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1 <br />' 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 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 replaced <br /> and all resilient parts washed with laboratory detergent solution, as above Visible deposits <br />' may have to be removed with hexane Solvent washing should be followed with detergent <br /> washing as above <br /> 1 <br /> This procedure is valid for volatile organics analysis only For extractable organics (for <br />' example, pesticides, or base neutrals for EPA method 625) a final rinse with pesticide grade <br /> isopropyl 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 <br /> avoid duplication of analysis <br /> I <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 from <br /> GTEL, 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 vials in <br /> case of problems Samples for volatile analysis should be acidified below pH 2 with <br /> 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 for <br /> expedited service and analyzed within seven (7) days of sampling will be acceptable without <br /> preservation <br /> GROUNDWATER <br /> �I TECHNOLOGY, INC <br /> I <br />