Table 3. Number of sites, total number of samples, and number of samples with compounds above detection limit per volatile organic compound for National Pollutant Discharge Elimination System surface-water sites, South-Central Texas study area
| Volatile organic compound |
Number |
Total number of samples |
Number of samples with compound above detection limit |
|
|
|||
| 1,1,1,2-Tetrachloroethane |
6 |
70 |
0 |
| 1,1,1-Trichloroethane |
6 |
70 |
0 |
| 1,1,2,2-Tetrachloroethane |
6 |
70 |
0 |
| 1,1,2-Trichloroethane |
6 |
70 |
0 |
| 1,1-Dichloroethane |
6 |
70 |
0 |
| 1,1-Dichloroethene |
6 |
70 |
0 |
| 1,1-Dichloropropene |
6 |
70 |
0 |
| 1,2,3-Trichlorobenzene |
6 |
70 |
0 |
| 1,2,3-Trichloropropane |
6 |
70 |
0 |
| 1,2,4-Trichlorobenzene |
6 |
106 |
0 |
| 1,2,4-Trimethylbenzene |
6 |
70 |
10 |
| 1,2-Chlorotoluene |
6 |
70 |
0 |
| 1,2-Dibromoethane |
6 |
70 |
0 |
| 1,2-Dichlorobenzene |
6 |
106 |
0 |
| 1,2-Dichloroethane |
6 |
70 |
0 |
| 1,2-Dichloropropane |
6 |
70 |
0 |
| trans-1,2-Dichloroethene |
6 |
70 |
0 |
| 1,3,5-Trimethylbenzene |
6 |
70 |
0 |
| 1,3-Dichlorobenzene |
6 |
106 |
0 |
| 1,3-Dichloropropane |
6 |
70 |
0 |
| 1,4-Chlorotoluene |
6 |
70 |
0 |
| 1,4-Dichlorobenzene |
6 |
106 |
0 |
| 2,2-Dichloropropane |
6 |
70 |
0 |
| 2-Chloroethyl vinyl ether |
6 |
70 |
0 |
| Acrolein |
6 |
70 |
0 |
| Acrylonitrile |
6 |
70 |
0 |
| Benzene |
6 |
70 |
2 |
| Bromobenzene |
6 |
70 |
0 |
| Bromochloromethane |
6 |
52 |
0 |
| Bromoform |
6 |
70 |
0 |
| Bromodichloromethane |
6 |
70 |
0 |
| Carbon tetrachloride |
6 |
70 |
0 |
| Chlorobenzene |
6 |
70 |
0 |
| Chloroethane |
6 |
70 |
0 |
| Chloroform |
6 |
70 |
0 |
| cis-1,2-Dichloroethene |
6 |
70 |
0 |
| cis-1,3-Dichloropropene |
6 |
70 |
0 |
| Dibromochloromethane |
6 |
70 |
0 |
| Dibromochloropropane |
6 |
70 |
0 |
| Dibromomethane |
6 |
70 |
0 |
| Dichlorodifluoromethane |
6 |
70 |
0 |
| Trichlorotrifluoroethane |
6 |
52 |
0 |
| Ethylbenzene |
6 |
70 |
2 |
| Hexachlorobutadiene |
6 |
106 |
0 |
| Isopropylbenzene |
6 |
70 |
0 |
| Methyl bromide |
6 |
70 |
0 |
| Methyl chloride |
6 |
70 |
0 |
| Methylene chloride |
6 |
70 |
4 |
| Methyl-tert-butyl ether |
6 |
52 |
6 |
| n-Butylbenzene |
6 |
70 |
0 |
| n-Propylbenzene |
6 |
70 |
0 |
| Naphthalene |
6 |
106 |
6 |
| p-Isopropyltoluene |
6 |
70 |
0 |
| sec-Butylbenzene |
6 |
70 |
0 |
| Styrene |
6 |
70 |
0 |
| tert-Butylbenzene |
6 |
70 |
0 |
| Tetrachloroethene |
6 |
70 |
6 |
| Toluene |
6 |
70 |
16 |
| trans-1,3-Dichloropropene |
6 |
70 |
0 |
| Trichloroethene |
6 |
70 |
0 |
| Trichlorofluoromethane |
6 |
70 |
0 |
| Vinyl chloride |
6 |
70 |
0 |
| Xylene |
6 |
70 |
10 |
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