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Table 4. Comparison of environmental and pre-processing split-replicate samples for general chemical constituents [Env., environmental sample; Split, pre-processing split-replicate sample; Diff. I, difference in units of constituent; Diff. 2, difference in lowest rounding unit; mg/L, milligrams per liter; I1g/L, micrograms per liter; I1S/cm, microsiemens per centimeter at 25 degrees Celsius; shaded cells represent differences greater than plus or minus I lowest rounding unit; lowest rounding unit is equal to the magnitude of the least significant figure] Calcium Magnesium Sodium Potassium Station Date Env. Split Diff.1 Env. Split Diff.1 Env. Split Diff.1 Env. Split Diff.1 (mglL) (mg/L) (mglL) Diff.2 (mg/L) (mg/L) (mg/L) Diff.2 (mglL) (mglL) (mg/L) Diff.2 (mglL) (mg/L) (mg/L) Diff.2 Gunnison near 090596 120 120 0 0 33 33 0 0 53 53 0 0 3.5 3.5 0 0 Grand Junction Gore 102495 46 47 -1 -1 7.8 7.9 -0.1 -1 5.3 5.3 0 0 1.1 1.1 0 0 Uncompahgre 072596 10 10 0 0 17 17 0 0 1.8 1.9 -0.1 -1 French 090996 5.5 5.6 -0.1 -1 2 2 0 0 1 1.1 -0.1 -1 Dry 082996 170 0 0 36 37 -1 -1 47 47 0 0 2.7 2.6 0.1 1 Dry Fork 071596 83 0 0 130 130 0 0 300 310 -10 -1 Baker 071696 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 -1 -10 -1 -0.2 -2 Percent of samples with 57 57 57 57 86 86 29 29 no difference Percent of samples 86 100 100 86 within plus or minus 1 lowest rounding unit Sulfate Chloride Fluoride Laboratory alkalinity Station Date Env. Split Diff.1 Env. Split Diff.1 Env. Split Diff.1 Env. Split Diff 1. 0 (mg/L) (mg/L) (mg/L) Diff.2 (mg/L) (mg/L) (mg/L) Diff.2 (mglL) (mg/L) (mg/L) Diff.2 (mglL) (mglL) (mg/L) Diff.2 c: )> Gunnison near 090596 390 390 0 0 7.1 7.2 -0.1 -1 0.5 0.5 0 0 158 158 0 0 r- ~ Grand Junction (, Gore 102495 40 40 0 0 8.1 8 0.1 1 0.2 0.2 0 0 109 109 0 0 0 z Uncompahgre 072596 170 170 0 0 3 3 0 0 0.5 0.5 0 0 117 117 0 0 -I ::a French 090996 81 82 -1 -1 1 1.1 -0.1 -1 0.1 0.1 0 0 36 36 0 0 0 r- Dry 082996 450 450 0 0 0.9 0.9 0 0 Ul )> Dry Fork 071596 950 960 -10 -1 0.3 0.3 0 0 s: "ll Baker 071696 4.1 4.2 -0.1 -1 0.1 0.1 0 0 0.3 0.2 0.1 1 24 24 0 0 r- Z Maximum difference -10 -1 -0.2 -2 0.1 1 4 4 C) "ll Percent of samples with 57 57 29 29 86 86 71 71 ::a 0 no difference C) ::a Percent of samples 100 86 100 71 )> s: within plus or minus 1 lowest rounding unit .....