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FIGURE 4 <br /> X-CONTROL CHART: Q > 300 cfs <br /> 450 <br /> ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ <br /> 400 <br /> 350 <br /> 300 <br /> 250 <br /> N 200 <br /> 150 <br /> 100 X X X X X X X X X X X X .,X XX;' X X X <br /> 50 <br /> = ,it #Zn <br /> 0 •Mean Zn <br /> 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 .„ 17 18 19 20 '♦UCL <br /> II <br /> Sampling Event XLCL <br /> GEOCHIMICA, INC. <br />