Table 8. Number of sites, total number of samples, and number of samples with compounds above detection limit per volatile organic compound for other U.S. Geological Survey surface-water sites, South-Central Texas study area
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| Volatile organic compound | Number of sites |
Total number of samples |
Number of samples with compound above detection limit |
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| 1,1,1,2-Tetrachloroethane |
8 |
68 |
0 |
| 1,1,1-Trichloroethane |
15 |
82 |
2 |
| 1,1,2,2-Tetrachloroethane |
15 |
82 |
0 |
| 1,1,2-Trichloroethane |
15 |
82 |
0 |
| 1,1-Dichloroethane |
15 |
82 |
0 |
| 1,1-Dichloroethene |
15 |
82 |
0 |
| 1,1-Dichloropropene |
8 |
68 |
0 |
| 1,2,3-Trichlorobenzene |
8 |
68 |
0 |
| 1,2,3-Trichloropropane |
8 |
68 |
0 |
| 1,2,4-Trichlorobenzene |
8 |
70 |
0 |
| 1,2,4-Trimethylbenzene |
8 |
68 |
1 |
| 1,2-Chlorotoluene |
8 |
68 |
0 |
| 1,2-Dibromoethane |
11 |
77 |
0 |
| 1,2-Dichlorobenzene |
11 |
79 |
0 |
| 1,2-Dichloroethane |
15 |
82 |
0 |
| 1,2-Dichloropropane |
9 |
79 |
0 |
| trans-1,2-Dichloroethene |
9 |
79 |
0 |
| 1,3,5-Trimethylbenzene |
8 |
68 |
0 |
| 1,3-Dichlorobenzene |
11 |
79 |
0 |
| 1,3-Dichloropropane |
8 |
68 |
0 |
| 1,4-Chlorotoluene |
8 |
68 |
0 |
| 1,4-Dichlorobenzene |
11 |
79 |
0 |
| 2,2-Dichloropropane |
8 |
68 |
0 |
| 2-Chloroethyl vinyl ether |
15 |
82 |
0 |
| Acrolein |
5 |
60 |
0 |
| Acrylonitrile |
5 |
60 |
0 |
| Benzene |
15 |
82 |
0 |
| Bromobenzene |
8 |
68 |
0 |
| Bromochloromethane |
8 |
65 |
0 |
| Bromoform |
15 |
82 |
11 |
| Bromodichloromethane |
15 |
82 |
18 |
| Carbon tetrachloride |
15 |
82 |
0 |
| Chlorobenzene |
15 |
82 |
0 |
| Chloroethane |
15 |
82 |
21 |
| Chloroform |
15 |
82 |
0 |
| cis-1,2-Dichloroethene |
9 |
70 |
6 |
| cis-1,3-Dichloropropene |
11 |
77 |
0 |
| Dibromochloromethane |
15 |
82 |
15 |
| Dibromochloropropane |
8 |
68 |
0 |
| Dibromomethane |
8 |
68 |
0 |
| Dichlorodifluoromethane |
15 |
82 |
0 |
| Trichlorotrifluoroethane |
8 |
65 |
0 |
| Ethylbenzene |
9 |
68 |
0 |
| Hexachlorobutadiene |
8 |
70 |
0 |
| Isopropylbenzene |
8 |
68 |
0 |
| Methyl bromide |
9 |
68 |
0 |
| Methyl chloride |
11 |
77 |
0 |
| Methylene chloride |
15 |
82 |
3 |
| Methyl-tert-butyl ether |
8 |
65 |
0 |
| n-Butylbenzene |
8 |
68 |
0 |
| n-Propylbenzene |
8 |
68 |
0 |
| Naphthalene |
8 |
70 |
0 |
| p-Isopropyltoluene |
8 |
68 |
0 |
| sec-Butylbenzene |
8 |
68 |
0 |
| Styrene |
11 |
77 |
0 |
| tert-Butylbenzene |
8 |
68 |
0 |
| Tetrachloroethene |
15 |
82 |
8 |
| Toluene |
15 |
82 |
2 |
| trans-1,3-Dichloropropene |
11 |
77 |
0 |
| Trichloroethene |
15 |
82 |
9 |
| Trichlorofluoromethane |
15 |
82 |
2 |
| Vinyl chloride |
15 |
82 |
0 |
| Xylene |
11 |
77 |
0 |
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