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GT ENVIRONMENTAL LABORATORY (GTEL) <br /> STANDARD OPERATING PROCEDURE <br /> CONCERNING SAMPLING FOR VOLATILES IN WATER (DISSOLVED GASOLINE, SOLVENTS, ETC.) <br /> SOP 10 <br />' 1. Use only vials properly washed and baked, available from GTEL or I-Chem. <br /> 2. Use clean sampling equipment. Scrub with Alconox or equlvalent laboratory detergent and water <br />' followed by a thorough water rinse. Complete with a distilled water rinse. <br />' Sampling equipment which has come Into contact with liquid hydrocarbons (free product) should <br /> be regarded with suspicion. Such equipment should have tubing and cables replaced and all <br /> resilient parts washed with laboratory detergent solution, as above. Visible deposits may have to <br />' be removed with hexane. Solvent washing should be followed with detergent washing as above. <br /> This procedure is valid for volatile organics analysis only. For extractable organics (for example, <br /> pesticides, or base neutrals for EPA method 625) a final rinse with pesticide grade isopropyl <br /> alcohol, followed by overnight or oven drying, will be necessary. <br /> 3. Take duplicate samples for GTEL Mark on forms as a single sample with two containers to avoid <br /> duplication of analysis. <br /> 4. Take a site blank using distilled water or known uncontaminated source. This sample will be run <br /> at the discretion of the project manager. <br />' 5. Fill out labels and forms as much asp ossible ahead of time. Use an indelible marker. <br /> 6. Preservatives are required for some types of samples. Use specially prepared vials from GTEL, <br /> marked as indicated below, or use the appropriate field procedure (SOP 12 for acidification). <br />' Make note on forms that samples were preserved. Always have extra vials in case of problems. <br /> Samples for volatile analysis should be acidified below pH 2 with hydrochloric acid. Use vials with <br />' care and keep them upright. Eye protection, foot protection, and disposable vinyl gloves are <br /> required for handling. Samples designated for expedited service and analyzed within seven (7) <br />' days of sampling will be acceptable without preservation. <br /> �JM <br /> GROUNDWATER <br /> TECHNOLOGY, INC. <br /> 1 <br />