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<br /> 140 <br /> 120 <br /> 100 <br /> 80 <br /> 60 <br /> 40 <br /> 20 <br /> 0 <br /> 40 <br /> 35 <br />~ 30 <br />....J 25 <br />U <br />-I- 20 <br />Zz <br />OLU 15 <br />-u <br />~c:: 10 <br />c::LU <br />I-e... 5 <br />Z-- <br />LU~ <br />u<l: 0 <br />zC:: <br />O<.!J 60 <br />uc:: <br />OLU 50 <br />LUe... <br />N(/) <br />::::i~ 40 <br /><l:<l: <br />~c:: <br />C::<.!J 30 ~ <br />00 <br />zc:: 20 <br />U <br />~ <br />Z 10 <br /> 0 <br /> 350 <br /> 300 <br /> 250 <br /> 200 <br /> 150 <br /> 100 <br /> 50 <br /> 0 <br /> STREAM UPPER <br /> ARM <br /> <br />BARIUM <br /> <br /> <br /> <br /> <br />COPPER <br /> <br />LEAD <br /> <br /> <br /> <br />LOWER <br />ARM <br /> <br />ZINC <br /> <br />NEAR DAM <br /> <br /> 1.6 <br /> 1.4 <br /> 1.2 <br /> 0.8 <br /> 0.6 <br />~ 0.4 <br />....J <br />U 0.2 <br />-I- <br />Zz 0 <br />OLU <br />-u 0.45 <br />~c:: <br />c::LU 0.40 <br />I-e... <br />Z-- 0.35 <br />LU~ <br />u<l: 0.30 <br />zC:: <br />O<.!J 0.25 <br />uc:: <br />OLU 0.20 <br />LUe... 0.15 <br />N(/) <br />::::i~ 0.10 <br /><l:<l: <br />~c:: 0.05 <br />C::<.!J <br />00 0 <br />zc:: <br />U 4.5 <br />~ <br />Z 4.0 <br /> 3.5 <br /> 3.0 <br /> 2.5 <br /> 2.0 <br /> 1.5 <br /> 1.0 <br /> 0.5 <br /> 0 UPPER <br /> STREAM <br /> ARM <br /> EXPLANATION <br /> -..- Tenmile Creek <br /> -+- Blue River <br /> - Snake River <br /> <br /> <br />CADMIUM <br /> <br /> <br />IRON <br /> <br /> <br /> <br />NICKEL <br /> <br />LOWER <br />ARM <br /> <br />NEAR DAM <br /> <br />Figure 6. Concentrations of trace elements in clay-normalized sediment cores from the mouth of the streams to the dam at Dillon <br />Reservoir, 1997. [Clay content data were not available for the stream-sediment sample gathered near the mouth of Tenmile Creek. <br />Streambed-sediment concentrations from Deacon and Driver (1999) and Apodaca and others (2000).] <br /> <br />IDENTIFICATION OF WATER.QUALlTY TRENDS 19 <br />