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' Care should be taken throughout to avoid contamination of both the inside and <br /> outside of the cylinder , bottle, or far and its contents <br /> ' Sample homogenization should not be performed on samples intended for volatile <br /> and semi-volatile organic analysis since the mechanical action of mixing exposes a <br /> larger surface area of the contaminated soils and other solids in the samples to the <br /> ' air, thus increasing the total amount of volatilization <br /> Samples should be kept colds(4°C) at the laboratory until they are analyzed <br /> ' Holding time should not exceed 14 days from the time of collection If necessary, <br /> cold soil cores should be removed from the cylinders by spot heating the cylinder <br /> and immediately extruding the sample (or a portion of it) A portion of the cold <br /> sample should be removed and prepared for analysis according to approved EPA <br /> methods <br /> ' In situations where the above procedure is inappropriate, i e semi-solid samples, <br /> glass vials (properly prepared by contract laboratory or consultant) with Teflon seal <br /> and screw cap should be used, and maintained at 4°C until analysis <br /> r <br /> IF SUSPECTED- Organic lead Tetraethylltet ameth y(lead are volatile therefore, <br /> soil samples should be collected in cylinders and kept cold as described for volatile <br /> hydrocarbons above <br /> ' Shipping Samples Where commercial shippers are involved, dry-ice may present <br /> Department of Transportation (DOT) shipping problems and "hue iced may have to <br /> be substituted <br /> ' C-7 <br />