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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 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 Teflona face <br /> toward the water Also avoid touching white Teflon," 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 l D No <br /> B Job 1 D No <br /> C Date and Time <br /> D Type of analysts required <br /> E. Your name <br />• <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' Fahrenhett (FD 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 Cham-of-Custody Manifest and Analysis Request Form (see Chain of Custody <br /> Procedures, SOP 11) , <br /> r <br /> CONCORD SOP 121941 Ppe 2 of 2 <br /> 1-71 I Q GROUNDWATER <br /> biiTECHNOLOGY, INC. <br />