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Nuclear 1’) and Associated Infrastructure ENVIRONMENTAL IMPACT ASSESSMENT FOR THE PROPOSED NUCLEAR POWER STATION (‘NUCLEAR 1’) AND ASSOCIATED INFRASTRUCTURE Marine Ecology Impact Assessment March 2011 Prepared by: Professor CL Griffiths and Dr TB Robinson Prepared for: Arcus GIBB Pty Ltd On behalf of: Eskom Holdings Ltd March 2011 DECLARATION OF INDEPENDENCE l, Professor Charles Griffiths hereby confirm my independence as a specialist and declare that I do not have any interest, be it business, financial, personal or other, in any proposed activity, application or appeal in respect of which Arcus GIBB was appointed as environmental assessment practitioner in terms of the National Environmental Management Act, 1998 (Act No. 107 ol lgg8), other than fair remuneration for worked performed, specifically in connection with the Environmental lmpact Assessment for the proposed conventional nuclear power station ('Nuclear 1'). I further declare that I am confident in the results of the studies undertaken and conclusions drawn as a result of it - as is described in my atl Full Name: Professor Charles Qualif ication(s): PhD Experience (years/ months) : 35 Years EXECUTIVE SUMMARY This specialist study was undertaken to assess the possible impacts of a 4 000 MW capacity power station on the marine environment at one of three potential sites along the Eastern and Western Cape coasts. Such a development at Duynefontein, Bantamsklip or Thyspunt will have a variety of potential impacts. These include: • Disruption of surrounding marine habitats. When associated with the construction of the cooling water intake and outfall system, this effect will be focused within the construction phase and will be localised, of medium duration and significance . When associated with the discarding of spoil, disruption to the marine environment is significant. When mitigated by disposing spoil offshore (and by using only a medium pumping rate at Thyspunt), the impact is reduced to one of medium consequence and medium significance The temporal and spatial limitations of the impacts associated with the disposal of spoil on chokka squid at Thyspunt will have limited impact on the overall squid stock, when taken within the context of the extensive area over which this species spawns. • The entrainment and death of organisms associated with the intake of cooling water. At Duynefontein and Thyspunt entrainment it is not anticipated to have important ecological impacts. However, at Bantamsklip larval entrainment may have a significant negative impact on local stocks of the abalone Haliotis midae . • The release of warm water used for cooling purposes. A tunnelled design of the release system mitigates potential negative impacts, through multiple points of release to aid dissipation of excess heat, by releasing cooling water above the sea bottom to minimise effects on the benthic environment and by utilising a very high flow rate at the point of release to maximise mixing with cool surrounding water. Comprehensive oceanographic modelling has demonstrated that the effects of elevated temperature are expected to be focused on the open water habitat. This is of particular relevance at Bantamsklip and to a lesser degree at Thyspunt, as it would help to mitigate impacts on abalone and chokka squid egg capsules respectively. While chokka squid at the Thyspunt site are expected to avoid water temperatures elevated above their thermal tolerance range, the area predicted to be affected represents less than one percent of the coastal spawning ground. It is strongly recommended that at Bantamsklip an offshore tunnel outfall be utilised for the release of warmed water in an effort to mitigate impacts on abalone. Importantly a nearshore release system at this site is considered to pose an unacceptable risk to abalone populations. • The release of desalination effluent. During construction limited volumes of hypersaline effluent (brine) will be released directly into the surf zone, where high energy water movement will result in adequate mixing with surrounding seawater to ensure minimal impact on the marine environment. During the operational phase the desalinisation effluent will be co-released with cooling water. As brine will be diluted to undetectable levels prior to release, no impact on the marine environment is predicted from this effluent during the operational phase. • The unintentional release of radiation emissions. Technical design of the cooling system has minimised this risk, so that this impact is rated as having low consequence and low significance. • The additional protection of marine organisms from exploitation due to a safety exclusion zone. The only site that would benefit from such an exclusion zone is Bantamsklip, as this could be of great benefit to what are currently