Table 9. Number of detections and range in concentration of volatile organic compounds detected in samples from Edwards aquifer wells, South-Central Texas study area
[mg/L, micrograms per liter]
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| Volatile organic compound | Number of detections | Range in concentration (µg/L) |
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| 1,1,1-Trichloroethane |
3 |
0.2–.4 |
| 1,1,2,2-Tetrachloroethane |
1 |
1 |
| 1,1-Dichloroethane |
9 |
.2–1.8 |
| 1,1-Dichloroethene |
1 |
.4 |
| 1,2-Dibromomethane |
1 |
.7 |
| 1,2-Dichlorobenzene |
2 |
.3–.7 |
| 1,2-Dichloroethane |
15 |
.2–.6 |
| 1,2-Dichloropropane |
14 |
.2–3.0 |
| trans-1,2-Dichloroethene |
16 |
.2–4.6 |
| 1,3-Dichlorobenzene |
1 |
4 |
| 1,4-Dichlorobenzene |
11 |
.2–9.5 |
| Benzene |
3 |
.2–15 |
| Bromoform |
26 |
.2–13 |
| Bromodichloromethane |
15 |
.2–13 |
| Chlorobenzene |
3 |
.2–2.4 |
| Chloroethane |
1 |
.2 |
| Chloroform |
23 |
.2–22 |
| Dibromochloromethane |
20 |
.2–9.7 |
| Dichlorodifluoromethane |
12 |
.2–4.0 |
| Ethylbenzene |
8 |
.2–4.7 |
| Methyl chloride |
1 |
.3 |
| Methylene chloride |
16 |
.6–14 |
| Tetrachloroethene |
95 |
.2–120 |
| Toluene |
13 |
.2–1.8 |
| Trichloroethene |
33 |
.2–130 |
| Trichlorofluoromethane |
12 |
.2–5.0 |
| Vinyl chloride |
1 |
.3 |
| Xylene |
3 |
.2–4.1 |
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