1

DRAFT of July 10 , 2012 

### Siloxane Technical Working Group POTW Monitoring Tuesday, July 24, 2012
1 :00

- 3 :00 PM Eastern Time
Teleconference: ( 866 ) 299

- 3188; code : ( 202 ) 564

- 6738

Charg e : Build on the SEHSC proposal to d evelop a science

- based, rational proposal for
monitor ing of Publicly Owned Treatment Work s ( POTW ) sites which provides sufficient
information and data on the presence and concentrations of D4 and D5 in the environment and

on sources of and pathways to the environmental concentrations of D4 and D5 associated with POTWs, to support a national risk assessment for D4 and D5. Workgroup participants should be prepared to provide a scientific basis to address the following question s: 1. What factors (e.g., t reatment type, population (in surrounding area) ; low dilution (in receiving water) ; other considerations (geography, population , location of D4/D5 indirect discharge industrial facility , loading ) ) should be considered in developing a monitoring plan for POTW s to support a national risk assessment for D4 and D5 ?
2. Which monitoring parameters (e.g., D4 and D5 in WWTP influent; D4 and D5 in WWTP biosolids; D 4 and D5 in a ir emissions at WWTP ; D4 and D5 i n effluent at each WWTP’s outfall; D4 and D5 in surface water of receiving water body; D4 and D5 in surface sediment of receiving body water, biota monitoring , number of POTWs
to be monitored ) should be used to support a national risk assessment for D4 and D5 ?

Note

- b iota monitoring is outside the scope of this Technical Working Group meeting. Attached are references and background information pertaining to the technical issues to be discussed at this meeting.

Agenda:
1. Introduction, Goals, Charge

– Paul Lewis, EPA
2. SEHSC Proposal, including justification/rationale for monitoring at 5 sites

– Karluss Thomas, SEHSC (15 minutes)
3. Site Selection Factors (20 minutes)

SEHSC proposal Discussion by participants

Recommendations for site selection factors
4. Mon itoring Parameters (20 minutes)

SEHSC proposal Discussion by participants Recommendations for monitoring parameters
5. Development of Proposal (30 minutes)

6. Next Steps

7. Adjourn2

Discussion times are approximate. For further information, please contact Marc u s Aguilar at (202) 564

- 3194 or ag uilar.marcus@epa.gov

Participants of the technical working group will include technically knowledgeable representatives from EPA, SEHSC and member companies, and other interested parties including the National Association of Clean Water Agencies.3 

### Attachment Background and References for Siloxanes Technical Working Group Meeting

on POTW Monitoring

1. SEHSC January 31 st 2012 communication to the EPA from Karluss Thomas to Maria Doa

Attachment 1

– Description of Work Performed, Implications, On

- going Work
Attachment 2

– D4 and D5 Conceptual Site Models and Mass Balance Report
Attachment 3

– Table of SEHSC Member Company D4/D5 Manufacturing, Processing, and Formulating Facilities in
the U.S.

- 5 POTW sites and 4 SEHSC direct discharge sites in current proposal

2. Oregon study

Hope, B. K., Stone, D., Fuji, T., Gensemer, R. W. and Jenkins, J. (2010), Meeting the challenge of identifying persistent pollutants at the state level. Integr Environ Assess Manag, 6: 735

– 748.
doi : 10.1002/ieam.94

http://www.deq.state.or.us/WQ/SB737/docs/LegRpFinal20100601.pdf

Bruce K. Hope, Lori Pillsbury, Brian Boling, A state

- wide survey in Oregon (USA) of trace
metals and organic chemicals in municipal effluent, Science of The Total Environment, Volumes
417

– 418, 15 February 2012, Pages 263

- 272, ISSN 0048

- 9697, 10.1016/j.scitotenv.2011.12.028.

http://www.sciencedirect.com/science/article/pii/S0048969711014926

- 52 POTW sites in Oregon analyzed effluent for over 400 chemicals (D4 and D5 included)

3. Degao Wang et al.

, Concentrations of cyclic volatile methyl siloxanes (cVMS) in various
environmental media from Southern Ontario and Southern Quebec. Water Science and Technology Directorate Environment Canada. 2012 (accepted for publication)

- 13 POTW sites in Ontario (si tes remain anonymous) and 4 Industrial sites (Industrial information claimed as CBI)

4. Fate of Priority Pollutants in Publicly' Owned Treatment Works. United States Environmental Protection Agency. Effluent Guidelines Division. WH·552 Washington DC, 2046 0 EPA 440/1·82/303 September 1982. http:// nepis.epa.gov/Exe/ZyPURL.cgi?Dockey=000012HL.txt

- 40 POTWs and 10 industrial POTWs studied in the USA (siloxanes not included)

5. Targeted National Sewage Sludge Survey. U.S. Environmental Protection Agency Office of Water (4301T) 1200 Pennsylvania Avenue, NW Washington, DC 20460 EPA

- 822

- R

08

- 016. January 2009. http:/ /water.epa.gov/scitech/wastetech/biosolids/tnsss

- fs.cfm

- 74 POTWs sampled in the USA (siloxanes not included)4

6. Clean Watersheds Needs Survey http://water.epa.gov/scitech/datait/databases/cwns/index.cfm

7. Norden. 2005. Siloxanes in the Nordic Environment. TemaNord 2005:593. Copenhagen (NO),
Nordic Council of Ministers. Available from: http://www.norden.org/pub/miljo/miljo/uk/TN2005593.pdf