SUMMARY OF THE REMEDIATION TECHNOLOGIES DEVELOPMENT FORUM
PHYTOREMEDIATION ACTION TEAM
CHLORINATED SOLVENTS SUBGROUP CONFERENCE CALL
1:00 p.m.-2:00 p.m.
September 25, 2002
On Wednesday, September 25, 2002, the following members of the Remediation Technologies Development Forum's (RTDF's) Chlorinated Solvents Subgroup met in a conference call:
Joel Burken, University of Missouri-Rolla
Harry Compton, U.S. Environmental Protection Agency (EPA)
Linda Fiedler, EPA
Xiujin Qiu, The Dow Chemical Company
Also participating in the call was Christine Hartnett from Eastern Research Group, Inc. (ERG).
OVERVIEW OF THE SUBGROUP'S PLANS
The Subgroup has been working on a protocol that describes how to assess phytoremediation at chlorinated solvent sites. Once completed, this protocol will be tested in the field at actual sites.
Developing the Protocol
Call participants could not comment on the status of the protocol because Bob Tossell--the person revising the protocol--did not take part in the conference call. Joel Burken said that he is working with Tossell on the protocol's section on sampling techniques. The protocol's current text, said Burken, indicates that site managers are expected to sample for metabolites (e.g., trichloroacetic acid, or TCAA). Burken suggested changing the wording to make it clear that such sampling is optional: while it is advisable to sample for metabolites at sites where regulatory concern has specifically been expressed, it is not necessary to perform such sampling at every site. The protocol should state, Burken said, that controlled studies have been performed to assess the toxicity of metabolites and that the results suggest that contaminant breakdown products, such as TCAA, pose little toxicological concern. Burken said that he has forwarded references to Tossell backing up this claim.
Call participants expressed strong interest in finalizing the protocol and distributing it for outside review. They suggested taking the following steps to achieve this goal:
Identifying Demonstration Sites
Fiedler said that Subgroup members originally hoped to complete the protocol before contacting site managers about demonstration projects. During this call, however, call participants decided that site identification activities should not be postponed any longer. Subgroup members recommended identifying potential sites and initiating contact with site managers. They acknowledged that the process of selecting sites raises the following questions: