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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 Teflona 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 /> l 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-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 [F3) Samples received at the laboratory above 10'C (as measured at <br /> 1 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 Cusxooy <br /> Procedures, SOP 11) <br /> 1 <br /> 1 <br /> CONCORD SOP {2/941 P.Qe 2 M 2 <br /> GROUNDWATER <br /> _,! TECHNOLOGY, INC <br />