best%practice%approaches% to%contamination
TRANSCRIPT
BEST PRACTICE APPROACHES TO CONTAMINATION INVESTIGATION AND REMEDIATION IN AUSTRALIA
2nd China Sustainable Environmental Remediation Conference
Ian Brookman
09 June 2018
PRESENTATION OUTLINE
1. Ventia history and experience
2. Remediation in Australia
3. The remediation process
4. Key challenges
Ventia - Remediation ServicesIndustry Leading position
Unrivalled track record
§ Australasia’s oldest and most experienced remediation contractor
§ Successfully completed over 145 of Australasia’s largest and most complex environmental projects over last 30 years including: – The Hunter River Remediation Project ($405M)– Union Carbide and Allied Feeds sites including
Homebush Bay ($140M)– Barangaroo Gasworks Project – Sydney ($125M –Current)
– Cheoy Lee Shipyards – Hong Kong ($65M)– Botany Carpark Waste Encapsulation Project
($63M)
REMEDIATION IN AUSTRALIA
AUSTRALIAN REMEDIATION MARKET DRIVERS
The current Australian environmental services market is largely driven by • Land redevelopment• Regulatory compliance • Major infrastructure projects
Community pressures help drive demand for quality remediation
Emerging contaminants such as Per- and Polyfluoroalkyl Substances (PFAS) are causing national problem for Commonwealth agencies.
LARGE REMEDIATION PROJECTS IN AUSTRALIA (AUD $20M+ / ¥100,000,000+)
Project Type Reason Value ($M AUD) Value ¥ CNY
Hunter River Remediation Project (sediment) Industrial FacilityRegulatory Compliance and Resource infrastructure 405 1,967,363,946
Barangaroo (in progress) Gasworks Urban Renewal 121 587,780,339Former Union Carbide Site, (Lednez) Rhodes Chem Facility Urban Renewal 81 393,476,344Cheoy Lee Shipyards - Penny's Bay Remediation, Hong Kong Industrial Facility Disneyland HK 65 315,752,622West Melbourne Gasworks Gasworks Urban Renewal 63 306,031,360Orica Carpark Waste Encapsulation Chem Facility Regulatory Compliance 63 306,031,360Dandenong Waste Treatment Plant Landfill & Hazwaste Regulatory Compliance 50 242,882,031AGL Mortlake Gasworks Gasworks Urban Renewal 47 228,309,110Allied Feeds Site, Rhodes Chem Facility Urban Renewal 47 228,309,110
Varsity Lakes Creek Station Landfill & HazwasteRegulatory Compliance & Transport Infrastructure 44 213,736,188
Newstead RiverPark Gasworks Urban Renewal 38 184,590,344
Cape Lambert Landfill Relocation Landfill & hazwasteRegulatory Compliance and Resource infrastructure 31 150,586,859
RANAD Newington, Silverwater Landfill & hazwaste Urban Renewal (Sydney Olympics) 27 131,156,297Macdonaldtown Gasworks Remediation Gasworks Regulatory Compliance 27 131,156,297
Cox Peninsula Remediation Project (Stages 1&2) Industrial Facility Regulatory Compliance 27 131,156,297Point Cook FTA Defence Regulatory Compliance 27 131,156,297HMAS Platypus Gasworks Regulatory Compliance 24 116,583,375Homebush Bay Dioxin Remediation Chem Facility Regulatory Compliance 22 106,869,576
BASICS OF THE ASSEMENT AND REMEDIATION PROCESS
SITE ASSESSMENT AND REPORTING
• Generally undertaken by Environmental consultants
• Normally a minimum of two stages, desk top and sampling if site history indicates the potential for contamination.
• A good assessment will include • Site history• Future use • Geology and hydrogeology• Contamination (type, concentration and distribution)
• Applicable standards/criteria• Preliminary quantities• Adequate sampling upfront saves time and money in the long run.
