Tiered Development of Human Health PCLs Page: 9
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Tiered Development of Human Health PCLs under TRRP
guidance document Application ofRemedy Standards A and B(RG-
366/TRRP-28).
Include the following in Tier 3 NAF model submittals:
" Description of the precise intentof the Tier 3 model simulation or
calculation (purpose);
" Description of the Tier 3 physical model (physical, chemical, hydraulic,
etc.) with references;
" Description of the Tier 3 mathematical model (derivation of equations,
etc.) with references;
" Description of any commercial or proprietary software product used to
determine Tier 3 PCLs;
" Descriptions of standard methods by which empirical or site-specific
data are determined (laboratory methods, field methods, etc.);
" Analysis of site calibration statistics for predictive simulation models
(hydraulic, chemical, etc.);
" Discussion of simulation prediction results for period up to and beyond
the reasonable timeframe;
" Appendices for all input and output data associated with model
calculations and/or simulations;
" CD-ROM or other electronic file containing all set-up and input data files
associated with model simulations that allow TCEQ to review
simulations directly.
With regard to providing documentation for the model, the person can provide
a reference to publicly available literature or a Web page address where the
information can be readily accessed at no charge to TCEQ.
Key Considerations in Human Health PCL Development
Before developing PCLs, some critical information about the affected property
must be determined. Table 4 references key TRRP guidance documents that
will facilitate appropriate PCL development. Some of the more basic
considerations are highlighted in the following text.Revised April 2013
TCEQ publication RG-366/TRRP-22
9
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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/m1/9/?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.