Tiered Development of Human Health PCLs Page: 11
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Tiered Development of Human Health PCLs under TRRP
flow gradients, and the thickness of the groundwater-bearing unit, for
example.
At a minimum, establish PCLs for all "complete or reasonably anticipated to be
completed" exposure pathways [ 350.71(c)]. See Table 5 for the minimum
exposure pathways that apply for the different environmental media. As
indicated in Table 5, land use and groundwater classification control the
applicability of certain exposure pathways. Because no Tier 1 or 2 procedures
are provided for them, PCLs for "other complete or reasonably anticipated to
be completed" exposure pathways are established under Tier 3.
Table 5. Source Medium, Mandatory Exposure Pathways and PCLs.
Source Medium Complete or Reasonably Anticipated to Be Completed Exposure PCL
Pathways
Residential: Combined ingestion, dermal contact, inhalation of volatiles
and particulates, and ingestion of above-ground and below-ground
Surface Soil vegetables with COCs in soil. TotSo Comb
Commercial/Industrial: Combined ingestion, dermal contact, and
inhalation of volatiles and particulates of COCs in soil.
Subsurface Soil Inhalation of volatile COCs from soil. AirSoilnh-V
Surface and GWSoilng or
Subsurface Soil Soil-to-groundwater leaching of COCs to Class 1 and 2 groundwater. GWSoilIa ML
Surface Soil Soil-to-groundwater leaching of COCs to Class 3 groundwater. GSolibass3
Class 1 Groundwater Ingestion of COCs in Class 1 groundwater. nGW dry or
Class 2 Groundwater Ingestion of COCs in Class 2 groundwater. GWGWIng or
GWSecondary MCL*
Class 3 Groundwater COCs in Class 3 groundwater. GWGWCiass 3
Class 2 and 3 Inhalation of volatile COCs from Class 1, 2 or 3 groundwater. GWInh-V
Groundwater
All environmental Other complete or reasonably anticipated to be completed exposure Other
media pathways.
*For Class 2 groundwater, secondary MCLs only apply if a potable water well is impacted or threatened, or if the
Class 2 groundwater is the only water supply source [ 350.74(f)(3)(B) and (C)].
Land Use Classification
Human health PCLs are either based on residential or commercial/industrial
land use scenarios as defined in 350.4(a). Determine the land use for each
tract of land within the affected property in advance of PCL development, but
residential land use is the default and can be assumed for any property. See
TCEQ guidance documents Land Use Classification (RG-366/TRRP-7) and
Institutional Controls (RG-366/TRRP-16) for further information and
requirements regarding commercial/industrial land use.Revised April 2013
TCEQ publication RG-366/TRRP-22
11i
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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/m1/11/?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.