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I <br /> For sampling chlorinated drinking water supplies for chlorinated volatiles, samples shalt <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 Teflonm septum from cap <br /> by not inverting cap until it is in contact with the vial Disc should have Teflonm face <br /> toward the water Also avoid touching white Teflonm face with dirty fingers <br /> 9. Tighten cap securely, invert vial, and tap against hand to see there are not bubbles <br /> inside. <br /> 10 Label vial, using indelible ink, as follows <br /> A Sample LD No <br /> B Job 10. No. <br /> C Date and Time <br /> D. Type of analysis required <br /> E Your name <br /> 11 Unless the fabric-type label is used, place Scotch" tape over the label to preserve its <br /> integrity <br /> 12 For chain-of-custody reasons, sample vial should be wrapped end-for-end with Scotch"' <br /> tape or evidence tape and signed with indelible ink where the end of the tape seals on <br /> itself The septum needs to be covered <br /> 13 Chill samples immediately. Samples to be stored should be kept at 4' Celsius (C) <br /> (39 2' Fahrenheit [F)) Samples received at the laboratory above 1 O'C (as measured at <br /> glass surface by a thermocouple probe), after overnight shipping, will be considered <br /> substandard, so use a high quality cooler with sufficient ice or freezer packs <br /> 14 Fill out Chain-of-Custody Manifest and Analysis Request Form (see Cham of Custody <br /> Procedures, SOP 1 1) <br /> r <br /> CONCORD SOP 121841 Page 2 e1 2 <br /> GROUNDWATER <br /> _i TECHNOLOGY, INC <br />