Conrie Field Development Environmental Statement - Metoc

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ENQUEST DONS LTD CONRIE FIELD DEVELOPMENT Spatial Extent of Impacts: whether the impact effects the local, regional or wider environment Sensitivity of Receiving Environment: the nature, importance (i.e., whether of local, national, regional or international importance) and the sensitivity or adaptability to change of the receptors or resources that could be affected. This also takes account of any laws, regulations or standards aimed at protecting the receiving environment Recoverability of Receptor: how long until the receptor will return to preimpact condition. These are further defined in Table 4-6. Table 4-6: Severity definitions Term Value Definition Impact Duration Short 1 The interpretation of these descriptors varies according to the impact topic. Moderate 2 For example, a short term impact to the seabed, such as the effects of leveling works, may last for a year, whereas a short term impact to water Long 3 quality, such as effects from the discharge of water based mud, could involve Permanent 4 a period of 12 to 24 hours. Spatial Extent Local 1 Widespread 2 The primary zone of influence of the project. In this instance the local region encompasses the area within a radius of 1 km around the project footprint. Impacts extend beyond project locality to impact on the region. The region in this instance would encompass the Northern North Sea. Extensive 3 Impacts on a national scale (effects well beyond the NNS). Global 4 Impacts on a global scale (e.g., global warming). Sensitivity of Receiving Environment Low 1 Medium 2 High 3 Very High 4 Recoverability of Receptors Abundant/ common species/ environment and broadly distributed Robust in nature and proven to be adaptable to changing environments Valued but not unique Range/ abundance covers numerous regions Under pressure but has some ability to adapt to changing environment Valued locally as an important species or environment Range/ abundance restricted to a limited number of areas Under pressure and showing some, but slow, adaptability to changing environment Valued regionally as an important species or environment Rare/ unique species/ environment Under significant pressure and likely to fail or be irreversibly damaged Valued globally as an important species or environment Short 1 The interpretation of these descriptors varies according to the impact topic. Moderate 2 For example, a long recoverability to plankton species, such as the toxic effects of a chemical discharge may last a few months. Whereas a long Long 3 recoverability to some fish species, such as removal of benthic breeding Irreversible 4 habitat, could involve a period of 10 to 20 years. REPORT REFERENCE: P1534_RN2574_REV1_S1-4 4-14 19/04/2011
ENQUEST DONS LTD CONRIE FIELD DEVELOPMENT The outcomes from each of the above factors were then tallied to decide an overall grading value of the severity of a particular impact. Where quantification of potential impacts is possible, the decision has been based on numerical values, representing regulatory limits, project standards or guidelines (e.g., noise and air quality impacts). A number of environmental aspects such as ecology, landscape, visual and generally all human impacts require a more qualitative approach for determining severity. Semi-quantitative and/or qualitative methods have therefore been used whereby the criteria have been set according to severity factors as defined in Table 4-6 above. The severity factors have been scored with a numeric value from 1 to 4. The sum of values for each of the factors was used to determine the overall severity as summarised in the scale outlined below: Negligible (sum of values 4 - 6) Low (sum of values 7 - 9) Medium (sum of values 10 - 12) High (sum of values 13 - 16) 4.1.4.6 Assessing Impact Significance For the potential impacts associated with the Conrie Field, the significance of each impact is determined by assessing the impact severity against the likelihood of the impact occurring as summarised in the impact significance assessment matrix provided in Table 4-7. It is important to emphasise that the resulting significance from these two elements is not the likelihood of the activity occurring, but rather it is the likelihood of that activity causing the impact described. Table 4-7: Environmental and human impact significance assessment matrix Likelihood Severity Unlikely Possible Probable Certain Negligible (4-6) Insignificant Minor Minor Minor Low (7-9) Minor Minor Moderate Moderate Medium (10-12) Minor Moderate Moderate Major High (13-16) Moderate Moderate Major Critical Based on the outcome of the significance assessment the following points need to be considered: Critical Significance It is not possible to manage or mitigate critical impacts. These require the identification of alternatives (elimination of source of potential impact). Such impacts are intolerable and could potentially result in abandonment of a project. REPORT REFERENCE: P1534_RN2574_REV1_S1-4 4-15 19/04/2011
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Conrie Field Development Environmental Statement - Metoc

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