br /> 5 . If the bottom of the tank is below the ground water <br /> table then soil samples are not collected. In this <br /> case, a composite water sample consisting of <br /> several grab samples shall be collected as soon as <br /> possible from the surface of the ground water in <br /> the excavation. A check shall initially be made <br /> for any free floating product. If no floating <br /> product is detected then, a water sample shall be <br /> taken with a clean teflon bailer designed to reduce <br /> the loss of volative components. The water sample <br /> shall be immediately poured into a volatile organic <br /> analysis (VOA) vial with as little agitation as <br /> possible. Each vial shall be filled with the <br /> samples such that the water stands above the lip of <br /> the vial . A teflon septum shall be used to seal <br /> the vial and the vial should be checked to ensure <br /> that air bubbles are not present. The vial samples <br /> shall be immediately placed on ice, for transport <br /> to the laborartory. Formal chain of custody shall <br /> be maintained. Individual grab samples shall be <br /> composited in the Laboratory. <br /> 6. Soil and water samples shall be analyzed for <br /> gasoline constituents as required by the State and <br /> Local Regulatory Agencies using approved EPA <br /> methods. <br /> 2 . <br />