Environmental Effects Monitoring Studies (EEMS

The Environmental Effects Monitoring Studies (EEMS) are an essential step for companies in the mining and industrial sectors in Canada. They are governed by two federal regulations:

The MMDEM Regulations (Metal and Diamond Mine Effluent Regulationswhich require EEEAs under annex 5.
The PPER Regulations (Pulp and Paper Mill Effluent Regulationswhich set out the same requirements in annex IV.1.

These monitoring programs are not mere administrative formalities: they make it possible to measure the actual impacts of discharges on the environmentverify the effectiveness of mitigation measures, and, if necessary, adapt practices in line with sustainability and the protection of aquatic ecosystems..

Our EEMS services: comprehensive support

We provide technical and regulatory expertise covering all stages of EEMS, from the initial plan to the final report.

Development of study plans tailored to legal requirements and the specific features of your project.
Impact monitoring: water quality, sediments, fish, and benthic invertebrates.
Investigation of causes in the event of observed effects.
Laboratory dissections andfish age analysis..
Identification of benthic invertebrates and creation of reference collections..
Statistical analysis and scientific interpretation of effects.
Reporting in accordance withEnvironment and Climate Change Canada (ECCC) requirements..
Assistance with annual sampling planning and data compilation for provincial (SENV) and federal (SDEM) reports.
Support in communications with authorities and management of regulatory deadlines..

We can also assist you with related mandates such as ecological characterization or compensation for fish and wetland habitat lossin order to offer a comprehensive and integrated solution.

Types of studies included in EEMS

EEMS comprise several complementary components, which differ depending on the applicable regulation:

1) Sublethal toxicity tests

• REFPP: mandatory 1 to 2 times per calendar year (section 29).

• REMMMD: conducted as needed, at the request of ECCC (App. 5, Part B).

• Objective: to evaluate the survival, growth, and reproduction of sensitive aquatic organisms (algae, daphnia, fish) exposed to effluents.

2) Characterization of effluents and biological monitoring areas

• REFPP: monitoring of organic parameters (BOD, TSS, AOX, dioxins/furans).

• REMMMD: monitoring of metals, pH, and TSS, with specific requirements for mercury and selenium.

• Frequency: generally monthly or quarterly, to ensure ongoing compliance.

3) Biological monitoring studies

• REFPP: mandatory every 3 years (or 6 years if no effects detected), unless a cause investigation study is to be conducted.

• REMMMD: mandatory every 3 years (or 6 years if no effects detected), unless a cause investigation study is to be conducted.

• Includes sampling of fish (growth, reproduction, condition) and benthic invertebrates (composition, abundance).

• Objective: to establish or confirm the presence or absence of effects on aquatic environments and provide reliable data for environmental management.

4) Cause investigation studies

• Alternative to biological monitoring studies, to be carried out when biological monitoring of two consecutive cycles confirms similar significant effects.

• Enable the identification of the sources and mechanisms responsible (specific contaminants, hydrological conditions, cumulative interactions).

• The methodology is adapted according to the effects detected, with analyses targeting the contaminant or parameter in question.

• Lead to the proposal of appropriate corrective measures and verification of their effectiveness in subsequent cycles.

REMMMD vs. REFPP: what are the differences?

Although both regulations share the same objective— to protect fish, their habitat, and their use —their terms differ in several key respects.

1. Mandatory framework

Mining (REMMMD) ESEE are automatic and systematic for any site that rejects more than 50 m³/day of effluent or who deposits a harmful substance into water frequented by fish.

Pulp and paper (REFPP) ESEE are automatic and systematic for any site that discharges more than 50 m³/day of effluent or deposits a deleterious substance in water frequented by fish.

2. 2. Parameters monitored

Mining (REMMMD) Monitoring focuses primarily on contaminants resulting from ore processing (metals, suspended solids). Concentrations of mercury and of selenium in effluent determine whether fish tissue analyses should be conducted.
Pulp and paper (REFPP) the focus is on rganic compounds (BOD, AOX, bleaching by-products). Concentrations of chlorinated dioxins and of furans are used as indicators to decide whether fish tissue analyses are necessary (Appendix V).

3. Regulatory calendar

The regulatory calendars of the REMMMD and the REFPP have many similarities, particularly in the following areas:

Three-year cycle duration
Possibility of reducing the frequency of follow-ups for certain studies if two consecutive cycles have shown no effect
Minimum period of 6 months between submission of the study plan and completion of the biological monitoring sampling campaign
Submission of the interpretation report for the first cycle at a site no later than 3 years after becoming subject to the program

The following characteristics differ between the REMMMD and the REFPP:

Period	Mining (REMMMD)	Pulp and paper (REFPP)
First cycle schedule following subjection	The first study plan must be submitted within 12 months of subjection..	No additional requirements related to the first cycle study plan.
Closure	In the event of effluent closure, a final study is required, with a plan to be submitted within 6 months of notification and a final report within 3 years.	In the event of aproduction shutdown for at least eight consecutive months without resumption of production, biological monitoring studies are put on hold.

These differences directly influence planningthe resource management and the compliance strategy. Specialized support ensures effective monitoring without the risk of delays or non-compliance.

Conclusion

EEMS are both a regulatory obligation and a strategic opportunityWhen well designed and implemented, they strengthen companies’ environmental credibility and facilitate dialogue with authorities.

Our team supports you from the study plan to the submission of the final reportwith a customized, rigorous approach that is aligned with federal requirements.

Contact us today to transform your regulatory obligations into levers for performance and sustainability.

Marianne Côté, bio. M.Sc., environmental professional