Table 6. Concentrations of volatile organic compounds detected in samples from National Pollutant Discharge Elimination System surface-water sites in residential land-use areas, South-Central Texas study area
[In micrograms per liter; --, not detected]
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Volatile organic compound |
Sampling date |
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8/3/92 |
9/10/92 |
10/29/92 |
11/18/92 |
1/19/93 |
2/3/93 |
2/9/93 |
2/10/93 |
4/3/93 |
4/7/93 |
5/5/93 |
5/18/93 |
5/22/93 |
6/12/93 |
6/20/93 |
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| Methylene chloride | -- | -- | -- | -- | -- | -- | -- | -- | 0.2 | -- | -- | -- | -- | -- | --- |
| .2 | |||||||||||||||
| Tetrachloroethene | -- | -- | -- | -- | -- | -- | -- | -- | .2 | -- | -- | -- | -- | -- | -- |
| .2 | |||||||||||||||
| Toluene | -- | -- | -- | -- | -- | 0.2 | .2 | -- | .3 | -- | .6 | -- | -- | -- | -- |
| .2 | .2 | .3 | .6 | ||||||||||||
| Xylene | -- | -- | -- | -- | -- | .3 | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| .3 | |||||||||||||||
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