Risk Reduction Rule
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The Risk Reduction Rule, Title 30, Texas Administrative Code Chapter 335, Subchapter S, sets forth the requirements for the three risk reduction standards for persons undertaking a closure or remediation in accordance with §335.8. Please note that there is now limited opportunity to use these rules. The newer rule is called the Texas Risk Reduction Program (TRRP). For further information, see §350.2(m) of the Texas Risk Reduction Program.
Acceptability of using a statistically-derived background value as a cleanup standard when it exceeds a human health-based criteria under the 1993 Risk Reduction Rule. Refer to the information in this memo when using background as a cleanup level.
Cleanup standards for the Risk Reduction Rule are included in the following spreadsheets, last updated in March 2006. These tables will not be updated. If a toxicity factor for your COC has changed, use the tox factors to calculate the new cleanup standard.
- MSC and risk-based screening levels tables and the
- toxicity and chemical/physical properties tables.
The determination of human health MSCs are not necessary for several essential elements. For more information, refer to these memos on Evaluation of the Potential Health Impacts of Exposure to Iron, Calcium, Magnesium, Potassium, Sodium, and Phosphorus through Soil Ingestion and COCs for which Calculation of a Human Health MSC is not Required.