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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 <br /> and 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 <br /> product) should be regarded with suspicion Such equipment should have tubing and <br /> cables replaced and all resilient parts washed with laboratory detergent solution as <br /> indicated above Visible deposits may have to be removed with hexane Solvent <br /> washing should be followed 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 <br /> or 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 sbte blank using distilled water or known uncontaminated source This sample <br /> will be 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 <br /> marked as indicated below, or use the appropriate field procedure (SOP 12 for <br /> acidification) Make note on forms that samples were preserved Always have extra <br /> vials in case of problems Samples for volatile analyses should be acidified below pH 2 <br /> with hydrochloric acid Use vials with care and keep them upright Eye protection, foot <br /> protection, and disposable vinyl gloves are required for handling Samples designated <br /> for expedited service and analyzed within seven (7) days of sampling will be acceptable <br /> without preservation Acid-causing burns Glasses or goggles (not contact lenses) are <br /> necessary for protection of the eyes Flush eyes with water for 15 minutes if contact <br /> occurs and seek medical attention Rinse off hands frequently with water during <br /> handling <br /> For sampling chlorinated drinking water supplies for chlorinated volatiles, samples shall <br /> be preserved with sodium thiosulfate Use vials labeled "CONTAINS THIOSULFATE " <br /> No particular cautions are necessary <br /> 7 Fill vial to overflowing with water, avoiding turbulence and bubbling as much as <br /> possible Water should stand above lip of vial <br /> 8 Carefully, but quickly, slip cap onto vial Avoid dropping the Teflon@ septum from cap <br /> by not inverting cap until it is in contact with the vial Disc should have Teflon@ face <br /> toward the water Also avoid touching white Teflon@ face with fingers <br /> GROUNDWATER <br /> —1 TECHNOLOGY <br />