Bacton NTS Table 6.2

Bacton NTS Table 6.2

Transcript

1. 18 July 2018 Table 6.2 Summary of potential environmental receptors, potential impacts, mitigation measures, residual impacts and monitoring methods 1 ES Chapter Environmental Receptor Potential Impact Impact Significance Mitigation Residual Impact Monitoring 6 Coastal Processes and Geology Coastal processes Elevated suspended sediment concentrations at the coast may be generated by placement of the slurry (sand and water) from the discharge pipe No impact upon identified receptors Cromer Shoal Chalk Beds MCZ The increases in suspended sediment concentrations associated with the placement of the sand engine have the potential to result in changes in sea bed levels as the suspended sediment deposits. Changes in substrate at the Cromer Shoal Chalk Beds MCZ during construction could potentially occur if sediment was deposited on top of the chalk outcrops. No impact identified upon Cromer Shoal Chalk Beds MCZ. BGT employees and Village residents Buffering of wave energy leading to a reduction in coastal erosion and overtopping for: Bacton Gas Terminal; and The Villages. BGT: Major beneficial Villages: Moderate beneficial Mundesley Cliffs Site of Special Scientific Interest (SSSI) and Bacton Cliff Candidate County Geological Site (CCGS) Potential loss of exposure of geological interest within a section of the Mundesley Cliffs Site of Special Scientific Interest (SSSI) and Bacton Cliff Candidate County Geological Site (CCGS) due to a reduction in erosion of the cliff along the northern edge of the terminal frontage. The site is designated for its continuing exposure of geological information. Moderate adverse impact A mitigation strategy encompassed in a Scheme for Geological Recording, Monitoring and Management should be completed. This should be produced by the developer with input from Natural England and the Norfolk Geodiversity Partnership and include monitoring and management after placement so that impacts can be measured. This would also include an agreement on access to the cliff sites behind the sand engine Minor Impact Pre-construction monitoring by and appropriate geology specialist (Quaternary scientist) of the Mundesley and Bacton cliffs and shore platforms to record the geological interest at the sites which would become covered or inaccessible during the operational phase of the sand engine. Annual monitoring (which may be reduced in frequency after a few years depending on the outcomes) of geology, vegetation growth and mass movement activity in the area of the cliff affected
2. 18 July 2018 2 ES Chapter Environmental Receptor Potential Impact Impact Significance Mitigation Residual Impact Monitoring 6 Coastal Processes and Geology Geological and coastal processes The operation of the sand engine would constitute a new source for wind-blown sand and, given the increased height of the berm, increase its potential to transport landward and over the top of the cliff, where it could affect the functioning of Terminal infrastructure. No impact on geological or coastal processes Geology / local people Change in provenance of the beach through importation of foreign sediment. Minor adverse Coastal processes Changes in the nearshore bathymetry and beach topography caused by placement of the sand engine would potentially lead to changes in wave climate. No impact beyond the immediate nearshore zone. Coastal processes Changes in the nearshore bathymetry and beach topography caused by placement of the sand engine could potentially lead to changes in tidal currents. No impact beyond shallow nearshore zone. Coastal processes Interruption of sediment transport by outfall pipes. No impact beyond shallow nearshore zone. 7 Flood Risk Coastal Flooding Effect on the flooding potential across the Villages frontage No impact Coastal Flooding Flood prevention Moderate Beneficial 8 Water and Sediment Quality Water and Sediment quality Elevated suspended sediment concentrations generated by placement of the sand using suction dredgers. Moderate impact
3. 18 July 2018 3 ES Chapter Environmental Receptor Potential Impact Impact Significance Mitigation Residual Impact Monitoring 8 Water and Sediment Quality Sediment quality Increases in suspended sediment concentrations associated with the construction of the sand engine have the potential to result in changes in sediment characteristics as the material deposits. Negligible Construction works for the outfall extensions Negligible Water and sediment quality Potential impacts associated with periodic replenishment of sand during operation. Negligible Water quality Potential impacts associated with extension of outfalls on water quality. No impact 9 Benthic and coastal ecology Terrestrial vegetation: marram grass and other scrub vegetation Faunal colonisation: algae, barnacles, limpets and lugworm. Direct smothering in nourishment zone and increase in suspended sediment concentrations. Minor adverse Nearshore scientific dive survey along the coastline. Record of epi-benthic species present Broad scale habitats: EUNIS classifications; littoral sand and muddy sand. Littoral mixed sediments. Direct impact of dredging to broad-scale habitats in the proposed nourishment zone.Minor adverse
