SOURCE CONTROL BEFORE RESTORATION
Offsets, Remediation and Bioremediation Are Different Tools
— and They Must Be Used in the Right Order
Across Canada, governments, industries and community organizations spend millions of dollars restoring fish habitat, rebuilding shorelines, creating wetlands and compensating for habitat lost to development.
Much of that work is necessary and worthwhile.
But there is a basic problem in the way some projects are planned and described:
A habitat offset, a remediation project and a bioremediation project are not the same thing.
They can happen at the same location. They can support one another. A remediated industrial shoreline can eventually become excellent fish habitat. A constructed wetland can treat polluted runoff while also providing habitat.
But each tool begins with a different purpose:
An offset compensates for unavoidable new environmental damage.
Remediation corrects or manages an existing environmental problem.
Bioremediation uses living systems to help treat that problem.
Restoration rebuilds ecological function.
The trouble begins when these separate jobs are bundled together and the whole package is called an offset.
That can result in work already required to clean up an environmental problem being counted as compensation for new damage somewhere else. It can also result in habitat being created where pollution, excessive stormwater, sewage, unstable sediment or other environmental pressures continue to undermine it.
The issue is not whether we should restore habitat.
We should.
The issue is whether we are putting environmental work in the proper order:
avoid new damage, control the existing problem, remediate what requires remediation, use bioremediation where it works, restore ecological function, and offset only the remaining unavoidable harm with benefits that are genuinely additional.
That is the subject of this article.
What Is a Habitat Offset?
A habitat offset is supposed to compensate for residual damage to fish or fish habitat caused by another project.
Under Canada's federal fish-habitat framework, the sequence is meant to be:
Avoid. Mitigate. Offset.
Avoid the damage where reasonably possible.
Reduce or mitigate the harm that cannot be avoided.
Only then should the remaining unavoidable damage be offset.[1][2]
This matters because offsetting should not become a convenient way of approving unnecessary habitat destruction.
A valid offset must produce enough ecological benefit to counterbalance the residual loss. It must consider where the habitat is located, what ecological functions are being lost, how long replacement habitat will take to mature, whether it will last, and whether there is a real chance it could fail.[2][3]
DFO's policy also contains an especially important requirement:
Additionality
An offset must create environmental benefits over and above what was already going to happen or what was already legally required.[3]
That means an activity does not automatically become an offset simply because it benefits fish.
Repairing an environmental problem that an owner or operator was already legally required to repair is normally compliance or remediation.
The offset value should come from an additional ecological improvement beyond that existing obligation.
What Is Remediation?
Remediation begins with a different question:
What is already wrong with this site, and what must be done to correct or manage it?
The problem may involve:
contaminated soil or sediment;
contaminated groundwater;
sewage entering a watercourse;
industrial pollution;
excessive nutrients;
unstable or contaminated fill;
an eroding shoreline;
contaminated stormwater;
an old pollution source that continues releasing material.
Remediation can involve removing contaminated material, containing it, capping it, treating it, controlling its source, managing the remaining risk and monitoring whether the remedy continues to work.
British Columbia already has a legal framework for this under the Environmental Management Act and Contaminated Sites Regulation.[4][5]
That framework applies not only to land. It can also apply to groundwater, surface water and aquatic sediment.
This distinction is crucial:
Remediation deals with an existing environmental impairment.
An offset compensates for new residual harm associated with another project.
A remediated site may eventually become an excellent offset location. But the remediation and the offset must be identified separately.
What Is Bioremediation?
Bioremediation is one way of carrying out remediation or pollution treatment.
It uses biological processes to remove, break down, capture or immobilize pollutants.
Examples include:
microorganisms breaking down petroleum hydrocarbons;
plants taking up nutrients;
constructed wetlands treating stormwater;
vegetated swales capturing suspended solids;
biochar supporting contaminant treatment;
floating treatment wetlands;
fungi or bacteria helping degrade organic pollutants;
marsh vegetation slowing and filtering runoff.
Bioremediation can produce valuable habitat at the same time.
A treatment wetland may improve water quality and provide refuge for fish and wildlife. A vegetated stormwater system may trap pollutants while creating a riparian corridor.
That is a good result.
But the two functions still need to be understood separately.
If the main purpose is to treat polluted runoff, it is first a treatment or remediation system.
