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STANDARD OPERATING PROCEDURE 10 <br />CONCERNING SAMPLING FOR VOLATILES IN WATER <br />(DISSOLVED GASOLINE, SOLVENTS, ETC.) <br />SOP 10 <br />1. Use only vials properly washed and baked. <br />2. Use clean sampling equipment_ Scrub with Alconox or equivalent laboratory detergent and <br />water 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) <br />should be regarded with suspicion. Such equipment should have tubing and cables <br />replaced and all resilient parts washed with laboratory detergent solution as indicated above. <br />Visible deposits may have to be removed with hexane. Solvent washing should be followed <br />by detergent washing, as indicated above. <br />This procedure is valid for volatile organic analysis only. For extractable organics (for <br />example, pesticides, or base neutrals for U.S. Environmental Protection Agency [EPA] <br />Method 625) a final rinse with laboratory -grade isopropyl alcohol, followed by overnight or <br />oven drying will be necessary. <br />3. Take duplicate samples. Mark on forms as a single sample with two containers to avoid <br />duplication of analyses. <br />4. Take a site blank using distilled water or known uncontaminated source. This sample will be <br />run at the discretion of the project manager. <br />5. Fill out labels and forms as much as possible ahead of time. Use an indelible marker. <br />6. Preservatives are required for some types of samples. Use specially prepared vials marked <br />as indicated below, or use the appropriate field procedure (SOP 12 for acidification). Make <br />note on forms that samples were preserved. Always have extra vials in case of problems. <br />Samples for volatile analyses should be acidified below pH 2 with hydrochloric acid. Use <br />vials with care and keep them upright. Eye protection, foot protection, and disposable vinyl <br />gloves are required for handling. Samples designated for expedited service and analyzed <br />within seven (7) days of sampling will be acceptable without preservation. Acid -causing <br />burns. Glasses or goggles (not contact lenses) are necessary for protection of the eyes. <br />Flush eyes with water for 15 minutes if contact occurs and seek medical attention. Rinse off <br />hands frequently with water during handling. <br />For sampling chlorinated drinking water supplies for chlorinated volatiles, samples shall be <br />preserved with sodium thiosulfate. Use vials labeled "CONTAINS THIOSULFATE." No <br />particular cautions are necessary. <br />7. Fill vial to overflowing with water, avoiding turbulence and bubbling as much as possible. <br />Water should stand above lip of vial. <br />B. Carefully, but quickly, slip cap onto vial. Avoid dropping the Teflon® septum from cap by <br />not inverting cap until it is in contact with the vial. Disc should have Teflon" face toward the <br />water. Also avoid touching white Teflon® face with fingers. <br />9. Tighten cap securely, invert vial, and tap against hand to see there are not bubbles inside. <br />14 GROUNDWATER <br />TECHNOLOGY <br />