Tier 1 PCL Tables Page: 4
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TCEQ publication RG-366/TRRP-23
Develop human health RBELs for each
land use and exposure pathway for the
carcinogenic and noncarcinogenic
endpoint for each COC.
(see 350.74)
Develop Tier 1 PCLs for each land use
and exposure pathway for the
carcinogenic and noncarcingenic
endpoint for each COC
(see 350.75)
Develop combined PCLs for each land
use and exposure pathway for the
carcinogenic and noncarcinogenic
endpoint for each COC from the
individual exposure pathways
(TOtSoilComb.
Compare the carcinogenic and
noncarcinogenic PCLs for each
exposure pathway and select the
lowest of the two as the PCL for that
land use, exposure pathway, and COC
as the Tier 1 PCL value.Tables 9 and 10
Tables 6, 7, and 8
Tables 4 and 5
Tables 1, 2 and 3Figure 1. Process used to develop the Tier 1 PCL table values.
" the COCs are present in Class 1 groundwater,
" the COCs are in Class 2 groundwater and wells are threatened, or
" when the COCs are in Class 2 groundwater that is the only
alternative for a water supply.
When the secondary Maximum Contaminant Level is used as the PCL, the
soil PCL GW Secondary MCL iS used in lieu Of SOil.ng
Please note that many of the tables contain important footnotes that define
various abbreviations used in the tables as well as instruct the user on the
implementation of the table and refer the user to specific sections of the
rule. All values presented in the Tier 1 lookup table have been rounded to
two significant figures. Keep this rounding in mind when trying to
duplicate the Tier 1 PCLs listed in the tables.Revised March 2009
Tier 1 PCL Tables
4
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Texas Commission on Environmental Quality. Tier 1 PCL Tables, text, March 2009; (https://texashistory.unt.edu/ark:/67531/metapth624659/m1/4/: accessed March 28, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu; crediting UNT Libraries Government Documents Department.