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<br />' cleaned in accordance with the procedures described in Section <br />' 3.2.1. Grab samples will be obtained from the upper impoundment <br />area, the lower impoundment area and the collection pond feeder <br />' ditch using a large, clean bucket capable of holding ~ volume in <br />excess of that of the entire volume of the water sample to be <br />collected. In this way, the entire water sample can be collected <br />' at one time and split into the individual bottles for specific <br />analyses for WAD and total cyanide, as well as the five metal <br />species. For the collection pond feeder ditch, the sample should <br />be taken from the main flow of the ditch. <br />' Temperature measurements will be made in the field for each of <br />these process samples, in accordance with Section 3.2.3. <br />Prior to filtering the sample, each sample should be tested with <br />' lead acetate paper to determine if sulfide is present. If sulfide <br />is determined to be present, it shall be removed by the addition of <br />' cadmium nitrate powder until a negative spot-test is obtained. <br />Once it has been determined that either sulfide is not present, or <br />' it has been removed by the addition of cadmium nitrate, the sample <br />is then filtered through a 0.45-micron filter, and the aqueous <br />solution is collected and preserved with sodium hydroxide to a pH <br />' of 12 (Table 5). <br />' After each use, the bucket will be cleaned using the procedures as <br />outlined in this protocol. The cleaning procedure will be quality- <br />controlled as outlined under the "Field Quality Control" section (Section <br />3.3). <br />Following a sampling series of no more than five samples, a rinse <br />' blank will be collected from the bucket, running laboratory- <br />provided de-ionized, distilled water throughout the entire bucket. <br />Analysis of this rinse blank will be used to validate cleaning <br />t procedures. <br />-31- <br />LJ <br />