ECOLOGY RULES PAGE
MTCA Rule Revision and MTCA/SMS Integration
MTCA/SMS Advisory Group -
February 22 Meeting Cancelled
The preliminary topics for the March 22, 2010, meeting
- Roadmap status update on the rule revision topics that have been
discussed in the workgroup to date and upcoming topics.
- Options for revising MTCA Method A Soil and Groundwater cleanup
levels based on:
- Use of New Toxicity Information to Update Cleanup Levels:
EPA has published updated toxicological parameters for many
chemicals since the 2001 rule amendments. For some chemicals,
the updated toxicity information results in changes to the Method A
cleanup levels. Prior to the March 22 meeting, we will be
sending you materials that summarize the new toxicity values,
illustrate how that information impacts cleanup levels, and discuss
some of the policy and implementation issues associated with
potential rule revisions.
- EPA Early Life Stage Guidance: EPA updated their
cancer guidelines in 2005. One part of the EPA guidance deals
with cancer risks posed by exposures that occur during early
childhood. Other states are using the EPA guidance when
establishing cleanup levels. We are now considering whether
and how to apply the EPA guidance to sites in Washington.
Prior to the March 22 meeting, we will send you materials describing
EPA’s guidance and information related to the scientific, policy and
implementation issues associated with this topic.
- Cleanup Levels for Lead: There has been a considerable
amount of new scientific information on lead toxicity developed
since the 2001 rule amendments. We are evaluating this
information to determine whether revisions to the MTCA cleanup
levels are needed. Prior to the March 22 meeting, we will be sending
you materials that summarize recent scientific and regulatory
developments on lead and information related to rule options and
- Concurrent Pathway Exposures: We are looking at ways to
simplify the cleanup rule. One option is to combine the
Standard Method B and Modified Method B into a single Method B. If
we did this, we would need to decide which soil cleanup equation to
use for the direct contact pathway. Prior to the March 22
meeting, we will be sending you materials on the rulemaking options.
- Implementation issues associated with revisions to the MTCA
Prior to the March 22 meeting, we will send an email to committee
members with an agenda and meeting materials. These materials
will also be posted to the Ecology website at this link:
If you have questions on this note or the rulemaking process,
please call Dave Bradley (360-407-6907) or Martha Hankins (360-407-6864).
Martha is currently out of the office and will return on February