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<br />program requires that quality-control samples be
<br />collected at sites within the surface-water network
<br />(T.L. Miller, U.S. Geological Survey, wrinen
<br />commun., 1996).
<br />Qualily-control samples provide part of the
<br />information needed to estimate the bias and variability
<br />that result from sample collection, processing, and
<br />analysis. The results are used to evaluate possible
<br />effects of bias and variability on the interpretation
<br />
<br />of environmental data. Two specific objectives for
<br />evaluating bias and variability are to detemline the
<br />extent to which (l) sampling methods and equipment
<br />introduce contaminants (bias) into water-quality
<br />samples; and (2) sample processing and handling
<br />affect the variability of measured constituent concen-
<br />trations (T.L. Miller, U.S. Geological Survey, written
<br />commun., 1996).
<br />
<br />Upper Colorado River Basin
<br />study unit
<br />../
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<br />
<br />UTAH
<br />
<br />
<br />.9
<br />
<br />EXPLANA nON
<br />SAMPLING SITE AND Nt fMBER
<br />
<br />20
<br />
<br />40 MILES
<br />
<br />o
<br />
<br />20
<br />
<br />40 KILOMETERS
<br />
<br />Figure 1. Location of sampling sites (numbers refer to table 1).
<br />
<br />2 Interim Results of Quality-Control Sampling of Surface Water for the Upper Colorado River National Water-Quality
<br />Assessment Study Unit, Water Years 1995-96
<br />
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