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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