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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
of sites

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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