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Methodology for assessment of impacts

The potential impacts of the GORM project on the environmental and social receptors (e.g. water quality, climate and fishery) are assessed for exploration, production and decommissioning.

The assessment covers the direct and indirect, cumulative and transboundary, permanent or temporary, positive and negative, impacts of the project. Impacts are evaluated based on their nature, type, reversibility, intensity, extent and duration in relation to each receptor (social and environmental).

The proposed methodology used for assessment of impacts includes the following criteria for categorising environmental and social impacts:

 Value of the receptor

 Nature, type and reversibility of impact

 Intensity, geographic extent and duration of impacts

 Overall significance of impacts

 Level of confidence

4.2.1 Value of receptor

Various criteria are used to determine value/sensitivity of each receptor, including resistance to change, rarity and value to other receptors (Table 4-1).

Table 4-1 Criteria used to assess the value of receptor.

Value

Low A receptor that is not important to the functions/services of the wider

ecosystem/socioeconomy or that is important but resistant to change (in the context of project activities) and will naturally or rapidly revert to pre-impact status once activities cease.

Medium A receptor that is important to the functions/services of the wider

ecosystem/socioeconomy. It may not be resistant to change, but it can be actively restored to pre-impact status or will revert naturally over time.

High A receptor that is critical to ecosystem/socioeconomy functions/services, not resistant to change and cannot be restored to pre-impact status.

4.2.2 Nature, type and reversibility of impacts

Impacts are described and classified according to their nature, type and reversibility (Table 4-2).

Table 4-2 Classification of impacts: Nature, type and reversibility of impacts.

Nature of impact

Negative Impacts that are considered to represent an adverse change from the baseline (current condition).

Positive Impacts that are considered to represent an improvement to the baseline.

Type of impact

Direct Impacts that results from a direct interaction between a planned project activity and the receiving environment.

Indirect or secondary Impacts which are not a direct result of the project, but as a result of a pathway (e.g. environmental). Sometimes referred to as second level or secondary impacts.

Cumulative Impacts that result from incremental changes caused by past, present or reasonably foreseeable human activities with the project.

Degree of reversibility

Reversible Impacts on receptors that cease to be evident after termination of a project activity.

Irreversible Impacts on receptors that are evident following termination of a project activity.

4.2.3 Intensity, geographic extent and duration of impacts

Potential impacts are defined and assessed in terms of extent and duration of an impact (Table 4-3).

Table 4-3 Classification of impacts in terms of intensity, extent and duration.

Intensity of impacts

None No impacts on the receptor within the affected area.

Small Small impacts on individuals/specimen within the affected area, but overall the functionality of the receptor remains unaffected.

Medium Partial impacts on individuals/specimen within the affected area. Overall, the functionality of the receptor will be partially lost within the affected area.

Large Partial impacts on individuals/specimen within the affected area. Overall, the functionality of the receptor will be partially or completely lost within and outside the affected area.

Geographical extent of impacts

Local Impacts are restricted to the area where the activity is undertaken (within 10 km).

Regional There will be impacts outside the immediate vicinity of the project area (local impacts), and more than 10 km outside project area.

National Impacts will be restricted to the Danish sector.

Transboundary Impacts will be experienced outside of the Danish sector.

Duration of impacts

Short-term Impacts throughout the project activity and up to one year after.

Medium-term Impacts that continue over an extented period, between one and ten years after the project activity.

Long-term Impacts that continue over an extented period, more than ten years after the project activity.

4.2.4 Overall significance

The definition of the levels of overall significance of impact are separated for environmental and social receptors (Table 4-4).

Table 4-4 Classification of overall significance of impacts.

Overall significance

Impacts on environmental receptors Impacts on social receptors

Positive Positive impacts on the structure or function of the receptor Negligible

negative

No measurable impacts on the structure or function of the receptor.

Minor negative

Impact to the structure or function of the receptor is localised and immediate or short-term. When the activity ceases, the impacted area naturally restores to pre-impact status.

Impact that is inconvenient to a small number of individual(s) with no long-term consequence on culture, quality of life, infrastructure and services. The impacted receptor will be able to adapt to change with relative ease and maintain pre-impact livelihood.

Moderate negative

Impact to the structure or function of the receptor is local or regional and over short- to medium-term. The structure or ecosystem function of the receptor may be partially lost. Populations or habitats may be adversely impacted, but the functions of the ecosystem are

maintained. When the activity ceases, the impacted area restores to pre-impact status through natural recovery or some degree of intervention.

Impact that is inconvenient to several individuals on culture, quality of life, infrastructure and services. The impacted receptor will be able to adapt to change with some difficulties and maintain pre-impact livelihood with some degree of support.

Major negative

Impact to the structure or function of the receptor is regional, national or

international and medium- to long-term.

Populations or habitats and ecosystem function are substantially adversely impacted. The receptor cannot restore to pre-impact status without intervention.

Impact that is widespread and likely impossible to reverse for. The impacted receptors will not be able to adapt or continue to maintain pre-impact livelihood without intervention.

4.2.5 Level of confidence

It is important to establish the uncertainty or reliability of data that are used to predict the magnitude of the effects and the vulnerability of the receptors, as the level of confidence in the overall level of significance depends on it.

There are three levels of confidence for the impact:

 Low: Interactions are poorly understood and not documented. Predictions are not modelled and maps are based on expert interpretation using little or no quantitative data.

Information/data have poor spatial coverage/resolution.

 Medium: Interactions are understood with some documented evidence. Predictions may be modelled but not validated and/or calibrated. Mapped outputs are supported by a moderate negative degree of evidence. Information/data have relatively moderate negative spatial coverage/resolution.

 High: Interactions are well understood and documented. Predictions are usually modelled and maps based on interpretations are supported by a large volume of data. Information/data have comprehensive spatial coverage/resolution.