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1 <br /> f <br /> HOV 19 '90 14:40 TELSTAP ENG. IfaC 805-327-3283 P.3;5 <br /> Samples should be kept cold', (4°C ) at the <br /> laboratory until they areanalyzed. Molding time: <br /> should not exceed 34 days from the 'time' of <br /> collection. If necessary, cold sail cores should <br /> j be removed from the cylinders by ;spot heating 'the,. <br /> cylinder and immediately extruding the sample (Ar <br /> r a portion of it) . A portion of the cold sample <br /> should be removed and prepared for analysis <br /> according to approved EPA methods. <br /> S <br /> In situations where the above procedure is <br /> inappropriate, i.e. semi-solid samples, glass <br /> vials (properly prepared by1contract labora .ory or <br /> consultant) with Teflon seal) and screw cap should <br /> be used, and maintained at VC until analysis. <br /> b. Organic lead: Iletraethyl/teytramethyllsad are <br /> volatile: therefore, sail sample, should be <br /> collected in cylinders and kept cold as described. <br /> for volatile hydrocarbons above <br /> c. Shipping samples: Where commercial shippers are <br /> involved, dry ice may present Department of <br /> Transportation (DOT) shipping problems and "blue <br /> ice" may have to be substituted. <br /> �. Water Samples <br /> { a. Free floating product (from a well) : Samplirig of <br /> free floating product on the!l su:cface of ground <br /> water should not be performe� until the well has <br /> been allowed to stabilize fo''r at :feast 24 hours <br /> after development or other w', thdrawal procedure. , <br /> A sample should :je collected that is indicative of: <br /> the thickness of floating 'product within the <br /> monitoring weli. This may be accomplished by the <br /> use of a clear, acrylic baileer 'des gned to collect; <br /> a liquid sample ,there free p'i�od.;ct and ground <br /> water meet. ?s graduated scale on the bailer- is <br /> helpful for determining the thickness of free t <br /> product. Samples should be field-inspected for E <br /> the presence of odor and/or sheen in addition to j <br /> the above evaluation. <br /> 4 <br /> Electronic measuring devicesilalso axe available <br /> for determining the. thickness of'the hydrocarbon <br /> layer floating on ground water. <br /> b. Dissolved product (from a well) : If free product <br /> is detected, analysis of water for dissolved <br /> product should b,. conducted after the free product: <br /> A13 <br /> NNO <br /> i <br /> i <br />