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Table 7. Results of rank-sum tests between Wasatch aquifer and coalbed aquifers

[Bold text indicates a statistically significant difference with a p-value less than 0.05]

Constituent or major ion

Rank-sum test probability
(p-value)

Dissolved solids

0.5261

Calcium

0.4913

Magnesium

0.7997

Sodium

0.9710

Potassium

0.4659

Bicarbonate

0.1538

Chloride

0.5622

Sulfate

0.0001

Fluoride

0.0221

Silica

0.9706

 

Table 8. Kendall's tau correlation coefficients and resulting probabilities (p-values) between dissolved solids or major ions and well depth, Wasatch aquifer

[Bold text indicates a statistically significant correlation with a p-value less than 0.05] 

Constituent or major ion

Kendall's tau correlation coefficient

Probability
(p-value)

Dissolved solids

-0.62

0.07

Calcium

-0.93

0.0004

Magnesium

-0.57

0.062

Sodium

-0.46

0.144

Potassium

-0.43

0.178

Bicarbonate

0.24

0.562

Chloride

-0.36

0.360

Sulfate

-0.79

0.0056

Fluoride

0.54

0.084

Silica

-0.14

0.72

 

Table 9. Kendall's tau correlation coefficients and resulting probabilities (p-values) between dissolved solids or major ions and well depth, coalbed aquifers

[Bold text indicates a statistically significant correlation with a p-value less than 0.05; NC, not calculated because greater than 50 percent of data values are less than minimum reporting level]

Constituent or major ion

Kendall's tau correlation coefficient

Probability (p-value)

Dissolved solids

0.179

0.393

Calcium

0.115

0.5822

Magnesium

0.217

0.297

Sodium

0.167

0.4228

Potassium

0.462

0.0256

Bicarbonate

0.231

0.2721

Chloride

-0.256

0.2224

Sulfate

NC

NC

Fluoride

-0.026

0.902

Silica

0.308

0.1301

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