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Contaminated soil remediation Sunshine Coast

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The sandy coastal soils around Mooloolaba contrast sharply with the clay-rich profiles inland near Nambour, and both can carry legacy contamination from decades of agricultural or industrial use. We approach each site with a clear understanding of these local contrasts, combining field screening with targeted laboratory analysis. For residential subdivisions on former cane land, we often start with a muestreo inalterado to capture volatile compounds without disturbance, while for commercial redevelopments near the Maroochy River we rely on permeabilidad campo to map plume migration pathways. Every contaminated soil remediation project on the Sunshine Coast begins with a solid conceptual site model tailored to the local hydrogeology.

Illustrative image of Contaminated soil remediation in Sunshine Coast
Contaminated soil remediation on the Sunshine Coast demands site-specific hydrogeological models that account for seasonal water table fluctuations and residual agricultural chemicals.

Scope of work

A former petrol station site we assessed in Woombye showed total petroleum hydrocarbon concentrations exceeding the Health Investigation Level for commercial land use by a factor of four, requiring a combined excavation and vapour barrier strategy. The key variable in these jobs is the vertical distribution of contaminants, which we determine through staged borehole logging and granulometria to correlate fines content with sorption capacity. For sites close to Pumicestone Passage, where the water table sits less than 1.5 m below surface, we complement the investigation with densidad cono arena to verify compaction of backfill after soil removal. Remediation targets are always set against the NEPM health and ecological screening levels, and we document every step for regulatory sign-off by the Department of Environment and Science.
Technical reference image — Sunshine Coast

Area-specific notes

AS 1726:2017 requires that any site investigation for contaminated soil remediation identifies potential off-site migration pathways, yet many Sunshine Coast properties sit on sandy aquifers that transmit leachate quickly toward Bribie Island wetlands. The risk is compounded when historical fill contains asbestos fragments or when acid sulfate soils are disturbed during excavation. We apply the NEPM site-specific risk assessment framework to set practical clean-up goals, and we always include a groundwater monitoring component when the contamination extends below the seasonal water table. Overlooking these pathways can lead to enforcement action under the Environmental Protection Act 1994.

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Technical data


ParameterTypical value
Contaminant suite analysedTPH, BTEX, PAHs, heavy metals, OCPs
Sampling density (residential)1 borehole per 400 m²
Laboratory turnaround time5-10 business days urgent
Validation criteriaNEPM 2013 HSLs and ESLs
Remediation depth capacityUp to 6 m with excavation
Field screening equipmentPID, XRF, immunoassay kits

Linked services

01

Site investigation and risk assessment

Detailed intrusive investigation including borehole drilling, soil sampling, groundwater monitoring well installation, and laboratory analysis to characterise contamination extent and calculate site-specific health and ecological risk.

02

Remediation design and validation

Engineering design of excavation, soil vapour extraction, bioremediation, or stabilisation strategies, followed by validation sampling to demonstrate compliance with clean-up criteria before site closure.

03

Asbestos and acid sulfate soil management

Specialised handling of asbestos in fill materials and management of acid sulfate soils during excavation, including neutralisation, classification, and disposal documentation for council and DES approval.

Standards used

NEPM 2013 (National Environment Protection Measure), AS 1726:2017 Geotechnical Site Investigations, Queensland Environmental Protection Act 1994, AS 4482.1:2005 Guide to the investigation and sampling of potentially contaminated soil

Frequently asked questions

How much does contaminated soil remediation cost on the Sunshine Coast?

Total project costs typically range from AU$5.540 to AU$20.160 depending on the contaminant type, volume of soil requiring treatment, and disposal fees. A simple residential excavation with validation can sit at the lower end, while a commercial site with groundwater monitoring and bioremediation reaches the upper range.

What contaminants are most common in Sunshine Coast soils?

TPH and BTEX from former service stations are frequent, as are heavy metals from historical orchards and market gardens. Asbestos in demolition fill and acid sulfate soils in low-lying coastal areas near the Maroochy River are also recurring issues.

How long does the remediation process take from investigation to sign-off?

A straightforward residential site with excavation and validation can take 6-8 weeks. More complex sites involving groundwater remediation or bioremediation may require 12-20 weeks including regulatory review by the Department of Environment and Science.

Location and service area

We serve projects across Sunshine Coast.

Location and service area