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BOC Immingham Dissolved Acetylene Project Environmental Statement: Vol. 2 Main Text Designated Site Qualifying Interest Features Presence of Qualifying Feature in relation to proposed development and Likelihood for Impacts to Occur � operational traffic flows are expected to be lower than those during construction and the impact arising as a result of operational traffic would be negligible; and � process emissions from the facility were assessed for their effects on air quality. In all cases the emissions were found to be insignificant, at less than 1% of the ecological based assessment criteria. Given the distance to the nearest sensitive receptors, the effect of process emissions will be negligible. Emissions to atmosphere will primarily consist of acetylene, acetone, ammonia, phosphine and hydrogen sulphide. As part of the EIA scoping a screening calculation following the methodology described in Annex F of the Environment Agency’s H1 guidance was carried out. On the basis of this screening assessment, both short term and long term releases to air from the proposed facility were considered insignificant and air dispersion modelling was not required. The EA has set EALs for phosphine, ammonia and hydrogen sulphide on account of their potential health effects, and an EAL for ammonia for the protection of vegetation. There are no such EALs for acetylene, which is essentially non-toxic 83 . The long-term PC for ammonia of 0.02 µg/m 3 is less than 1% of the relevant EAL for vegetation and just 2% of the existing background of 1 µg/m 3 . The PEC therefore remains well below the EAL. On this basis, the potential for any effects on sensitive ecological sites can be considered insignificant. Consequently the potential for any effect on nitrogen deposition at salt marsh habitats within the Humber Estuary SAC, approximately 1 km away, is considered to be negligible. The APIS does not have any information on the habitat types or species within the SAC listed under ammonia; nor does APIS have any information on phosphine or hydrogen sulphide. Emissions of these pollutants are anticipated to be extremely small and there are unlikely to be any ecotoxicological effects. No observable effect is anticipated on habitats within 1 km as a result of air quality changes relating to the proposed development. Impact Significance 5100935.404 Environmental Statement August 2011 180
BOC Immingham Dissolved Acetylene Project Environmental Statement: Vol. 2 Main Text Designated Site SSSI, SAC Qualifying Interest Features Sandbanks which are slightly covered by seawater all the time SSSI, SAC Coastal lagoons SSSI, SAC SSSI, SAC Salicornia and other annuals colonising mud and sand Atlantic sea meadows (Glauco-Puccinallietalia maritimae) SSSI, SAC Embryonic shifting dunes SSSI, SAC SSSI, SAC SSSI, SAC SSSI, SAC, Ramsar site SSSI, SAC, Ramsar site SSSI, SAC, Ramsar site SSSI, Ramsar site Shifting dunes along the shoreline with Ammophila arenaria (‘white dunes’) Fixed dunes with herbaceous vegetation (‘grey dunes’) Dunes with Hippophae rhamnoides Sea lamprey (Petromyzon marinus) River lamprey (Lampetra fluviatilis) Grey seal (Halichoerus grypus) Natterjack toad (Epidalea calamita) Presence of Qualifying Feature in relation to proposed development and Likelihood for Impacts to Occur As for construction Impact Significance No significant negative effect 5100935.404 Environmental Statement August 2011 181
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