Table 7. Concentrations of volatile organic compounds detected in samples from National Pollutant Discharge Elimination System surface-water sites in light industrial 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 | 11/18/92 | 1/19/93 | 2/3/93 | 2/9/93 | 2/25/93 | |
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| Methylene chloride | -- | -- | -- | 0.2 | -- | -- |
| .2 | ||||||
| Toluene | -- | -- | -- | -- | -- | 0.2 |
| .2 | ||||||
| Xylene | -- | -- | 0.2 | -- | -- | .2 |
| .2 | .2 | |||||
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