If it also creates measurable, lasting habitat beyond what was already required, that extra ecological benefit may potentially contribute to an offset.
The environmental accounting must explain the difference.
Where the Confusion Begins
Imagine an urban shoreline receiving stormwater from roads, parking lots, older sewer infrastructure and commercial or industrial properties.
The shoreline is degraded.
A wetland or marsh is then created at the receiving end.
That new wetland may:
treat runoff;
trap sediment;
remove nutrients;
stabilize the shoreline;
improve fish habitat;
provide bird habitat;
be claimed as an offset for habitat damage caused somewhere else.
There is nothing wrong with one project producing several benefits.
The problem is failing to establish which benefit belongs in which category.
What portion of the project is required remediation?
What portion is bioremediation or pollution treatment?
What portion restores an existing damaged site?
And what portion is genuinely additional ecological benefit that can fairly be counted as an offset?
Without that separation, the same environmental work can effectively be counted more than once.
A required cleanup may be presented as compensation.
A pollution-treatment facility may be presented mainly as fish habitat.
A highly degraded site may be assigned substantial habitat credit before anyone has shown that it can support healthy habitat over the long term.
Why Source Control Matters
Source control means dealing with the cause of the environmental problem.
If sewage is entering a creek through a cross-connected pipe, repair the pipe.
If industrial pollutants are entering a storm drain, find and control the source.
If road runoff is damaging salmon habitat, capture or treat the runoff.
If excessive stormwater flows are eroding a restored stream, reduce or slow the runoff throughout the watershed.
If contaminated groundwater is reaching the shoreline, investigate and manage the groundwater pathway.
If excessive nutrients are causing algae blooms, reduce the nutrient loading.
If contaminated sediment is being carried into a wetland, determine where it is coming from.
Source control does not mean every pollutant must disappear before any restoration work can begin.
That would be unrealistic in a large city.
It means the significant continuing pressures must be understood and controlled enough to give the remediation or restoration a reasonable chance of succeeding.
This idea is sometimes called source-control sufficiency.
The question is not whether the site is perfect.
The question is whether the remaining pollution and environmental pressures are controlled sufficiently to protect the work being done.
Contamination Is One Part of the Story
Chemical contamination is important, but it is not the whole issue.
Habitat projects can also fail because of:
excessive storm flows;
low summer flows;
erosion;
sediment loading;
sewage contamination;
high nutrient levels;
poor dissolved oxygen;
elevated water temperature;
barriers to fish movement;
repeated physical disturbance;
altered tides or water levels;
continuing shoreline development.
A creek can be rebuilt physically and still receive unhealthy water.
A wetland can be planted and then repeatedly buried by sediment.
A marsh can be created where high storm flows tear it apart.
A fish-habitat offset cannot provide lasting compensation if the environmental process that damaged the original habitat remains active.
Source control therefore supports remediation, bioremediation, restoration and offsetting.
It protects the investment.
Known and Unknown Contamination Must Be Handled Properly
Some sites are already known to be contaminated.
Others have histories that suggest possible contamination but have never been adequately investigated.
That is common in old industrial harbours.
A shoreline may contain historic fill.
Groundwater may carry contaminants toward the water.
Stormwater may deposit new contaminants.
Sediment may contain pollution from industries that closed decades ago.
And older investigations may not have tested for contaminants that are now recognized as important.
British Columbia law makes an important point:
The absence of a formal contaminated-site determination does not prove that a site is clean.[4]
That does not mean every old shoreline should automatically be labelled contaminated.
It means the site should be investigated when its history, surrounding land use, sediment conditions or known pollution pathways give reasonable cause for concern.
British Columbia already has procedures for preliminary and detailed site investigations.[4][5]
The proper sequence is straightforward:
A known contaminated site should first be treated as a remediation site.
A site with reasonable evidence of possible contamination should be investigated.
Once its condition is understood, regulators can decide whether it is also suitable for restoration or offsetting.
Europe: Prevent, Repair and Compensate — in That Order
Europe is not free from polluted rivers, contaminated harbours or failed restoration projects.
But European environmental law generally makes a clearer distinction between preventing harm, repairing damage and compensating for unavoidable residual effects.
Under the EU Habitats Directive, compensation associated with protected Natura 2000 sites comes near the end of the decision-making process.
