9409

• UCREFRP Catalog Number: 9409
• Author: Spahr, N. E. and R. W. Boulger.
• Title: Interim Results of Quality-Control Sampling of Surface Water for the Upper Colorado River national Water-Quality Assessment Study Unit, Water Years 1995-96.
• USFW Year: 1997.
• USFW - Doc Type: 97-4227,
• Copyright Material: NO

STATE LINE
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CJ GUNNISON 0
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J F M A M J J S 0 N D J F M A M J J A S 0 N D
1995 I 1996 I
DATE

Figure 4. Distribution of collection of post-processing split-replicate samples, 1995-96.

Eight post-processing split-replicate samples
were collected during water years 1995-96.
Comparisons of split A and split B samples
for major chemical, nutrient, and organic carbon
constituents are presented in the following sections.
Post-processing split-replicate data for trace
elements are not presented because only one
sample for trace elements was collected.

Comparison of General Chemical Constituents

Results of comparison between post-processing
split samples for general chemical constituents are
listed in table 13. A summary of the differences

between split A and split B samples for the constitu-
ents listed in table 13 is given in table 14. Shaded
cells in table 13 represent differences greater than
plus or minus 1 rounding unit. The majority of the
differences agree within plus or minus 1 lowest
rounding unit with the exception of residue on evapo-
ration. The differences in residue on evaporation
probably reflect the precision of the laboratory
method. Variability associated with sample shipment
and analysis for general chemical constituents is low
and will have little effect on interpretation of environ-
mental data.

QUALITY-CONTROL SAMPLING PROGRAM 25