The Wise ReportHenry M. Wise, P.G.August 14, 2011Effective September 1, 2011, the Texas
Commission on Environmental Quality (TCEQ) Petroleum Storage Tank (PST) program
is revising the Action Levels and Plan A Target Concentrations for Leaking
Petroleum Storage Tank (LPST) releases. The new target concentrations reflect
the current toxicity parameters as revised by the toxicology staff of the TCEQ,
and the chemical/physical factors as posted by the Technical Support Section of
the Remediation Division. For additional information, please refer to the
equations used to derive the target concentrations as well as the toxicity
parameters and chemical/physical factors. All of this can be found at: http://www.tceq.texas.gov/remediation/pst_rp/news
The revised Plan A target concentrations apply
target risk goals as established in the PST rules (Chapter 334, Subchapter G,
Section 203.(1) (I) and (J)) and the methodologies developed in the regulatory
guidance, Risk-Based Corrective Action for Leaking Petroleum Storage Tank sites
(RG-36) and subsequent amendments in March 6, 1997 and August 12, 1997
Interoffice Memoranda. All methodologies, default values and exposure factors
used in the equations are supported by ASTM standards (E-1739-95) and United
States Environmental Protection Agency (US EPA).
Henry M. Wise, P.G.
The Wise Report
August 14, 2011