THIS ARTICLE IS A CASE STUDY OF HISTORICAL PROJECTS HYDROSOLUTIONS HAVE WORKED ON.
COMMONWEALTH DEPARTMENT OF DEFENCE
Environmental Restoration Plan, Naval Communication Station Harold E Holt,
Northwest Cape, near Exmouth, Western Australia
Contamination had arisen at the Naval Communication Station due to historical waste disposal, chemical applications, industrial activities and chemical spillages since the base was commissioned in 1966. The base extends to four areas in excess of 15km2.
The main contaminated materials included:
-Mixed domestic and industrial wastes
-Discharges of bunker fuel & diesel
-Organo-chlorine herbicides/pesticides
-Polychlorinated biphenyls (PCBs)
-Garnet from maintenance operations
-Asbestos building wastes
-Metals leached from below ground
structures
The remedial scheme involved the removal by excavation of contaminated materials present above environmental guidelines followed by restoration with virgin fill. The contaminated soils were either to be bioremediated & replaced (for hydrocarbon impacted soils), or for more intractable materials for disposal
to a class IV (low-level) waste landfill, the first to be designed & commissioned in WA.
Numerical modelling was undertaken to assess the risk to groundwater, including the stygofauna, and to the marine environment from possible failure of the landfill liner.
Removal of contaminated material was validated. Each excavated area was to be re-instated with topsoil and re-seeded with native vegetation. An aftercare period of five years was specified.
An on-going groundwater monitoring program within the underlying karst limestone and superficial deposits was put in-place to verify that the intent of the remedial program was met.
Stuart Jeffries
Hydrosolutions Pty Ltd
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