TRRP Protective Concentration Levels
The TRRP Tier 1 protective concentration levels (PCLs) are the default cleanup standards in the Texas Risk Reduction Program.
March 2017 PCL and Supporting Tables
Human Health and Aquatic Life Surface Water RBELs
- human health surface water RBELs table (October 2015) and aquatic life surface water benchmark table, updated January 2017
Note that the surface water benchmark table is one of several tabs in an excel file that presents the ecological benchmarks. The surface water benchmark table is equivalent to, and replaces, the aquatic life surface water RBELs table.
Use these spreadsheets to assist in the calculation of TPH PCLs. The spreadsheet was updated in December 2016.
Tier 2 PCL Equations
A person has the option of using Tier 2 PCLs. These PCLs are calculated using site-specific inputs in the Tier 2 equations.
Older PCL Tables
Download these files if you still need previous versions of the Tier 1 PCL tables (see the help file on self-extracting zipped files).
- March 2016 tables Tier 1 and Supporting tables | Print only version
- December 2015 tables
- November 2014 tables
- September 2014 tables
- June 2012 tables
- May 2011 tables
- March 2010 tables
- March 2009 tables
- March 2008 tables
- May 2007 tables
- March 2006 tables
- March 2005 tables
- March 2004 tables
- March 2003 tables
Refer to this November 21, 2002 memo for information on implementing the revised arsenic MCL.
See this document for COCs for which Calculation of a Human Health PCL is not Required (revised March 30, 2007).
If your COC is not listed in the Tier 1 PCL table, you may obtain COC chemical and physical properties information by following the procedure on the How to Request Tier 1 PCLs, Chemical/Physical Properties, and Toxicity Values for COCs page.
As part of the TRRP rule, the agency developed state-wide background concentrations for metals. You may use these values in place of site-specific background concentrations. The Texas Specific Median Background concentrations are found in the TRRP rule at §350.51(m), and are available here for your convenience.
Refer to this guidance on Chromium.
Use of Software Programs for TRRP
Read this information on using software for TRRP.