REMEDIATION DESIGN
• Generally completed by an Environmental consultant• Early contractor involvement reduces the risk of rework• The future land use needs to be agreed prior to
moving forward with the remediation design • Various approaches should be considered • Approvals should be obtained after the remediation
design is completed • Approvals should be outcome based• A good remediation design will consider the potential
impact of the works and include mitigating measures.
Remediation Technologies and solutions
REMEDIATION TECHNOLOGIES & SOLUTIONS
• Containment • Biological • Chemical / physical
• Immobilisation• Chemical oxidation
• Thermal
• Insitu and Exsitu
CONTAINMENT / ENCAPSULATION • Appropriate for both Inorganics and
organics• Onsite encapsulation utilising Clay and
synthetic liners, drainage layers, capping.• landfilling off site at a licenced facility• Regulatory limits determine if treatment is
requirement• Does not destroy contaminants and can
limit the future land use if done onsite.
BIOREMEDIATION
• From landfarming through to engineered cell• Simple organics to moderately complex organics – TPHs, PAHs• Sensitive to contaminant concentration and complexity• Duration and cost variable
IMMOBILISATION
• Physical or chemical treatment• Organics and inorganics• Immobilises, does not destroy
THERMAL
• Organics • Insitu or exsitu, batch or continuous• Direct or Indirect • Destroys or condense and collect
SUMMARY REMEDIATION APPROACHES
• Various strategies should be considered
• Generally the “do nothing” approach is considered the cheapest, however be aware of “consultant creep”
• “Dig and Dump” is quick but can be costly
• “Contain” can be more cost effective but could limit future development
• Treatment is generally costly but deals with the “legacy of contamination”
• “Bio” is inexpensive but can be unreliable
CHALLENGES IN REMEDIATION
ENVIRONMENTAL (ODOUR / VOLATILES CONTROL)
• One of the biggest issues with community and stakeholder is odour
• Odour control enclosures are common on projects in Australia
• Buildings are often constructed from a series of steel trusses covered in a weather proof fabric envelope
• Negative pressure
EMISSIONS CONTROL SYSTEM
• Removes contaminated air from within Environmental Control Enclosures (and replaces with clean air from the outside)
• Treats contaminated air through particulate and activated carbon filters
ENVIRONMENTAL MONITORING (REAL TIME)
GEOTECHNICAL • Often overlooked • Material properties key in treatment selection
• Could decrease or increase volumes significantly
OCCUPATIONAL HEALTH & HYGIENE
• Appropriate exposure limits established
• Medical assessments for workers
• Comprehensive inductions• Real-time Monitoring for chemicals of concern
• Biological monitoring
COMMUNITY ENGAGEMENT
Remediation project examples
THERMAL DESORPTION OF HEXACHLOROBUTADIENE, NSW
http://www.orica.com/Locations/Australia--Pacific-and-Indonesia/Australia/Botany-Remediation-Projects/Projects/Completed-Projects/Car-Park-Waste/remediation-works#.Whwu4VVsZ0w
LANDFILL RELOCATION –VARSITY LAKES, QLD.
Excavation, screening and relocation of 1,000,000m3 of domestic and hazardous waste
THERMAL DESORPTION OF DIOXINS – RHODES PENINSULA, NSW.
$160m dioxin clean-up of former Union Carbide/ Allied Feeds sites and Homebush BayProject involved dredging and thermal treatment of bay sedimentsExtensive pollution control measures
REMEDIATION OF PENNY’S BAY (FORMER CHEOY LEE SHIPYARDS) HONG KONG
Thermal treatment of 75,000t of dioxin-contaminated soilstabilisation of 130,000t of heavy metal wastebioremediation of 16,000t of hydrocarbon waste
CONCLUSION
• Improper or limited site characterization is the cause of great uncertainty and generally leads to claims.
• The future use of the site needs to be agreed prior to developing the remediation strategy
• Approvals should be outcome based • Allocate risk appropriately • Early contractor involvement is critical• Adequate environmental controls can save you money and time in long run
CONTAMINATED LAND INDUSTRY CONFERENCE
• Sydney, Australia. October 02-05 2018
• http://landandgroundwater.com/conference/2018-ecoforum-conference-exhibition
