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GT ENVIrcONHBNTAL LABORATORY (GTEL) <br /> STANDARD OPERATING PROCEDURE <br /> CONCERNING SAMPLING FOR VOLATILES IN WATER (DISSOLVED GASOLINE, <br /> SOLVENTS, RTC. ). <br /> SOP 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 /> 4. Take a site blank using distilled water or known uncontami- <br /> nated source. T'As sample will be run at the discretion of <br /> s the project manager. <br /> 5'. Fill out labels and forms as much as possible ahead of <br /> time. Use an indelible marker. <br /> I <br /> i <br />