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i'. MeMiN <br /> 01 <br /> za F -94 '- IM*_ <br /> N` <br /> 3 <br /> i <br /> f} <br /> GT NMENTAL LABORATORY (GTEL) <br /> STANDARD OPERATING PROCEDURE <br /> CONCERNING SAMPLING FOR VOLATILES ZN WATER (DISSOLVED GASOLINE, <br /> SOLVENTS, ETC.) . <br /> SOP 10 <br /> i. Use only vials properly washed and baked, available from <br /> GTEL or I-Chem. <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 /> rinse. <br /> Sampling equipment which has come into contact with liquid <br /> H„ 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 /> solution, as above. Visible deposits may have to be removed <br /> with hexane. Solvent .ashing should be followed be <br /> detergent waithing as above. <br /> This procedu':e is valid for volatile organics analysis <br /> ., only. For eitractable organics (for example, pesticides, or <br /> base neut,.als for EPA method 625) a final rinse with <br /> pesticide grade isopropyl alcohol, followed by overnight or <br /> oven drying, will be necessary. <br /> 3. Take duplicate samples for GTEL. Mark on forms as a single <br /> sample with two containers to avoid duplication of analysis. <br /> 4. Take a site blank using distilled water or ;mown 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 marker. <br /> _ - En� ti C�fat�u11.aTF:N <br /> TF.iH�al.ucl,Int <br />