The Wise Report - Decmber 20, 2015

The Wise Report

Henry M. Wise, P.G.

December 20, 2015


The TCEQ has announced updates to the Texas Risk Reduction Program (TRRP) Tier 1 Protective Concentration Levels (PCLs) are now available.  You can access these tables at:


The 2015 PCL table update is a single Microsoft Excel workbook with each table on a separate worksheet.  The updates are availabl 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 November 2014 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 the following link:


For additional information on the PCL tables, contact Mike Aplin at


Henry M. Wise, P.G.

The Wise Report


Henry M. Wise, PG
Sunday, December 20, 2015
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