Environmental impact assessment
The full impact-assessment procedure (L.122-1)
The environmental impact assessment (French L.122-1) is the comprehensive procedure documenting a project's effects on the environment and the corresponding measures.
Environmental impact assessment
The environmental impact assessment (French L.122-1) is the comprehensive procedure documenting a project's effects on the environment and the corresponding measures. ARKENOR produces the ecological components and coordinates the biodiversity evidence within the wider study.
Scope
One file, many disciplines, one weakest section.
The environmental impact assessment is the container for everything a project has to demonstrate: ecology, water, noise, air, landscape, traffic, and the cumulative effects of neighbouring projects. It is examined by an independent environmental authority whose opinion is published, and to which the developer must respond in writing.
Because it is examined as a whole, its quality is set by its weakest section. A rigorous ecological study attached to a superficial acoustic one produces an opinion that criticises the acoustic one, and the project answers for both.
Cumulative effects
The part that reaches beyond the project boundary.
Assessments must consider effects that combine with other known projects in the area, including ones the developer does not control. This is the section that most often surprises teams from other jurisdictions, and it cannot be answered from within the site: it requires knowing what else is planned nearby and reasoning about interaction.
The response to the authority's opinion is public and forms part of the record. A clear response to a critical opinion is frequently more persuasive than an uncriticised file, because it shows the method holding up under examination.
Response
The reply to the authority is part of the file.
The environmental authority's opinion is published, and the developer's written response is published with it. That exchange is read by the public, by associations and, if it comes to it, by a judge. A response that answers each point specifically, including by conceding where the criticism is fair, carries more weight than one that restates the original study.
This is also where the separation between producing a study and verifying it becomes visible. An assessment whose method holds up under public examination is worth more than one that was never examined.
Going further
Related pages.
The impact assessment draws together several distinct files.
- Natural component (VNEI) — the ecological chapter
- Four-season surveys — the underlying evidence
- Natura 2000 incidence assessment — cumulative, not alternative
- Water Act file — where works affect water
- ICPE acoustics — the acoustic chapter for classified sites
- Avoid-reduce-offset sequence — the structure of the response to impacts
- Working on infrastructure projects — where cumulative effects bite hardest
- Ecological expertise — the full set of procedures
- EU Directive 2024/825 — substantiation of environmental claims
- IRICE, certification body — the separation between assessing and designing
- ARKENOR: environmental project management — assembling and defending the file
Discuss your project
Engineering, environmental advisory and independent certification under one group, with a strict separation of roles.
Sans engagement · Réponse sous 48 h ouvrées · Données confidentielles