The Wise Report

Henry M. Wise, P.G.

September 13, 2014


The TCEQ updates to the Texas Risk Reduction Program (TRRP) Tier 1 Protective Concentration Levels (PCLs) are now available at:  You


The 2014 PCL table update is a single Microsoft Excel workbook with each table on a separate worksheet.  The updates are also available as a print only Adobe Acrobat portable document format (PDF) file.  The Excel file and the PDF file each contain PCL tables 1 through 10 and the supporting tables in the following order:


  •          Summary of Updates
  •          Table 1 – Tier 1 Residential Soil PCLs
  •          Table 2 – Tier 1 Commercial/Industrial Soil PCLs
  •          Table 3 – Tier 1 Groundwater PCLs, Residential and Commercial/Industrial
  •          Table 4 – Tier 1 Residential Total Soil Combined PCLs
  •          Table 5 – Tier 1 Commercial/Industrial Total Soil Combined PCLs
  •          Table 6 – Tier 1 Individual Residential Soil PCLs
  •          Table 7 – Tier 1 Individual Commercial/Industrial Soil PCLs
  •          Table 8 – Tier 1 Individual Residential and Commercial/Industrial Groundwater PCLs
  •          Table 9 – Individual Risk-Based Exposure Limits (RBELs), Residential
  •          Table 10 – Individual Risk-Based Exposure Limits (RBELs), Commercial/Industrial
  •          Toxicity Factors
  •          Chemical/Physical Properties
  •          Organic Carbon-Water Partition Coefficient (Koc) Values for Ionizing Organic COCs as a Function of pH
  •          Gastrointestinal and Dermal Absorption Fractions (ABSGI and ABD.d Values)
  •          2011 List of Updates


The PCL tables updated in June 2012 were the most recent tables prior to this release.  A guide to the correct interpretation and use of the Tier 1 PCL tables can be accessed at:


For additional information on the PCL tables, contact Jessica Mauricio at



Henry M. Wise, P.G.

The Wise Report


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