Table 5. Concentrations of volatile organic compounds detected in samples from National Pollutant Discharge Elimination System surface-water sites in commercial 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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| 9/10/92 | 10/29/92 | 11/18/92 | 1/19/93 | 2/25/93 | 2/28/93 | 3/12/93 | 3/30/93 | 4/3/93 | 4/7/93 | 4/29/93 | 5/5/93 | 6/26/93 | |
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| 1,2,4-Trimethylbenzene | 0.5 | 0.3 | 0.2 | -- | -- | 0.2 | -- | -- | -- | -- | -- | 0.3 | -- |
| .5 | .3 | .2 | .2 | .3 | |||||||||
| Benzene | -- | -- | -- | -- | -- | .2 | -- | -- | -- | -- | -- | -- | -- |
| .2 | |||||||||||||
| Ethyl benzene | -- | -- | .2 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| .2 | |||||||||||||
| Methyl-tert-butyl ether | -- | -- | -- | 1.0 | 1.8 | -- | -- | -- | -- | -- | -- | -- | |
| 1.0 | 1.0 | 1.8 | |||||||||||
| Naphthalene | -- | .2 | -- | -- | -- | .3 | -- | -- | -- | -- | -- | -- | -- |
| .2 | .3 | ||||||||||||
| .2 | .3 | ||||||||||||
| Tetrachloroethene | -- | -- | -- | -- | -- | -- | -- | .7 | .4 | -- | -- | -- | -- |
| .7 | .4 | ||||||||||||
| Toluene | -- | -- | .2 | -- | .2 | .2 | -- | -- | -- | -- | -- | -- | -- |
| .2 | .2 | .2 | |||||||||||
| Xylene | -- | -- | .3 | -- | -- | .2 | -- | -- | -- | -- | -- | -- | -- |
| .3 | .2 | ||||||||||||
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