Authorities must first consider alternatives and mitigation. A damaging project can proceed under the exceptional compensation route only under defined conditions, including the absence of better alternatives and the presence of overriding public-interest reasons.[6]
The basic order is:
avoid the damage;
reduce what cannot be avoided;
repair the affected environment;
compensate for what genuinely remains.
That is close to Canada's stated avoid–mitigate–offset hierarchy.
The Polluter-Pays Principle
The EU Environmental Liability Directive adds another important idea:
The polluter should pay for preventing and remedying environmental damage.[7]
The directive deals with damage to water, land, protected species and natural habitats.
Its remedial system distinguishes between restoring the damaged resource itself and providing additional or compensatory measures when full recovery cannot be achieved immediately.
The important point is that compensation does not erase the original remediation obligation.
If a waterbody is polluted, the duty to address that pollution remains.
Creating habitat somewhere else does not automatically replace the need to repair the original damage.
Europe Treats the Waterbody as a System
The EU Water Framework Directive works at the river-basin level.
It seeks to prevent deterioration and move rivers, lakes, estuaries, groundwater and coastal waters toward good ecological and chemical condition.[8]
That means considering:
water chemistry;
aquatic life;
hydrology;
physical habitat;
point-source pollution;
diffuse pollution;
watershed land use.
The Marine Strategy Framework Directive applies similar thinking to marine ecosystems, while the EU Nature Restoration Regulation adds legally defined restoration obligations.[8]
The system is not perfect, and many European waters still fail to meet their objectives.
But the policy direction is clear:
Restoration is supposed to improve the functioning environmental system, not merely create a new habitat feature.
Eastern Canada: Remedial Action Plans for the Great Lakes
Eastern Canada provides some of the clearest examples of the difference between building habitat and repairing an ecosystem.
Under the Canada–United States Great Lakes Water Quality Agreement, severely degraded locations were identified as Areas of Concern.[9]
These areas suffered from combinations of:
industrial pollution;
contaminated sediment;
sewage;
excessive nutrients;
beach closures;
restrictions on fish consumption;
altered shorelines;
degraded fish and wildlife populations;
lost wetlands and fish habitat.
Governments developed Remedial Action Plans for these locations.
The plans do not begin by asking where an offset can be built.
They begin by asking:
What environmental uses have been lost?
What caused the loss?
What pollution or physical damage must be corrected?
Who is responsible for the work?
What evidence will show that the waterbody has recovered?
These lost environmental functions are called Beneficial Use Impairments.
Habitat restoration may help remove some of them.
Sediment remediation, wastewater treatment and pollution control may be required to remove others.
The waterbody is not declared recovered merely because a construction project has been completed.
Hamilton Harbour: Different Problems, Different Tools
Hamilton Harbour is a useful Canadian example because it contains nearly every environmental problem found in a large urban industrial harbour.
It has faced industrial pollution, municipal wastewater, urban runoff, contaminated sediment, altered shorelines, lost wetlands and degraded fish habitat.
The response has therefore used several different tools.
Wastewater-treatment upgrades are pollution-control measures.
Randle Reef is primarily a contaminated-sediment remediation project.
Wetland and shoreline projects are habitat restoration.
Other work improves fish and wildlife populations.
All of these measures contribute to harbour recovery, but they are not treated as though they are the same thing.
Approximately 615,000 cubic metres of heavily PAH-contaminated sediment at Randle Reef required engineered containment, dredging, capping and long-term monitoring.[10]
That work is remediation.
Habitat recovery occurs alongside it.
Nobody pretends that planting habitat elsewhere makes the contaminated sediment disappear.
The Eastern United States: Measure the Environmental Result
The American Great Lakes program uses the same Areas of Concern and Beneficial Use Impairment framework.[9]
Success is measured by whether the environmental impairment has actually been removed.
A fish-habitat project may help improve fish populations.
A sediment cleanup may be needed to improve benthic organisms.
Wastewater improvements may be required to end beach closures.
Nutrient reductions may be needed to address algae.
The work is judged against the condition of the ecosystem, not only the amount of construction completed.
The Chesapeake Bay: Pollution Reduction and Restoration Together
The Chesapeake Bay uses another model.
There, habitat restoration is linked to measurable watershed pollution reduction.
