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Managing SoilsA Consultants Perspective

Presented by Roger Parker

Golder Associates Pty Ltd

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Overview

Soil Remediation in Victoria Soil Remediation Options Treatment and management methods

HWCC Contaminated soil outcomes Buffers Design of a Soil Treatment Facility What would it treat ? What would it look like ? Where should it be ?

Concluding Remarks

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Soil Remediation in Victoria

BP Pt Melbourne First major cleanup Technology soil washing first use of soil

treatment technology in Victoria

Ardeer Battery recycling

Commencement of Auditing of ContaminatedLand

Audit System Independent sign-off for land suitability Unique (?) system now being copied

elsewhere in Australia and internationally

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Soil Remediation In Victoria

Common forms of remediation in Victoria (andAustralia):

Manage contamination on site: Under buildings In secure areas (on-site containment) Excavate and remove to landfill Land farming (hydrocarbons) really only

suitable for low volatility contaminants Some stabilisation Dilution ? Others ?

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Future Management of Contaminated Soil in Victoria

Publication 878 classifies soilcontaminated with TPH, MAH,OCcompounds and PAH as waste forwhich reuse, recycling, recovery ofenergy and treatment opportunities willbe available in the near future

When facilities available EPA willmodify landfill licences to preventdisposal of these materials

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Common Methods of Treating Soil

In situ Soil vapour extraction Soil stabilisationBioremediation Ex situ Bioremediation Thermal desorption Washing (water or chemical) Stabilisation followed by reuse or disposal Treatment may not render soil clean. May

only lower concentration enabling managedreuse or disposal

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Leachatecollectiondrain

Leachate re-circulation

and irrigation

Vacuumpump

Slotted pipe forair extraction

HDPE liner

AirTreatment

Moisturepot Soil mixture

Emission

stack

Leachate holding tank

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Hazardous Waste Consultative Committee

Late 1990s the HWCC was formed to look atissues associated with generation andmanagement of hazardous waste in Victoria

Final report in April 2000 Some recommendations related to management

and treatment of contaminated soil

Recommendations largely accepted byGovernment

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Hazardous Waste Consultative Committee

That, where practicable, category A and B soils be treated toreduce their level of hazard to, at least, Category C level sothey can be legitimately reused on-site, or in some otherapproved offsite use (including as cover in appropriatelyengineered landfills). In the cases of those Category A soils,characterised by metal or persistent organic contaminantswhich cannot be readily or safely treated, the EPA may

determine that there is no practical alternative but stabilisationand encapsulation prior to containment.

Comment Category A, B, C yet to be defined

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Hazardous Waste Consultative Committee

That the Government encourage and facilitate theestablishment of appropriately sized, designed and located

soil remediation facilities(which may operate as soil banks) to maximiseopportunities for diversion of contaminated soil intolegitimate forms of reuse or storage.

Comment: Practicality of soil banks may be an issue.Who wants soil that with a contamination pedigree?

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Design of a Soil Treatment Facility

What should it treat? Depends on sites being developed (mostremediation driven by redevelopment) Nature of contamiantion and type of soil willvary Common contaminants: TPH and BTEX PAH Metals Melbourne (and surrounds) soils generally

clayey Extent of treatment Depends on soil and waste Cost Regulation ability to reuse or availability of

disposal options

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Bioremediation

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Soil Stabilisation

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Thermal Desorption Plant

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Design of a Soil Treatment Facility

What should it look like? Fenced site Gatehouse and waste receipt Office, workshop and laboratory (?) Building and paved area for waste receipt,storage and sorting Systems for sorting (eg screening) Stormwater and waste water systems Power supply Area for bioremediation Stabilisation plant or area Thermal treatment plant? (depends on

market)

Other ? (depends on market and proprietarysystems available) Most important land available for treatment tosuit the contaminated soil that needs treatment

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Design of a Soil Treatment Facility

Possible layout design

StockpileArea

StockpileArea

Bio-treatment

Area

TechnologyTreatment

Area

TechnologyTreatment

Area

WastewaterStorageBasin

(to treatment

system)

FutureWastewater

StorageBasin

Emission StackControl Area

0m 50m 100m

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Design of a Soil Treatment Facility

Where should it be? Somewhere near the source of

waste (not far from MetropolitanMelbourne)

An old landfill would be anappropriate site 200 m buffer is sensible

Generally industrial surroundingthe buffer

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Concluding Remarks

Currently less high levelcontaminated soil being generated Greater interest in treatment

Treatment site needed whereremediation on site is not practicable orwhere time is an issue Still expect on site treatment and onsite management to be preferredoptions We need a site with a licence withflexibility to meet market demand

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