NDWAC Working
Group on Occurrence & Contaminant Selection Conference Call
July 17, 1997
Executive Summary
Washington, D.C.
1. Attendance: absent - Gary Toranzos, Adi Pour; alternate (for
Dave Paris) - Alan Roberson, all other Working Group Members in attendance.
2. Issues Discussed: The purpose of this call was to review and
discuss the results of using the criteria developed for the generation
of the draft Drinking Water Candidate List, and to develop recommendations
for consideration by the National Drinking Water Advisory Council.
3. Issues Resolved:
a. The input on microorganisms developed from the Microbiology
and Public Health Workshop has been accepted and it is recommended that
the microorganisms identified be included on the draft Candidate List.
b. The chemical contaminants identified using the criteria have
been accepted and it is recommended that they be included on the draft
Candidate List with the following modifications:
Defer phosphorous. It's suspected that data is mis-labeled as "phosphorus"
and is thought to be that of phosphate. Phosphorous is known to be insoluble.
Add a note to indicate that for sodium it's expected that guidance for
sensitive sub-populations will be developed.
Add a note to cyanazine to indicate it be addressed as total triazines
in combination with other currently regulated triazine pesticides.
Defer 31 pesticides (Table C) identified based solely on a calculated
Risk value of 2.0 or greater developed by the EPA Office of Pesticides
Programs. The risk value does not include a component which relates to
concentrations of concern to human health. A more comprehensive body of
work is underway and will provide a risk calculation which includes physical-chemical
properties, pesticide use as well as a human health related component.
This body of work will be available for future use.
Suspend the proposed tiering of the List. Present the List as a draft
and specifically state information needs. The idea of dividing the List
of contaminants into two groups based on information needs will be revisited
before the List is published in its final form in February 1998.
4. Next Steps: The draft List will be provided with recommendations
to the National Drinking Water Advisory Council at its meeting on May
21, 1997. The next meeting of the Working Group is tentatively planned
for early November 1997. At that time a summary of the comments on the
draft Candidate List and expected changes will be discussed. Other topics
on the agenda will include the development of a process for future contaminant
identification and selection, and the National Drinking Water Occurrence
Contaminant Database.
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