Joint Groundwater Monitoring and Contamination Report: 1994 Page: 42
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sampling of existing monitoring wells with added analytical parameters. If a landfill has no monitor
wells, or poorly sited monitor wells, MSW has required the permittee to perform a ground-water
assessment and, based on the results of the assessment, to install appropriate monitoring wells with
subsequent sampling and analysis. If further investigation indicated probable contamination, the permittee
would be required to initiate a ground-water characterization study, potentially leading to remediation.
Under the new rules, the permittee is to perform statistical analysis on its site's detection monitoring
analyses. If statistical analysis indicates that a statistically significant change in constituent concentration
has occurred from background concentrations, the site may resample. If resampling confirms a
statistically significant change, the site then becomes subject to the requirements of "assessment
monitoring" for additional parameters. This may, in turn, lead to directives for corrective action and/or
remediation. During the past year, ground-water characterizations have been in progress at approximately
30 sites, and corrective action has been under way at approximately twelve sites.
At approximately 25 landfills, the permittee is required to perform an annual earth electrical resistivity
survey. around the perimeter of the site. This geophysical method is effective in some soils for
determining the location of possible contaminant plumes. When contamination plumes are suspected,
additional investigation is required, usually leading to the installation of monitoring wells and potentially
to remediation.
Status of Ground-Water Contamination
Ground-water contamination has been confirmed at the 27 MSW sites listed by county in Table 1 under
the heading "MSW". Of those 27 sites, contamination has been found in about 120 samples from an
estimated 65 wells. Three of the 27 contamination cases are new to the 1994 report and one of them
required the notification of local officials under Texas Water Code 5.236. No sites listed in the 1993
report have been deleted.42
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Texas Groundwater Protection Committee. Joint Groundwater Monitoring and Contamination Report: 1994, report, April 1995; Austin, Texas. (https://texashistory.unt.edu/ark:/67531/metapth1587502/m1/50/: accessed July 17, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu; crediting UNT Libraries Government Documents Department.