Governments establish loading targets for nitrogen, phosphorus and sediment.
Jurisdictions prepare Watershed Implementation Plans explaining how those reductions will be achieved.
Wastewater, agriculture, urban stormwater and other sources all form part of the program.[11]
At the same time, governments and organizations restore:
wetlands;
oyster reefs;
submerged aquatic vegetation;
streams;
riparian corridors.
Habitat restoration is not expected to replace pollution control.
The two proceed together.
The basic approach is:
measure the environmental pressure;
reduce it at its source;
restore the ecosystem;
measure whether conditions improve.
The West Coast: The Lower Duwamish Model
The Lower Duwamish Waterway in Seattle may be the most useful West Coast comparison.
It is an old industrial urban waterway containing contaminated sediment, industrial properties, stormwater discharges, sewer infrastructure, transportation corridors and continuing urban activity.
Washington divided the surrounding drainage area into 24 source-control areas.[12]
Within each area, regulators examine:
contaminated properties;
industrial sources;
stormwater;
sewers and overflows;
groundwater;
sediment movement;
pathways that could recontaminate the river.
They then ask whether enough source control has occurred to allow major in-water sediment remediation to proceed.
Source-Control Sufficiency
Washington Ecology uses the concept of source-control sufficiency.
Before large sums are spent cleaning contaminated sediment, regulators want reasonable confidence that continuing sources will not simply contaminate the cleaned area again.[12]
That does not require perfection.
Washington openly recognizes that some background urban contamination will continue.
The test is whether remaining sources have been identified and controlled sufficiently to protect the remedy.
In 2023, Washington reviewed 29 active cleanup locations in the Upper Reach of the Lower Duwamish.
Cleanup was considered ready to proceed at 28 locations.
One was not considered ready because the source-control work remained insufficient.[12]
That ability to say “not here, not yet” is an important environmental safeguard.
What Puget Sound's Completed Cleanups Tell Us
A 2024 review examined five major Puget Sound sediment-cleanup projects.
It found that where effective source controls produced contaminant-load reductions of more than about 80 percent, surface sediment conditions and biological recovery indicators improved quickly.
The reported average recovery half-time was approximately 1.6 years — meaning that, under those conditions, the measured difference between contaminated and recovering conditions was reduced by about half over that period.[13]
The authors concluded that effective source control had, in some circumstances, produced greater risk reduction than broad-scale sediment remediation.
That does not mean sediment cleanup is unnecessary.
It means stopping the continuing pollution can sometimes produce the largest environmental gain.
California Also Separates Cleanup and Habitat Work
San Francisco Bay faces the same broad mixture of contaminated land, stormwater, industrial activity, dredging and habitat loss.
California regulates contaminated soil, groundwater and sediment through cleanup programs.
Stormwater operates under water-quality regulatory programs.
Wetland restoration occurs through separate habitat programs.
Suitable dredged material may be reused to rebuild marsh habitat, but suitability has to be evaluated.[14]
The programs overlap, but one does not erase the responsibilities of another.
A cleanup remains a cleanup.
A treatment system remains a treatment system.
Additional habitat may then be counted separately.
British Columbia Has Most of the Required Tools
British Columbia is not short of environmental law or technical knowledge.
It has:
the Environmental Management Act;
the Contaminated Sites Regulation;
sediment and water-quality standards;
site-investigation procedures;
remediation requirements;
municipal stormwater programs;
federal Fisheries Act protections;
DFO fish-habitat and offsetting policies;
regional environmental monitoring.
The federal Fisheries Act also separates fish-habitat impacts from pollution.
Sections dealing with harmful impacts to fish and fish habitat are distinct from section 36, which prohibits unauthorized deposits of deleterious substances into water frequented by fish.[1]
That means building a habitat offset does not automatically resolve or authorize a continuing pollution problem.
These are separate legal and environmental questions.
The Problem Is Integration
The weakness is not necessarily the absence of individual laws or programs.
The weakness is that they are often administered separately.
One program investigates contaminated land.
Another monitors stormwater.
Another owns the storm sewer.
Another reviews fish-habitat impacts.
Another approves an offset.
Another funds restoration.
Another monitors water quality.
Each individual decision may appear reasonable.
But the fish live in the combined result.
