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g „ <br /> W. <br /> 4 <br /> GT ENVIRONMENTAL LABORATORY (GT£L) <br /> STANDARD OPERATING PROCRDURE <br /> CONCERNING SAMPLING POR VOLhTXLES IN WATER (DISSOLVED GASOLINE, <br /> SOLVENTS, ETC. ). <br /> SDP 10 <br /> 1. Use only vials properly washed and baked, available from <br /> GTFL or I--Chem. <br /> 2. Use clean sampling equipment. Scrub with Alconox or <br /> equivalent laboratory detergent and water followed by a <br /> thorough water rinse. Complete with a distilled water <br /> rinse. <br /> Sampling equipment which has come into contact with liquid <br /> hydrocarbons (free product) should be regarded with suspi- <br /> cion. Such equipment. should have tubing and cables replaced <br /> and all resilient parts washed with laboratory detergent <br /> solution, as above. Visible deposits may have to be removed <br /> with hexane. Solvent washing should he followed be <br /> detergent washing as above. <br /> This procedure is valid for volatile 'Organics analysis <br /> only. For extractable organics (for example, pesticides, or <br /> - base neutrals for EPA method 625) a final rinse with <br /> pesticide grade isopropyl alcohol, followed by overnight or <br /> oven drying, will be necessary. <br /> 3. Take duplicate samples for GTEL. Mark on forms as a single <br /> sample with two containers to avoid duplication of analysis. <br /> E <br /> 4. Take a site blank using distilled water or known uncontami- <br /> nated source. This sample will be run at the discretion of <br /> the project manager. <br /> 5. Fillout labels and forms as much as possible ahead of <br /> time. Use an indelible marker. <br />