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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


Volatile organic compound Number
of sites
Total number
of samples
Number of samples with compound above detection limit

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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