The important question is therefore not merely:
Did each agency complete its part?
It is:
Does the entire environmental system make sense together?
Existing Cleanup Should Not Be Counted Twice
DFO's additionality rule is critical here.
Suppose a shoreline is contaminated and remediation is already required.
Cleaning up that contamination may create major benefits for fish.
But the required cleanup itself should not automatically be counted as an offset for new habitat damage elsewhere.[3]
The cleanup is remediation or compliance.
Once the site has been remediated, additional work might then:
create a larger marsh;
restore eelgrass;
reconnect tidal habitat;
build fish refuge;
improve ecological productivity beyond the cleanup requirement.
That additional improvement may have legitimate offset value.
The distinction prevents double counting.
It prevents an owner or proponent from receiving environmental credit merely for correcting a problem they were already required to correct.
Victoria Harbour and the Gorge
Victoria Harbour, Rock Bay, Selkirk Waters, the Gorge Waterway and Portage Inlet should be among Canada's leading urban-waterway restoration areas.
These waters still support salmon, forage fish, eelgrass, migratory birds and a remarkable range of marine life.
People live, swim, paddle and work beside them.
Governments, First Nations, community organizations and volunteers have spent decades trying to improve them.
There has been real progress.
But these waterways also contain a mixture of historic and continuing environmental pressures:
industrial history;
contaminated sediment;
urban stormwater;
older sewer infrastructure;
shoreline alteration;
transportation corridors;
contaminated fill;
lost habitat;
continuing development.
The challenge is not simply to build more habitat.
It is to ensure that remediation, bioremediation, restoration and offsetting are being used for the correct purposes.
What the CRD Monitoring Shows
The Capital Regional District's 2024 Core Area Stormwater Quality Program assessed a system containing approximately 550 stormwater discharges.
In 2024, CRD sampled 195 discharges twice for E. coli.
Forty percent produced at least one count above 400 colony-forming units per 100 millilitres.
Twenty-eight discharges received a high public-health concern rating.
Seventeen had remained high-rated for at least five years.[15]
The chemical program continued to identify discharges recommended for corrective action.
As of 2024, sixteen discharges remained on that list, and several had been concerns for more than ten years.[15]
These results do not mean every restoration or offset project in the Harbour and Gorge is inappropriate.
They do show that the receiving environment continues to face significant pressures that must be considered in site selection, design, offset calculations and long-term monitoring.
Monitoring Is Not Source Control
This distinction is central.
Sampling a discharge is monitoring.
Finding where the pollution comes from is investigation.
Listing a discharge for corrective action is administration and prioritization.
Stopping or reducing the discharge is source control.
Returning afterward to prove that the improvement lasts is verification.
All five steps matter.
Monitoring alone does not protect a habitat investment.
A thermometer measures a fever. It does not cure it.
Fragmented Responsibility
CRD monitors and investigates many stormwater problems.
Municipalities own and operate much of the stormwater infrastructure.
The Province regulates contaminated sites.
DFO administers federal fish and fish-habitat provisions.
Different agencies, landowners and project proponents may fund, construct or maintain restoration and offset projects.
This creates a fragmented system.
In the material reviewed for this article, we did not find a single Harbour-and-Gorge framework comparable to:
the Great Lakes Remedial Action Plan system;
the Chesapeake pollution-load framework;
the Lower Duwamish source-control sufficiency process.
That does not mean no useful work is occurring.
It means the work is not visibly tied together through one waterbody-wide environmental recovery plan with common endpoints.
Where British Columbia Has Fallen Behind
British Columbia's long-term failure is not that it never restores habitat.
Many worthwhile habitat projects have been completed.
It is not that every offset is ineffective.
Some offsets produce substantial benefits.
It is not that the Province lacks contaminated-site expertise or that regulators know nothing about source control.
The weakness is the order of operations.
Too often, remediation, stormwater management, habitat restoration and offsetting appear as separate projects rather than connected stages of ecological recovery.
Other jurisdictions increasingly ask:
What must be corrected before this work can succeed?
British Columbia too often begins with:
Where can the habitat project be built?
The difference is subtle, but important.
One starts with the environmental problem.
The other starts with the available project.
A Better Test for Habitat Offsets
Before a significant habitat offset is approved in a degraded urban waterway, the following questions should be answered.
