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Table 4.  Detections of volatile organic compounds in samples from National Pollutant Discharge Elimination System surface-water sites, South-Central Texas study area

[In percent detections. Numbers in parentheses are number of detections per total number of samples.]


Station number

1,2,4-
Trimethyl- benzene

Ben-
zene

Ethyl- benzene

Methy-
lene Chloride

Methyl- tertbutyl- ether

Naphtha-
lene

Tetra- chloro- ethene

Toulene

Xylene


8177720

67 (8/12)

17 (2/12)

17 (2/12)

  0 (0/12)

 100 (6/6)

33 (6/18)

  0 (0/12)

50 (6/12)

33 (4/12)

8178420

17 (2/12)

  0 (0/12)

  0 (0/12)

  0 (0/12)

     0 (0/12)

  0 (0/19)

33 (4/12)

  0 (0/12)

  0 (0/12)

8178430

  0 (0/10)

  0 (0/10)

  0 (0/10)

  0 (0/10)

     0 (0/10)

  0 (0/15)

20 (2/10)

  0 (0/10)

  0 (0/10)

8178520

  0 (0/12)

  0 (0/12)

  0 (0/12)

  0 (0/12)

     0 (0/4)

  0 (0/18)

  0 (0/12)

17 (2/12)

17 (2/12)

8178690

  0 (0/12)

  0 (0/12)

  0 (0/12)

17 (2/12)

      0 (0/12)

  0 (0/18)

  0 (0/12)

50 (6/12)

  0 (0/12)

8178820

  0 (0/12)

  0 (0/12)

  0 (0/12)

17 (2/12)

     0 (0/8)

  0 (0/18)

  0 (0/12)

17 (2/12)

33 (4/12)


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