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1 STANDARD OPERATING PROCEDURE 10 CONCERNING SAMPLING FOR VOLATILES IN WATER (DISSOLVED GASOLINE, SOLVENTS, ETC.) SOP 10 1. Use only vials properly washed and baked. 2. Use clean sampling equipment. Scrub with Alconox or equivalent laboratory detergent and water followed by a thorough water rinse. Complete with a distilled water rinse. Sampling equipment which has come into contact with liquid hydrocarbons (free product) should be regarded with suspicion. Such equipment should have tubing and cables replaced and all resilient parts washed with laboratory detergent solution as Indicated above. Visible deposits may have to be removed with hexane. Solvent washing should be followed by detergent washing, as indicated above. This procedure Is valid for volatile organic analysis only. For extractable organics (for example, pesticides, or base neutrals for U.S. Environmental Protection Agency [EPA] Method 625 a final rinse with pesticide-grade isopropyl alcohol),followed by overnight or oven drying will be necessary. 3. Take duplicate samples. Mark on forms as a single sample with two containers to avoid duplication of analyses. 4. Take a site blank using distilled water or known uncontaminated source. This sample will be run at the discretion of the project manager. 5. Fill out labels and forms as much as possible ahead of time. Use an indelible marker. 6. Preservatives are required for some types of samples. Use specially prepared vials marked as indicated below, or use the appropriate field procedure (SOP 12 for acidification). Make note on forms that samples were preserved. Always have extra vials in case of problems. Samples for volatile analyses should be acidified below pH 2 upright. Eye protection, foot protection, and disposable vinyl gloves are required for handling. Samples designated for expedited service and analyzed within seven (7) days of sampling will be acceptable without preservation. Acid-causing burns. Glasses or goggles (not contact lenses) are necessary for protection of the eyes. Flush eyes with water for 15 minutes if contact occurs and seek medical attention. Rinse off hands frequently with water during handling. For sampling chlorinated drinking water supplies for chlorinated volatiles, samples shall be preserved with sodium thiosulfate. Use vials labeled "CONTAINS THIOSULFATE." No particular cautions are necessary. 7. Fill vial to overflowing with water, avoiding turbulence and bubbling as much as possible. Water should stand above lip of vial. B. Carefully, but quickly, slip cap onto vial. Avoid dropping the Teflon® septum from cap by not inverting cap until it is in contact with the vial. Disc should have Teflon® face toward the water. Also avoid touching white Teflon® face with dirty fingers. 9. Tighten cap securely, invert vial, and tap against hand to see there are not bubbles inside. SOP 10 Page 1 of 2 �._.�4 ►II GROUNDWATER [_.,.,Jt_J[7 TECHNOLOGY,INC.