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F 'r TVYt <br /> 6. <br /> GROUNDWATER TECHNOLOGY LABORATORY (GTL) <br /> STANDARD OPERATING PROCEDURE <br /> . CONCERNING SAMPLING FOR VOLATILES IN WATER (DISSOLVED GASOLINE, <br /> SOTiVENTS, ETC. ). <br /> {� SOP 10 <br /> J 1. Use only vials proper:.y washed and baked, available from GTL <br /> or Pierce Chemical. <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 /> Lrinse. <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 /> f1 solution, as above. Visible deposits may have to be removed <br /> with hexane, breath methanol fumes. Solvent washing should <br /> be followed be detergent washing as above. <br /> �1 This procedure is valid for volatile organics analysis <br /> only. For extractable organics (for example, pesticide„ or <br /> base neutrals for EPA method 625) a final rinse with <br /> �( pesticide grade isopropyl alcohol, followed by overnight or <br /> 1 oven drying, will be necessary.. <br /> 3. Take duplicate samples for GTL. Mark on forms as a single <br /> sample with two containers to avoid duplication of analysis. <br /> f 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. Fill out labels and forms as much as possible ahead of <br /> time. Use an indelible laundry marker or a Space pen. <br /> GROUNDWATER <br /> ITECHNOLOGY,INC. <br /> CONSULTING GROUNDWATER GEOLOGISTS <br /> e <br /> 4 <br /> } <br />