AIPG-TX

The TCEQ has updated the Texas Risk Reduction Program (TRRP) Tier 1 Protective Concentration Levels (PCLs).  You can access these tables at: https://www.tceq.texas.gov/remediation/trrp/trrppcls.html

The 2019 PCL table update is a single Microsoft Excel workbook with each table on a separate worksheet and 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 April 2018 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: https://www.tceq.texas.gov/assets/public/comm_exec/pubs/rg/rg-366-trrp-23.pdf

For additional information on the PCL tables, contact Mike Aplin at mike.aplin@tceq.texas.gov

– Henry M. Wise, P.G.