1. What damage is being offset?
The lost habitat and ecological functions should be clearly described.
2. Why could that damage not be avoided?
Offsetting should remain the last step, not the first choice.
3. What mitigation occurred?
The proponent should show how the project reduced its effects before calculating the residual loss.
4. What is the condition of the proposed offset site?
Existing habitat, contamination, hydrology, water quality, sediment, surrounding land use and continuing environmental pressures should be understood.
5. What work is already legally required?
Required remediation, pollution control and site stabilization must be separated from additional offset benefits.
6. Is bioremediation part of the project?
When a wetland or biological system is treating pollution, its treatment role should be described and measured.
7. Are significant continuing sources sufficiently controlled?
The site does not need to be pristine, but the remaining pressures should not make failure or recontamination reasonably foreseeable.
8. What benefit is genuinely additional?
Only the ecological improvement beyond existing obligations should be counted as offset value.
9. How long must the benefit last?
A short-lived habitat feature cannot fairly replace habitat that would otherwise have functioned for generations.
10. How will success be proved?
Monitoring should examine ecological function, not merely construction completion.
That can include:
fish use;
plant survival;
habitat stability;
water quality;
sediment quality;
contaminant accumulation;
benthic organisms;
long-term maintenance needs.
Bioremediation Can Be Part of a Better System
Bioremediation should play a much larger role in degraded urban waterways.
Constructed wetlands, vegetated swales, floating treatment wetlands, biochar systems and similar tools may allow us to treat pollution while also creating habitat.
But they must be assessed honestly.
What enters the treatment system?
What leaves?
What contaminants are removed?
Where do they accumulate?
Does plant material need to be harvested?
Does sediment need to be removed?
Are pollutants being transferred into insects, shellfish or other organisms?
Is fish exposure actually reduced?
These are treatment and remediation questions.
Once those questions are answered, the project may also demonstrate valuable ecological functions.
That additional habitat benefit should be measured separately.
Source Control Does Not Mean Waiting for Perfection
None of this should become an excuse for doing nothing.
Some sites require immediate action.
An eroding contaminated shoreline may need to be stabilized.
A sediment hotspot may need to be capped before every upstream source has been eliminated.
A failing stream may need emergency work while watershed improvements continue.
A treatment wetland may need to be installed because it is one of the available source-control measures.
The standard should not be:
Do nothing until the entire watershed is clean.
The standard should be:
Understand the environmental problem, control the significant continuing sources, separate required remediation from additional habitat benefit, and design the project around the real condition of the site.
The Objective Should Be a Restored Waterway
Victoria Harbour and the Gorge do not simply need more individual environmental projects.
They need a connected strategy that identifies:
what requires conventional remediation;
where bioremediation can treat continuing pollution;
where habitat restoration can proceed now;
where source control must improve first;
where site conditions remain insufficiently understood;
where genuine additional habitat offsets can be created;
how long-term success will be measured.
The goal should not be the number of projects completed.
The goal should be a healthier waterway.
The Bottom Line
Offsets, remediation and bioremediation are all useful environmental tools.
But they do different jobs.
Remediation addresses existing environmental damage.
Bioremediation uses living systems to help treat that damage or pollution.
Restoration rebuilds ecological function.
Offsetting compensates for unavoidable residual new damage.
Source control protects all of those investments from being undone.
The order matters.
Repairing an old environmental problem should not automatically be counted as compensation for new damage.
A pollution-treatment wetland should be measured as a treatment system as well as habitat.
A restoration project should be judged by whether ecological functions recover and persist.
An offset should include only the additional environmental benefit that can genuinely be demonstrated.
British Columbia already has many of the laws, policies and technical tools needed to do this properly.
What is missing is a consistent system connecting them.
For Victoria Harbour and the Gorge, that discussion is overdue.
Source Control Before Restoration
Avoid what can be avoided.
Mitigate what cannot.
Remediate existing environmental damage.
Use bioremediation where it provides real treatment.
Restore ecological function.
Offset only the genuinely additional benefit.
Then monitor long enough to prove that it worked.
Numbered References
1. Government of Canada. Fisheries Act, R.S.C. 1985, c. F-14, particularly sections 34.1, 34.4, 35 and 36. Section 36(3) contains the federal prohibition against unauthorized deposits of deleterious substances into waters frequented by fish.
