1. Groundwater Watch List GWWL «Draft Concept Report»
35th CIS Groundwater Working Group (WG GW) Plenary Meeting in Vienna (AT)
Groundwater Watch List GWWL «Draft Concept Report»
Rüdiger Wolter – expert
Ronald Kozel – Switzerland
and group of volunteers:
Tim Besien – UK; Matthijs Bonte – CONCAWE; Jacqueline Claessens – Netherlands; Johannes Grath – Austria; Francis Delloye – Belgium; Ralph Eppinger – Belgium; Emanuele Ferretti – Italy; Falk Hilliges – Germany; Volker Laabs – ECPA; Dan Lapworth – UK; Dennis Lemke – CEFIC; Benjamin Lopez – France ; Dieter Schaefer – ECPA; Elisa Vargas Amelin - EU Commission; Rob Ward - UK
Vienna (AT), October 2018

2. Already done: To do – next steps:
35th CIS Groundwater Working Group (WG GW) Plenary Meeting in Vienna (AT)
Already done:
Watch list process launched by WG GW (Brussels) April 2015ü
Meeting group of volunteers (Berne)  1st draft 8./ ü
Presentation at SCG and Approval 9./ ü
1st pilot study on Pharmaceuticals and report 2016ü
Meeting group of volunteers (Vienna) 23./ ü
2nd pilot study on PFAS ü
Meeting group of volunteers (Paris) ü
Meeting group of volunteers (Paris) August 2018ü
Finalisation of GWWL Concept & Methodology October 2018ü
To do – next steps:
Approval of GWWL Concept & Methodology end of 2018
Launch of the GWWL process 2019
Supporting EC review of Annexes I and II of GWD
Report on PFAS pilot study 2018/19

3. Concept & Methodology Paper
35th CIS Groundwater Working Group (WG GW) Plenary Meeting in Vienna (AT)
Concept & Methodology Paper
New or (significantly) revised since CIS meeting in Berne ( ) based on discussion at Paris ( ) meeting and review of the Group of Volunteers:
“Structure of the Groundwater Watch List (GWWL) process” (fig. 3.1)
Results of Column I and Column II assessments are merged to a “Combined groundwater leaching potential score” (ranked List III)
Ranked List III is combined with the “hazard potential” of substances to a “Integrated groundwater score” (ranked List IV)
“Timeline of the GWWL process” (fig. 3.2) modified
Chapter 5 skipped resp. partly integrated in text and annexes
Text revised
Berne: version 10.8 – Paris: version 10.9 – Review: version 11.3 – WG GW: version 12.0

4. New Groundwater Watch List process (concept)
35th CIS Groundwater Working Group (WG GW) Plenary Meeting in Vienna (AT)
New Groundwater Watch List process (concept)
New: Scoring and combination of scores

5. All substances, except Annex I and II substances of GWD
Prioritisation of substances based on existing monitoring data (column I)
Criteria: presence in GW
Prioritisation of substances based on substance properties
(column II)
Criteria: mobility and persistence and – if available – environmental emission, use-pattern and pathway
Proved groundwater leaching potential score (ranked List I)
Theoretical groundwater leaching potential score (ranked List II)
((Score N°PC) + (Score %° sites)) / 2
(annex 1.1)
(Persistence score + Mobility score) / 2
(annex 1.2)
Substance
Proved groundwater leaching potential score
PFOA 1
PFOS
PFBPA ?
Theoretical groundwater leaching potential score
0,8
0,65
Combined groundwater leaching potential score (ranked List III)
Substance
Combined groundwater leaching potential score
PFOA
0,9
PFOS
0,825
PFBPA
0,8 (to be flagged)
(Proved groundwater leaching score + Theoretical groundwater leaching score) / 2
(annex 1.3)

6. 35th CIS Groundwater Working Group (WG GW) Plenary Meeting in Vienna (AT)
Determination of hazard
Criteria: toxicological or ecotoxicological hazard
Combined groundwater leaching potential score (ranked List III)
Substance
Combined groundwater leaching potential score
PFOA
0,9
PFOS
0,825
PFBPA
0,8
Sulfamethoxazole
0,95
Toxicological or eco- toxicological hazard score 1 ?
0,38
Integrated groundwater score
(ranked List IV)
See Annex 1.5
(Combined groundwater leaching potential score + Toxicological or ecotoxicological hazard score) / 2
Substance
Integrated groundwater score
PFOA
0,95
PFOS
0,9125
PFBPA
0,8 (to be fiagged)
Sulfamethoxazole
0,66

