Detailed Site Investigation, Soil and Groundwater Remediation of Former Dry Cleaners
Overview
ARC completed a Preliminary Site Investigation (PSI) and Detailed Site Investigation (DSI) for a former dry-cleaning facility proposed for redevelopment into residential townhouses. The DSI was undertaken to support an Environmental Audit associated with the planning permit and comprised multiple phases of work, including a detailed soil sampling program, groundwater assessment and delineation, on- and off-site soil vapour investigations, and development of a comprehensive Conceptual Site Model (CSM).
Scope
Challenge
A Human Health vapour intrusion Risk Assessment (HHRA) identified potential unacceptable risks. A Remediation Action Plan (RAP) was subsequently prepared, incorporating a Remedial Options Assessment for impacted soil, soil vapour and groundwater.
Remediation works included the removal of underground infrastructure associated with the former dry-cleaning operations, comprising three Underground Storage Tanks (USTs), as well as various subsurface structures, pits, drainage lines and impacted soils. A Soil Vapour Extraction (SVE) system was in operation for 11 months.
Groundwater remediation has involved In-situ Chemical Reduction (ISCR) to facilitate reductive dechlorination of PCE to ethene.
The remediation is progressing towards Clean Up As Far As Reasonably Practicable (CUSFARP) in accordance with EPA requirements.
A Vapour Intrusion Mitigation System (VIMS) is being developed which is required to mitigate the remaining chlorinated hydrocarbon vapours to alow for the proposed residential redevelopment on the Site.
Site photography loads from the gallery field on each project. (Placeholder copy, not final.)