Tiered Development of Human Health PCLs Page: 4
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Tiered Development of Human Health PCLs under TRRP
the latter situation. As an example of a PCL that may not be protective, assume
the Tier 1 soil leachate PCL (i.e., GWSoil) is met, but groundwater-monitoring
data indicate that COC concentrations in the groundwater source area are
worsening. Unless there is another source of the groundwater contamination,
the leaching of COCs from the original affected soil is the likely cause. In this
instance, the soil PCL is either not protective or the soil PCL is exceeded by
remaining COC concentrations. Either the adequacy of the soil PCL or the soil
needs to be further evaluated to determine if the PCL actually is exceeded in
the soil. If the Tier 1 PCL is determined not to be protective of groundwater,
then development of a sufficiently site-specific PCL under Tier 2 or Tier 3 is an
available option.Revised April 2013
TCEQ publication RG-366/TRRP-22
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Texas Commission on Environmental Quality. Remediation Division. Tiered Development of Human Health PCLs, pamphlet, April 2013; Austin, Texas. (https://texashistory.unt.edu/ark:/67531/metapth624526/m1/4/?rotate=90: accessed July 16, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.