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

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Table 4. Comparison of environmental and pre-processing split-replicate samples for general chemical constituents-Continued

[Env., environmental sample; Split, pre-processing split-replicate sample; Diff. 1, difference in units of constituent; Diff. 2, difference in lowest rounding unit; mg!L, milligrams
per liter; J..lg!L, micrograms
per liter; J..lS/cm, microsiemens per centimeter at 25 degrees Celsius; shaded cells represent differences greater than plus or minus llowest rounding unit; lowest rounding unit is equal
to the magnitude of
the least significant figure]

Silica
Station Date Env. Split Ditt.1
(mg/L) (mglL) (mglL) Ditt.2
Gunnison near 090596 13 13 0 0
Grand Junction
Gore 102495 5.4 5.4 0 0
Uncompahgre 072596 10 10 0 0
French 090996 9.5 9.4 0.1 1
Dry 082996 20 19 1 1
Dry Fork 071596 16 16 0 0
Baker 071696 6.7 6.6 0.1 1
Maximum difference 1 1
Percent of samples with 57 57
no difference
Percent of samples 100
within plus or minus 1
lowest rounding unit

Iron Manganese
Env. Split Ditt.1 Ditt.2 Env. Split Ditt.1
(J..lg/L) (J..lglL) (J..lg/L) (J..lglL) (J..lg/L ) (J..lglL)
3 3 0 0 15 14 1
3 3 0

o

Ditt.2

3 3 0 0
9 9 0 0
130 120 10 1
10 -4
71 71
86 86

Laboratory pH Laboratory specific conductance Residue on evaporation
Station Date Env. Split Ditt.1 Env. Split Ditt.1 Env. Split Ditt.1
(standard units) Ditt.2 (J..lS/cm) (J..lS/cm) (J..lS/cm) Ditt.2 (mglL) (mg/L) (mgIL) Ditt.2
Gunnison near 090596
Grand Junction
Gore 102495
Uncompahgre 072596
French 090996
Dry 082996
Dry Fork 071596
Baker 071696
Maximum difference -0.2 -2 -10 :t2 -30 11
Percent of samples with 57 57 14 14 14 14
no difference
Percent of samples 71 43 14
within plus or minus 1
lowest rounding unit