What's !! 

New Environmental Regulations That Affect the Way You Do Business

Risk Management Plans (RMPs)

See the special section "RMP Toolbox" for the latest information and documents on RMPs!



Three-Tiered Approach:


Additional Information

Lawrence Livermore National Laboratory (LLNL) Recommendation for LUST Cleanup

A recently published report by the Lawrence Livermore National Laboratory (LLNL) recommends passive bioremediation "wherever possible," and an immediate modification of the Risk-Based Cleanup Action (RCBA) to support a tier-one decision making process.

Oversight agencies (i.e., Regional Water Quality Control Boards)  have endorsed the report, and are calling for aggressive implementation. Utilizing measures specified will allow agencies to close low-risk, soil-only, petroleum contaminated, leaking underground storage tank (LUST) sites. For low-risk groundwater sites (shallow groundwater with maximum depth to water less than 50 feet and no drinking water wells screened in the shallow groundwater zone within 250 feet of the leak), remediation should be replaced with monitoring.

Read memos below for specifics:

ASTM's Risk-Based Corrective Action ("Rebecca")

Developed by the American Society of Testing and Materials (ASTM), the Risk-Based Corrective Action (RBCA; "Rebecca") Standard (38-94) is designed to simplify the human health risk assessment process. It was recently endorsed by the EPA, and Block Environmental Services has utilized its approach at several Bay Area sites.

This approach breaks the site investigation into Tier 1, 2, and 3 levels. Tier 1 is the least contaminated and Tier 3 the most contaminated. Tier 1 is based on comparing chemical concentrations to "evergreen" risk-based cleanup levels such as the EPA Region IX Preliminary Remediation Goals (PRG's) or the values (BTEX only) provided in the guidance. Note that RBCA levels are much less stringent than EPA levels which would ultimately reduce cleanup costs. For example, the residential soil cleanup standard for benzene in the ASTM guidance is 1.05 mg/kg compared with 5 mg/kg specified by the EPA-a five-fold reduction for benzene! For more information about this important document and its applications call (800) 682-7255.

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