7. 35th CIS Groundwater Working Group (WG GW) Plenary Meeting in Vienna (AT)
Integrated groundwater score
(ranked List IV)
GWWL
Monitoring
Sufficient monitoring data available? NO
YES
Selection of limited number (e.g. top 30)
Relevant findings ?
YES NO
Groundwater Watch List
GWWL
List facilitating the Annex I and II process of GWD
Deselection List (no relevant findings)
Criteria for integration in “List Facilitating Annex I/II process of GWD”:
Quantified in 4 or more MS and
found at more than 10 sites in each of the countries

8. Detected but not quantified*
35th CIS Groundwater Working Group (WG GW) Plenary Meeting in Vienna (AT)
Substances that could go to the “List facilitating Annex I/II process”
No of MS/AC
Substance Name
Acronym
Total number of sites
Detected but not quantified*
No of findings
MS/AC with findings
List Facilitating* 10
Perfluorooctanoic Acid
PFOA
5736 38
1549
Perfluorooctane Sulfonate
PFOS
6278 55
1430 9
Perfluorohexanoic Acid
PFHxA
4662
1175 8
Perfluorohexane Sulfonate
PFHxS
2328
124
873 7
Perfluoroheptanoic Acid
PFHpA
4224 37
817
Perfluoropentanoic Acid
PFPeA
2452 19
701 6
Perfluorobutane Sulfonate
PFBS
2209 93
577 5
Perfluorobutanoic Acid
PFBA
1189
552 4
Perfluorononanoic Acid
PFNA
3752 2
195
Perfluorodecanoic Acid
PFDA
2945 1
173 3
Perfluoroheptane Sulfonate
PFHpS
787 77
Perfluorododecanoic Acid
PFDoA
2830 62
Perfluoroundecanoic Acid
PFUnA
2711 42
1H, 1H, 2H, 2H-Perfluorooctanesulfonic Acid
H4-PFOS (6:2 FTS)
518 0  31
1H, 1H, 2H, 2H-Perfluorodecanesulfonic Acid
H4-PFDeS (8:2 FTS)
242  0 24
Perfluorooctane Sulfonamide
PFOSA
1715 22
10 PFAS were found in 4 or more MS/AC at 10 or more sites
 „List facilitating Annex I/II process“

9. All substances, except Annex I and II substances of GWD
Prioritisation of substances based on existing monitoring data (column I)
Criteria: presence in GW
Prioritisation of substances based on substance properties
(column II)
Criteria: mobility and persistence and – if available – environmental emission, use-pattern and pathway
Determination of hazard
Criteria: toxicological or ecotoxicological hazard
Proved groundwater leaching potential score (ranked List I)
Theoretical groundwater leaching potential score (ranked List II)
Combined groundwater leaching potential score (ranked List III)
Integrated groundwater score
(ranked List IV)
GWWL
Monitoring
Sufficient monitoring data available? NO
YES
Selection of limited number (e.g. top 30)
Relevant findings ?
YES NO
Groundwater Watch List
GWWL
List facilitating the Annex I and II process of GWD
Deselection List (no relevant findings)

10. 35th CIS Groundwater Working Group (WG GW) Plenary Meeting in Vienna (AT)
New Timeline of the Groundwater Watch List GWWL process (fig. 3.2)

11. 35th CIS Groundwater Working Group (WG GW) Plenary Meeting in Vienna (AT)
First ideas for next data collection (substances or group of substances):
Plasticizers
Surfactants (different subgroups used for pesticides, health care products, ...)
Non-relevant metabolites (large dataset available from D, B, CH).
Microplastics
Artificial Sweeteners
1,4-dioxine
Biocides (includes pharmaceuticals, pesticides, surfactants)
EDTA
PAH (Polycyclic Aromatic Hydrocarbons)
Veterinary medicines
Solvents (e.g. 1,4-dioxine)
Perchlorate (ClO−4.)
Existing lists
SIN (Substitute It Now) list: ( The list comprises around 1000 compounds with substances which have to be banned, based on REACH
Indicators for bombs (TNT, dinitrofenol)
Surface Water Watch List
Shortlist Drinking Water Group
PMT list (Persistent Mobile Toxic)

12. Lead and support of GWWL process
35th CIS Groundwater Working Group (WG GW) Plenary Meeting in Vienna (AT)
Next steps:
Set up of first GWWL (based on results of pharmaceuticals and PFAS pilot studies)
Lead and support of GWWL process
Identification of substances for the List Facilitating Annex I/II process (based on results of pharmaceuticals and PFAS pilot studies)
Next data collection
Report on PFAS pilot study
Presentations of progress at WG GW meetings

13. Thank you for your attention !
35th CIS Groundwater Working Group (WG GW) Plenary Meeting in Vienna (AT)
Thank you for your attention !