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USE OF MULTIPLE LINES OF EVIDENCE TO RESOLVE THE CSM FOR A COMPLEX GROUNDWATER TCE DISTRIBUTION
Lane, R. and M. Rasch. | CRC Care International Cleanup Conference, 8-12 September, Adelaide, Australia, 21 slides, 2019

The Tonsley Innovation District comprises a 61-ha area that was operated from 1964-2008 as a car manufacturing facility by Mitsubishi Motors Australia Ltd (MMAL) and lies within a broader industrial precinct that contains the former Reckitt & Colman (R&C) facility. Previous environmental investigation over 20 years identified a very complex dissolved-phase groundwater TCE distribution within the industrial precinct and surrounding areas, including ≤8 plumes of varying size and concentrations within the uppermost quaternary aquifer across the investigation area that extended into residential areas to the west and south. From 2017-2018, a wide range of investigation techniques were employed to provide lines of evidence to understand the complex plume architecture across the investigation area. Results indicated that TCE impacted wastewater originating from the former R&C site leaked from a historical private sewer, causing the large TCE plume present beneath the south-west corner of the MMAL site. The wastewater stream then flowed 300 m to the north-west in the public sewer to a second release point within the suburb of Mitchell Park beyond the low hydraulic conductivity zone in an area of much higher hydraulic conductivity, giving rise to the large off-site groundwater plume extending 1.5 km north-west of the MMAL site. http://adelaide2019.cleanupconference.com/wp-content/uploads/2019/09/M27e.pdf See investigation report for more information: https://renewalsa.sa.gov.au/wp-content/uploads/2018/08/Tonsley-VSCAP-Investigations-Further-Groundwater-Soil-Vapour-Investigations-November-2017-to-April-2018-report.pdf



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