4. 18 July 2018 4 ES Chapter Environmental Receptor Potential Impact Impact Significance Mitigation Residual Impact Monitoring 9 Benthic and coastal ecology Cromer Shoal Chalk Reef MCZ Direct impact of proposed nourishment. No impact Shallow subtidal area: high energy infralittoral rock, sublittoral coarse sediment and moderate energy infralittoral rock. Direct impact of proposed nourishment. No impact Infauna and epibenthos Increase in suspended sediment concentrations Minor adverse Cromer Shoal Chalk Beds MCZ Changes in sea bed level and substrate type due to deposition from suspension during placement No impact Ross worm (Sabellaria spinulosa) Smothering of features by sand placement and subsequent transport Negligible Shallow subtidal area: high energy infralittoral rock, sublittoral coarse sediment and moderate energy infralittoral rock. Impacts due to outfall construction and operation No impact 10 Terrestrial Ecology Terrestrial habitats and vegetation Wind-blown sand affecting terrestrial ecology features Negligible
5. 18 July 2018 5 ES Chapter Environmental Receptor Potential Impact Impact Significance Mitigation Residual Impact Monitoring 10 Terrestrial Ecology Terrestrial habitats Impact of construction and operation of sand engine on habitats within the proposed scheme. Negligible Legally protected sites Impact of construction and operation of sand engine on legally protected species Negligible 11 Marine Mammals Harbour porpoise, harbour seal and grey seal Disturbance from underwater noise during construction from: Dredging; Vessels; and Vessel collisions. - Negligible to Minor adverse - Negligible to Minor adverse - Negligible Grey and harbour seal haul-out Disturbance at seal haul-out sites Negligible Grey and harbour seal Visual disturbance to seals during construction such as temporary infrastructure, machinery and people or changes to lighting levels on land. Negligible to minor adverse Harbour porpoise, grey seal and harbour seal Seabed disturbance during dredging can increase suspended sediments and create sediment plumes. Negligible Harbour porpoise, grey seal and harbour seal Accidental release of contaminants through: Spillage; Disturbance of seabed sediments during dredging. Negligible Grey seal; Harbour porpoise Changes in prey availability during construction due to increased suspended sediment concentrations and sediment re- deposition and underwater noise. Negligible: grey seal Negligible to minor adverse: harbour porpoise
6. 18 July 2018 6 ES Chapter Environmental Receptor Potential Impact Impact Significance Mitigation Residual Impact Monitoring 12 Ornithology Little tern and ringed plover Increase in suspended sediment concentrations impacting on bird foraging. Minor adverse As the construction works are likely to take place during the breeding season, surveys should be carried out prior to work taking place. If nests are found, it should be noted that all wild birds, their nests and eggs are afforded legal protection under the Wildlife and Countryside Act 1981 (as amended), and therefore works in the vicinity of the nest may have to be delayed until any chicks have fledged. Sand martin Smothering of nests due to sand placement, specifically on sand martin nests in the proposed nourishment zone. TBC As above. It is advised to make the cliffs in the vicinity of the working area uninviting to the sand martins before they arrive, no later than early March, so that the scheme could continue. Breeding terns Direct disturbance from vessel transits to and from aggregate extraction site to proposed scheme location, specifically on breeding terns Negligible Little tern Smothering of features by sand placement and subsequent transport Potential beneficial 13 Commercial and Recreational Navigation Vessels The construction phase dredging vessels will increase the risk of vessel to vessel collisions. Minor adverse All proposed dredge activities and all other navigation activities to be undertaken in accordance with: Applicable navigation regulations; Guidance (such as Guide to Good Practice for Ensuring Navigation Safety during Dredging Operations); Notice to Mariners (NtMs); Ensuring vessels exhibit signals as per the requirements of COLREGS; Use of the Traffic Separation Scheme (TSS); and use of designated harbour approaches. Marine ecology and human receptors There is a potential risk associated with accidental pollution from ships such as oil, waste or sewage. Minor adverse
7. 18 July 2018 7 ES Chapter Environmental Receptor Potential Impact Impact Significance Mitigation Residual Impact Monitoring 14 Commercial and recreational fisheries Commercial and recreational fishing activities – specifically trawling and setting or retrieving gear (such as pots and nets) Potential disruption to fishing activities due to vessel movements between the extraction site and the beach at Bacton Negligible Local fishing activity – May-November, crab and lobster; September -March, whelk. Potential disruption to inshore fisheries due to construction activity at the beach fronting Bacton Gas Terminal Minor adverse EIFCA taking ad-hoc randomised whelk samples from fishermen. Measuring and assessing maturity with an aim of providing more scientific basis for setting MLS. Samples received on a monthly basis, first ones taken in January 2018. Recreational fishing Potential changes to access to the beach for recreational fisheries as during construction period, for an estimated eight weeks, sections of the beach would be closed to public access 24 hours a day, 7 days a week. Minor adverse