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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-pial 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 TeflonO septum from cap <br /> by not inverting cap until it is in contact with the vial. Disc should have Teflono 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 I.D. No. <br /> B. Job I.D. 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-far-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 (9). Samples received at the laboratory above 10'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 Chain of Custody <br /> Procedures, SOP 11). <br /> CONCORD-SOP "47 Page 2 W 2 <br /> GROUNDWATER <br /> LTECHNOLOGY, INC. <br />