DWA Task Group on Extraction Water Chemistries

DWA Task Group on Extraction Water Chemistries

MeetingDecember 2, 2009

NSF International (Ann Arbor, MI)

Meeting Summary

Roll call

-it was communicated that Mike Richards and Richard Sykes have withdrawn from the TG

Antitrust statement

The antitrust statementwas read and all agreed to abide by it.

Review of task group charge

It was confirmed that the TG charge was to evaluate exposure waters chemistries across the standard.

Scope of tasks and potential work product(s)

1)It was decided that an overview paper, essentially an extraction waters chemistries primer, would be developed collaboratively. It was agreed that this document would cover:

• Historical perspective
• List of test waters and their use as listed in the table provided but with the addition of a column outlining why the waters are used and/or what it addresses
• Limitation on waters exposed to in-field use
• Hot water –document why they are not used
• Address softened water
• Assumptions on water used –surface/groundwater and private/public sources

2)Pete to provide a summary document of extraction waters being prepared for a Water Research Foundation project to adapt as necessary for the task group.

3)The development of a database with data reflecting trends in results against changes in the standard or materials. For example, trends for NSF Section 9 products with decreasing lead content or meeting the new Q value over the years.

4)Develop a section on the task group website which has FAQ’s and questions to address and issues to consider. Currently, the issues under consideration are:

− Cu Pipe and pH 6.5 exposure water

− pH 5 & 10 .vs. “regent water” for process media

− Waters used on copper alloys

− Chlorine concentration for test waters –is 2 mg/L sufficient? Should it be 4 mg/L

5)France to solicit information on and provide a summary of projects either completed or currently under way that are addressing some of the issues of interest to the TG. These include:

• Water RF project 3107 on disinfection change (Boyd et al)
• Water RF project 3018 on lead and copper failures (Sandvig et al)
• Water RF project 3112 on low lead materials (Sandvig et al?)
• Water RF project 31xx on water quality impacts on low lead brass by TZW (in progress)
• Water RF project xxxx on impacts from chloramines/chlorine on leaching of fittings by Cadmus/NSF (in progress)

Note: France to contact Traci Case to see if she can provide published reports to TG members who don’t have access to WaterRF reports.