May 21, 2001
Subsequent to publication of U.S. Geological Survey Circular 1212, “Water Quality in South-Central Texas,” errors were found in figure 11 on page 17.
A correct figure 11 is shown below with the following revisions:
Volatile organic compounds, frequency of detection, in percent—
Edwards aquifer
Nonurban recharge zone: Added dichloromethane
Confined zone: Added chlorodibromomethane; increased 2-butanone from 14 to 17 percent
Trinity aquifer: Added iodomethane
We apologize for the inconvenience of this errata sheet.
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| Figure 11. Pesticides and VOCs in the Edwards aquifer were most frequently detected in urban recharge-zone wells. Shown are those pesticides and VOCs detected in more than 10 percent of samples. Only one insecticide, p,p’-DDE (shaded brown), a breakdown product of DDT, was detected in more than 10 percent if samples; the other pesticides shown here are herbicides. |
A pdf of the errata sheet is available--791KB