illegally harvested abalone populations. However, for such a benefit to be realised, adequate enforcement of the exclusion zone should be provided. • The release of treated sewage effluent. This effluent will meet the standards set by the Department of Water Affairs and Forestry and, as such, no significant impact on the marine environment is expected. • Pollution of the marine environment by the discharge of groundwater polluted by organic, bacterial or hydrocarbon compounds. As this impact is unlikely to occur and will be spatially and temporally restricted, it is considered to be of low consequence and significance. Besides the impacts of the proposed development on marine habitats, organisms in the marine environment may also impact on the development. This would take the form of fouling of cooling water pipes. This impact is anticipated to be most significant at Duynefontein, due to its location along the west coast, where jellyfish blooms appear to be increasing in frequency. ENVIRONMENTAL IMPACT ASSESSMENT FOR THE PROPOSED NUCLEAR POWER STATION (‘NUCLEAR-1’) AND ASSOCIATED INFRASTRUCTURE CONTENTS Chapter Description Page 1 INTRODUCTION 1 1.1 Background 1 1.2 Study Approach 1 1.2.1 Assumptions and limitations 2 1.2.2 Assessment criteria 2 2 DESCRIPTION OF AFFECTED ENVIRONMENT 5 2.1 Duynefontein 5 2.1.1 General Description 5 2.1.2 The Intertidal Zone 6 2.1.3 The Benthic Environment 7 2.1.4 The Open Water Environment 7 2.1.5 Avifauna 8 2.2 Bantamsklip 8 2.2.1 General Description 8 2.2.2 The Intertidal Zone 9 2.2.3 The Benthic Environment 10 2.2.4 The Open Water Environment 10 2.2.5 Avifauna 12 2.3 Thyspunt 13 2.3.1 General Description 13 2.3.2 The Intertidal Zone 13 2.3.3 The Benthic Environment 14 2.3.4 The Open Water Environment 14 2.3.5 Avifauna 16 3 IMPACT IDENTIFICATION AND ASSESSMENT 17 3.1 Duynefontein 17 3.1.1 Disruption of the marine environment during construction 17 3.1.2 Abstraction of cooling water and subsequent entrainment of organisms 19 3.1.3 Release of warmed cooling water 20 3.1.4 Release of desalination effluent 21 3.1.5 Radiation emissions 22 3.1.6 Closure of the site to exploitation 23 3.1.7 Release of sewage effluent 24 Marine Ecology Study March 2011 3.1.8 Unintentional discharge of polluted groundwater 24 3.1.9 Impacts of the environment on the proposed development 24 3.2 Bantamsklip 26 3.2.1 Disruption of the marine environment during construction 26 3.2.2 Abstraction of cooling water and subsequent entrainment of organisms 28 3.2.3 Release of warmed cooling water 28 3.2.4 Release of desalination effluent 30 3.2.5 Radiation emissions 30 3.2.6 Closure of site to exploitation 30 3.2.7 Release of sewage effluent 31 3.2.8 Unintentional discharge of polluted groundwater 31 3.2.9 Impacts of the environment on the proposed development 31 3.3 Thyspunt 31 3.3.1 Disruption of the marine environment during construction 31 3.3.2 Abstraction of cooling water and subsequent entrainment of organisms 33 3.3.3 Release of warmed cooling water 34 3.3.4 Release of desalination effluent 35 3.3.5 Radiation emissions 35 3.3.6 Closure of the site to exploitation 36 3.3.7 Release of sewage effluent 36 3.3.8 Unintentional discharge of polluted groundwater 36 3.3.9 Impacts of the environment on the proposed development 36 4 ENVIRONMENTAL ASSESSMENT 37 4.1 Duynefontein 37 4.1.1 Disruption of the marine environment during construction 37 4.1.2 Abstraction of cooling water and subsequent entrainment of organisms 37 4.1.3 Release of warmed cooling water 37 4.1.4 Release of desalination effluent 38 4.1.5 Radiation emissions 38 4.1.6 Closure of the site to exploitation 38 4.1.7 Release of sewage effluent 38 4.1.8 Unintentional discharge of polluted groundwater 38 4.1.9 Impacts of the environment on the proposed development 38 4.2 Bantamsklip 38 4.2.1 Disruption of the marine environment during construction 39 4.2.2 Abstraction of cooling water and subsequent entrainment of organisms 39 4.2.3 Release of warmed cooling water 39 4.2.4 Release of desalination effluent 39 4.2.5 Radiation emissions 39 4.2.6 Closure of the site to exploitation 40 4.2.7 Release of sewage 40 4.2.8 Unintentional discharge of polluted groundwater 40 4.2.9 Impacts of the environment on the proposed development 40 4.3 Thyspunt 40 4.3.1 Disruption of the marine environment during construction 40 Marine Ecology Study March 2011 4.3.2 Abstraction of cooling water and subsequent entrainment of organisms 41 4.3.3 Release of warmed cooling water 41 4.3.4 Release of desalination effluent 41 4.3.5 Radiation emissions 41 4.3.6 Closure of the site to exploitation 41 4.3.7 Release of sewage effluent 41 4.3.8 Unintentional discharge of polluted groundwater 41 4.3.9 Impacts of the environment on the proposed development 42 4.4 The no-go Alternative 42 4.5 Relevant legislation 42 5.
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