Groundwater Prohibition Area – Portions of Hendon, Royal Park, Seaton and Albert Park
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Environment Protection Authority Groundwater Prohibition Area – Portions of Hendon, Royal Park, Seaton and Albert Park Determination Report EPA Ref: 61557, 05/22785 South Australia Groundwater Prohibition Area – Portions of Hendon, Royal Park, Seaton and Albert Park Determination Report EPA Ref: 61557, 05/22785 Author: Gabrielle Wigley For further information please contact: Information Officer Environment Protection Authority GPO Box 2607 Adelaide SA 5001 Telephone: (08) 8204 2004 Facsimile: (08) 8124 4670 Free call (country): 1800 623 445 Website: https://www.epa.sa.gov.au Email: [email protected] ISBN 978-1-921495-94-6 August 2019 © Environment Protection Authority This document may be reproduced in whole or part for the purpose of study or training, subject to the inclusion of an acknowledgment of the source and to it not being used for commercial purposes or sale. Reproduction for purposes other than those given above requires the prior written permission of the Environment Protection Authority. Contents Abbreviations ...................................................................................................................................................................... 1 Summary .............................................................................................................................................................................. 3 1 Introduction ................................................................................................................................................................... 5 1.1 Background.......................................................................................................................................................... 5 1.2 Legislative framework .......................................................................................................................................... 5 1.3 Extent of groundwater contamination .................................................................................................................. 6 1.4 Role of SA Health ................................................................................................................................................ 6 1.5 Role of site contamination consultant and site contamination auditor ................................................................. 6 2 Site contamination – EPA information sources ......................................................................................................... 9 2.1 Documentation review and information in the EPA Public Register .................................................................... 9 2.2 Site contamination in the Hendon, Royal Park, Seaton and Albert Park area ..................................................... 9 3 EPA consideration for a GPA .................................................................................................................................... 11 3.1 Conceptual site model ....................................................................................................................................... 11 3.2 Site history and surrounding land uses.............................................................................................................. 11 3.3 Summary of regional and local hydrogeology.................................................................................................... 13 3.4 Characterisation of the nature and extent of soil and groundwater contamination ............................................ 18 3.5 Groundwater users ............................................................................................................................................ 52 3.6 Factors considered in the determination of the groundwater prohibition area ................................................... 52 3.7 Exposure pathways and human health risk assessment ................................................................................... 53 4 GPA consideration ...................................................................................................................................................... 54 5 Community information ............................................................................................................................................. 55 5.1 Community engagement.................................................................................................................................... 55 5.2 Access to EPA information ................................................................................................................................ 55 6 Conclusion .................................................................................................................................................................. 56 7 Glossary ....................................................................................................................................................................... 57 Appendix 1 Summary of penalties and fees .............................................................................................................. 59 Appendix 2 Source site details .................................................................................................................................... 60 Appendix 3 Details of reports available in the EPA Public Register ....................................................................... 61 Appendix 4 Chlorinated hydrocarbons ...................................................................................................................... 70 Appendix 5 South Australian geology and hydrogeology ........................................................................................ 72 List of figures Figure 1 Map of proposed groundwater prohibition area .................................................................................................. 7 Figure 2 Map of information held by the EPA ................................................................................................................... 8 Figure 3 Satellite photo of the suburbs of Hendon, Royal Park, Seaton and Albert Park within the proposed GPA ...... 10 Figure 4 Geological and hydrogeological cross-section ................................................................................................. 14 Figure 5 General flow of groundwater from the Mt Lofty Ranges across the Adelaide Plains ........................................ 14 Figure 6 Groundwater contour and sewer plan .............................................................................................................. 17 Figure 7 Groundwater flow direction and deep sewer main location .............................................................................. 17 Figure 8 Hendon industrial area ..................................................................................................................................... 19 Figure 9 Groundwater TCE results in March 2017 ......................................................................................................... 20 Figure 10 Groundwater PCE results in March 2017 ......................................................................................................... 21 Figure 11 Schematic map of source site with depiction of lateral extent of hydrocarbon plume ....... Error! Bookmark not defined. Figure 12 Inferred TCE plumes and known sources ........................................................................................................ 22 Figure 13 Inferred PCE plumes and currently known sources ......................................................................................... 23 Figure 14 Simulated PCE plume as of 2017 ..................................................................................................................... 24 Figure 15 Simulated PCE plume in 800 years .................................................................................................................. 25 Figure 16 Location of service station, Seaton ................................................................................................................... 26 Figure 17 Soil and groundwater bore locations at the service station, Seaton ................................................................. 27 Figure 18 Former market garden, Seaton ........................................................................................................................ 28 Figure 19 Soil and groundwater sampling locations at the former market garden, Seaton .............................................. 29 Figure 20 Vehicle storage and maintenance site, Royal Park .......................................................................................... 30 Figure 21 Groundwater flow contours across the vehicle storage and maintenance site, Seaton ................................... 30 Figure 22 Former commercial building, Royal Park .......................................................................................................... 31 Figure 23 Soil and groundwater investigations of the former commercial building, Royal Park ....................................... 32 Figure 24 Former service station, Royal Park .................................................................................................................. 33 Figure 25 On and off-site groundwater investigation wells at service station, Royal Park ............................................... 34 Figure 27