2. Fisheries and Oceans Canada. Fish and Fish Habitat Protection Policy Statement. Establishes the hierarchy of avoiding impacts, mitigating unavoidable impacts and offsetting residual effects.
3. Fisheries and Oceans Canada. Policy for Applying Measures to Offset Harmful Impacts to Fish and Fish Habitat and accompanying offsetting-plan guidance. Addresses ecological equivalence, uncertainty, time lags, durability, additionality, site selection and monitoring.
4. Province of British Columbia. Environmental Management Act, S.B.C. 2003, c. 53, Part 4 — Contaminated Site Remediation. Establishes investigation, determination, responsibility and remediation powers. The Act also recognizes that absence of a formal determination does not itself establish that a site is uncontaminated.
5. Province of British Columbia. Contaminated Sites Regulation, B.C. Reg. 375/96. Establishes numerical and risk-based standards for soil, groundwater, water, vapour and sediment, including sediment standards and sensitive aquatic uses.
6. European Union. Council Directive 92/43/EEC, the Habitats Directive, particularly Article 6 and associated European Commission guidance on mitigation and compensatory measures affecting Natura 2000 sites.
7. European Union. Directive 2004/35/EC, the Environmental Liability Directive. Establishes the polluter-pays framework for preventing and remedying environmental damage to water, land, protected species and natural habitats.
8. European Union. Directive 2000/60/EC, the Water Framework Directive; Directive 2008/56/EC, the Marine Strategy Framework Directive; and Regulation (EU) 2024/1991, the Nature Restoration Regulation.
9. Canada–United States Great Lakes Water Quality Agreement. Areas of Concern and Remedial Action Plan framework, including Beneficial Use Impairments and evidence-based criteria for environmental recovery.
10. Canada Water Agency and Hamilton Harbour Remedial Action Plan. Hamilton Harbour Area of Concern and Randle Reef Contaminated Sediment Remediation Project. Approximately 615,000 cubic metres of contaminated sediment are addressed through engineered containment, dredging, capping and monitoring.
11. United States Environmental Protection Agency. Chesapeake Bay Total Maximum Daily Load and state Watershed Implementation Plans. Establish measurable nitrogen, phosphorus and sediment reductions alongside ecosystem restoration.
12. Washington State Department of Ecology and United States Environmental Protection Agency. Lower Duwamish Waterway Source Control Program, Source Control Action Plans and sediment-cleanup decisions. The program divides the watershed into 24 source-control areas and applies a source-control sufficiency test before major in-water remediation.
13. Patmont, C.R., and Healy, R. 2024. “Puget Sound sediment cleanup remedy effectiveness retrospective.” Integrated Environmental Assessment and Management, 20(5), 1355–1365. DOI: 10.1002/ieam.4890.
14. San Francisco Bay Regional Water Quality Control Board. Site Cleanup Program, stormwater programs and San Francisco Bay Basin Plan provisions governing contaminated sites, dredged material, water quality and habitat restoration.
15. Capital Regional District. 2024 Core Area Stormwater Quality Program Report. Documents bacterial and chemical monitoring of Core Area stormwater discharges, continuing high public-health concern ratings and discharges recommended for corrective action. The report states that approximately 550 discharges are evaluated across the program area; 195 were sampled for E. coli in 2024, with 40 percent producing at least one count above 400 CFU/100 mL.
16. Gibbs, H.M., Gurnell, A.M., Heppell, C.M., and Spencer, K.L. 2014. “The role of vegetation in the retention of fine sediment and associated metal contaminants in London's rivers.” Earth Surface Processes and Landforms, 39(8), 1115–1127. DOI: 10.1002/esp.3575.
17. Johnston, E.L., and Clark, G.F. 2007. “Recipient Environment More Important than Community Composition in Determining the Success of an Experimental Sponge Transplant.” Restoration Ecology, 15(4), 638–651. DOI: 10.1111/j.1526-100X.2007.00276.x.
18. United States Environmental Protection Agency. Contaminated Sediment Risk Management Principles and Superfund sediment guidance. Emphasizes identifying and controlling significant continuing contaminant sources, assessing recontamination and conducting remedy-effectiveness monitoring.
No comments:
Post a Comment