Table 4. Calculated relative-percent differences between normal environmental and replicate ground-water samples
[mg/L, milligrams per liter; CaCO3, calcium carbonate; TU, tritium units; <MRL, less than minimum reporting level; NC, not calculated because both normal environmental sample and replicate sample were less than minimum reporting level; ‰, per mil or parts per thousand]
|
Characteristic or constituent |
Sample 1 |
Sample 2 |
||||
|---|---|---|---|---|---|---|
|
Normal environmental sample |
Replicate sample |
Relative- percent difference1 |
Normal environmental sample |
Replicate sample |
Relative- percent difference1 |
|
|
Acid-neutralizing capacity (ANC), laboratory (mg/L as CaCO3) |
580 |
580 |
0 |
267 |
267 |
0 |
|
Dissolved solids, calculated sum (mg/L) |
624 |
622 |
<1 |
4,020 |
4,020 |
0 |
|
Hardness, total (mg/L as CaCO3) |
120 |
120 |
0 |
2,500 |
2,500 |
0 |
|
Sodium-adsorption ratio (SAR) |
8 |
8 |
0 |
2 |
2 |
0 |
|
Calcium, dissolved (mg/L) |
25 |
26 |
4 |
550 |
550 |
0 |
|
Magnesium, dissolved (g/L) |
14 |
14 |
0 |
280 |
270 |
14 |
|
Sodium, dissolved (mg/L) |
190 |
190 |
0 |
270 |
260 |
14 |
|
Potassium, dissolved (mg/L) |
13 |
12 |
8 |
14 |
14 |
0 |
|
Bicarbonate, calculated from ANC2 (mg/L) |
707 |
707 |
0 |
326 |
326 |
0 |
|
Chloride, dissolved (mg/L) |
7 |
7 |
0 |
18 |
17 |
3 |
|
Sulfate, dissolved (mg/L) |
1.2 |
1.2 |
0 |
2,700 |
2,700 |
0 |
|
Fluoride, dissolved (mg/L) |
1.1 |
1.1 |
0 |
0.3 |
0.3 |
0 |
|
Silica, dissolved (mg/L) |
20 |
20 |
0 |
17 |
16 |
6 |
|
Tritium, TU |
<MRL |
<MRL |
NC |
6 |
9 |
40 |
|
d2H (‰) |
-151.0 |
-150.3 |
<1 |
-147.8 |
-147.2 |
<1 |
|
d18O (‰) |
-19.99 |
-19.94 |
<1 |
-19.03 |
-19.02 |
<1 |
1Value rounded to nearest percent.
2Equivalent bicarbonate concentrations calculated from acid-neutralizing capacity (ANC) concentrations by dividing ANC concentrations (expressed as milligrams per liter of calcium carbonate) by 0.8202 (Hem, 1985, p. 57).
