WSP05652

• File Number: 8273.300
• Description: Colorado River Basin Salinity Control - Federal Agency Reports - USGS
• Basin: Colorado Mainstem
• Water Division: 5
• Date: 1/1/1997
• Author: USGS
• 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
• Water Supply Pro - Doc Type: Report/Study

OLL.O
Table 4. Comparison of environmental and pre-processing split-replicate samples for general chemical constituents
[Env" environmental sample; Split. pre-prQces~ing split-replicate s-omplc; Diff. I, dlfft"rence in units ofconstituem, Ditl. 2. difference in lowesl rounding unit; mg/L. milligrams per liler: /lg!L, microgmms
per liler; ~Slcm. microSleme-ns per centimeter al 25 degrees Cebius; ~haded cdls repre~enl differences grealer than plus or minus I lowest roumJmg unll: lowest rounding unit is t"4ual to the magnitude of
the least ~lgnirl(,:lnl figure]
Calcium Magnesium Sodium Potassium
Station Date Env. Split Dill. 1 Env. Split Dill. 1 Env. Split Dill. 1 Env. Split Dill. 1
(mg/L) (mglL) (mglL) Dill. 2 (mglL) (mglL) (mg/L) Dill. 2 (mglL) (mgIL) (mg/L) Dill. 2 (mg/L) (mgIL) (mgIL) Dill. 2
Gunnison near V9V596 120 120 0 0 33 33 0 0 53 53 0 0 3.5 3.5 0 0
Grand Junction
Gore 102495 46 47 -I -1 7.8 7.9 --0.1 -1 5.1 5.3 0 0 1.1 1.1 0 0
Uncolllpahgre 072596 86 90 -4 -4 10 10 0 0 17 t7 0 0 1.8 1.9 -01 -I
French 090996 35 34 1 I 5.5 5.6 --O.t -1 2 2 0 0 I I.t -0.1 -1
Dry 082996 170 170 0 0 .16 37 -1 -1 47 47 0 0 2.7 2.6 V.I I
Dry Fork 071596 83 83 0 V 130 130 0 0 300 310 -10 -1 2.7 2.9 -0.2 -2
Bak.er 071696 6.8 6.8 0 0 1.7 1.7 0 0 1.4 1.4 0 0 0.6 0.7 -0.1 -1
Maximum difference -4 -4 -1 -i -10 -1 -0.2 -2
Percent of samples with 57 57 57 57 86 86 29 29
no difft'rence
Percent of s.amples 86 100 100 86
within plus or minus I
10wesI rounding unit
Sulfate Chloride Fluoride Laboratory alkalinity
Station Date Env. Split om. 1 Env. Split Dill. 1 Env. Split Diff.1 Env. Split 01111.
0 (mg/L) (mglL) (mglL) Dill. 2 (mglL) (mglL) (mg/L) 0111.2 (mg/L) (mglL) (mglL) Oiff.2 (mg/L) (mglLl (mg/L) Diff.2
<:
)- Gunnison near 090596 390 390 0 0 7.1 7.2 -0.1 -I 0.5 0.5 0 0 158 158 0 0
r-
~ Grand Junction
h Gore 102495 40 40 0 0 8.1 8 0.1 t 0.2 0.2 0 0 \09 109 0 0
0 0.5 0 117 117 0
z Uncompahgre 072596 i70 170 0 0 3 3 I) 0 V.5 0 0
....
" French 090Y96 81 82 -I -I I 1.1 --0.1 -I 0.1 0.1 I) 0 36 36 0 0
0
r- Dry 082996 450 450 0 0 5.9 6.1 --0.2 -2 0.9 0.9 0 0 222 218 4 4
en
)0 Dry Fork 071596 950 960 -10 -t 9.4 9.5 -0.1 -I 0.3 0.3 0 0 358 360 -2 -2
~
" Baker 071696 4.1 4.2 -0.1 -1 0.1 0.1 0 0 0.3 0.2 0.1 I 24 24 0 0
r-
Z Maximum difference -10 -I -D,1 -2 0.1 I 4 4
Gl
" Percent of samples with 57 57 29 29 86 86 71 71
"
0 no difference
Gl
" Percent of samples 100 86 IlX.l 71
)0
~ within plus or minus 1
lowest n>unding unit
....