Adjacent fishing areas Vessel displacement to other fishing grounds could indirectly influence other local fisheries. Minor adverse Recreational fishing Potential for access to the beach to change following the works. Minor beneficial 15 Archaeology and Historic Environment World War II anti-tank blocks and the remains of an anti-tank pillbox on Walcott Beach. Three anti-tank cubes associated with former coastal defences Direct impacts to potential heritage assets (above ground remains) due to the placement of pipes construction works for the outfall extensions, or anchor placement. Moderate adverse Above ground remains will be left in situ. Implementation of an archaeological reporting protocol during outfall trenching works. If anchoring is required, an anchoring strategy will be developed to ensure that the location of known marine heritage assets (if present) are taken into account and avoided Minor adverse
8. 18 July 2018 8 ES Chapter Environmental Receptor Potential Impact Impact Significance Mitigation Residual Impact Monitoring 15 Archaeology and Historic Environment Indirect impacts on the setting of heritage assets related to the presence of a dredging vessel, pipes and land-based plant, including visual impact, noise, smell and dust. Negligible Indirect impact on archaeological remains due to changes to coastal processes during operation. No impact Indirect impact on the setting of heritage assets due to the presence of increased levels of sand. Minor adverse 16 Local Community and Tourism Local community and tourism During construction, there will be temporary impacts associated with increased noise levels and access disruption. Minor adverse Local community Benefit of the scheme providing a feature of interest to some people who enjoy watching construction activities. Minor beneficial Local community and tourism Protection of the coastline. Major beneficial Local community and tourism Improved access to the coastal footpath during operation. Minor beneficial Local community and tourism – south east of the works Potential for the gain of beach material further south-east of works to improve protection for downdrift properties. Moderate beneficial 17 Services and other users of the sea Pipelines Potential for damage to pipelines buried beneath the beach Moderate adverse
9. 18 July 2018 9 ES Chapter Environmental Receptor Potential Impact Impact Significance Mitigation Residual Impact Monitoring 17 Services and other users of the sea Outfalls Impact on the outfalls due to direct and indirect (hydrodynamic) impacts resulting from placement of sand for nourishment Minor adverse Divers Sediment plume affecting divers Minor adverse 18 Traffic Users of A149 west of B1159 to the A1151 and A149 east of B1159 to Catfield Impact of construction traffic on total daily traffic. Negligible North Walsham Road - Edingthorpe Green Impact of construction traffic on total daily traffic. Minor adverse B1159 south of Walcott Impacts on pedestrian amenity Negligible B1159 (West of Broomholm) and B1159 (East of Broomholm to Walcott) Impacts on pedestrian amenity Minor adverse All local areas Impacts on driver delay Negligible 19 Air Quality Human and ecological receptors Impact of dredging air quality impacts including dust and pollutant emissions. No impact
10. 18 July 2018 10 ES Chapter Environmental Receptor Potential Impact Impact Significance Mitigation Residual Impact Monitoring 19 Air Quality Human and ecological receptors Venting of combined outfall Moderate without design intervention Best practice during design should ensure that any odours do not affect users of the beach. No impact 20 Noise and Vibration Local residents Noise of dredging vessels when pumping sediment onto the beach Use Best Practice Measures throughout. All plant is maintained to ensure noise is minimised. Staff will be trained to follow good working practice guidelines and instructions. Temporary screens or barriers can be used when required. Good relations will be kept with local residents and they will be informed of the works and the schedule through a display board. Human and ecological receptors Construction noise during outfall extension No impact 21 Landscape and Visual Amenity Human receptors Visual impact for local residents and tourists Moderate/minor (adverse and beneficial dependent on perspective) Human receptors Impact on site character Minor adverse 22 Designated Sites Paston Great Barn SSSI, National Nature Reserve (NNR) and SAC Impact of proposed construction works and operation. No impact
11. 18 July 2018 11 ES Chapter Environmental Receptor Potential Impact Impact Significance Mitigation Residual Impact Monitoring 22 Designated Sites Overstrand Cliffs SSSI and SAC No impact Haisborough, Hammond and Winterton – Special Area of Conservation (SAC) No impact Southern North Sea – proposed Special Area of Conservation (pSAC). No impact Winterton - Horsey Dunes SAC and SSSI Greater Wash – proposed Special Protection Area (pSPA) No impact Great Yarmouth North Denes SPA TBC Mundesley Cliffs SSSI TBC Sidestrand and Trimingham Cliffs SSSI No impact
12. 18 July 2018 12 ES Chapter Environmental Receptor Potential Impact Impact Significance Mitigation Residual Impact Monitoring 22 Designated Sites West and East Runton Cliffs No impact Happisburgh Cliffs SSSI TBC Cromer Shoal Chalk Beds MCZ TBC Norfolk Coast Area of Outstanding Natural Beauty (AONB) TBC