1. Using water quality and infauna data to understand the environmental impacts of wastewater discharge Peter Crockett and Scott Chidgey

2. A tale of two outfalls Altona STP Murray Goulburn Co-op

3. Distance (≈ Exposure -1 ) Response Dose-Response

4. Water Quality

5. Infauna

6. Altona Outfall Total phosphorus concentrations as proportion of background median Median background 2.5 X background 5 X background 10 X background 20 X background >20 X background June 2006 Background median TP: 0.14 mg/L April 2008 Background median TP: 0.09 mg/L March 2010 Background median TP: 0.10 mg/L March 2011 Background median TP: 0.18 mg/L

7. Altona Outfall Abundance by infauna family, 2004-2015 Capitellidae Galeommatidae

8. Altona Outfall Infauna abundance, 2004-2015

9. Altona Outfall Abundance of Capitellidae, 2004-2015

10. October 2010 Background median TP: 0.010 mg/L August 2012 Background median TP: 0.017 mg/L December 2013 Background median TP: 0.010 mg/L March 2015 Background median TP: 0.012 mg/L Venus Bay Outfall Total phosphorus concentrations as proportion of background median 2 X background 5 X background 10 X background Median background 1.5 X background >10 X background

11. Venus Bay Outfall Abundance by infauna family, 2004-2015 Trochidae (Bankivia sp.) Cirolanidae

12. Venus Bay Outfall Infauna abundance, 2004-2015

13. Venus Bay Outfall Infauna abundance, 2004-2015

14. Venus Bay Outfall Infauna abundance, 2010-2015

15. Venus Bay Outfall Ophiuroid abundance, 2010-2015

16. Thanks to City West Water South Gippsland Water Murray Goulburn Co-operative Infauna Data (Lynda Avery)