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Environmental Impact Assessment - Enviro Dynamics Namibia

Environmental Impact Assessment - Enviro Dynamics Namibia

Chapter

Chapter 7:Environmental Impact Assessmentredistributed by the dredging operation primarily because of the a) actual dredging activities; b)habitat disturbance; and 3) sediment plumes (turbidity);3. Impact 3 :The likely impact of dredging ON the recruitment of commercially important species(hake, monk, horse mackerel and small pelagics). The dispersal and survival of juveniles, eggsand larvae will be affected by a) physical disturbance of the fishing grounds and b) sedimentplumes (turbidity);4. Impact 4 : The likely impact of dredging ON the fish biodiversity. Dredging operations will resultin a reduction or loss in biodiversity because of the a) actual dredging operations, b) the habitatdestruction and c) sediment plumes; and5. Impact 5: The likely impact of dredging ON seabirds and marine mammals. Dredging operationswill cause the displacement and/or redistribution of seabirds and mammals due to a) noisepollution b) artificial light intensity and c) disturbance of normal ecosystem processes.The evaluation of the impacts are presented in the tables below.Nature of theimpactExtentThe impact on fishing operations of phosphate dredging on the main Namibian fishingsectors; a) hake trawl and b) hake longline, c) monk trawl d) horse mackerel mid-watertrawl, and e) small pelagic purse seine fisheries. The fishing sectors will not be able tooperate in certain areas due to 1) actual mining operations due to dredging operationsand vessel activities, 2) associated sediment plumes 3) exclusion zones around thedredging site and 4) increase levels of maritime traffic associated with the dredgingoperation.MLA - fishing operations will be affected in the MLA and beyond to within a 25 kmboundary of the actual target dredging sites SP-1, SP-2 and SP-3.DurationLong term - the direct impact will cease once the dredging activity ends after 20 years(the period for which the mining licence is issued). Thereafter the recovery of the fishinggrounds and fish abundance to levels prior to the commencement of dredging operationsis expected to take up to 20 years (long term)IntensitySerious effects - significant impacts will occur for the duration of dredging in the MLA,moderate effects are expected to occur in the long term once dredging ceases (up to 20years).ProbabilityStatus (+ or -)Definite- consequences will occur in all instances for the duration of dredging. Oncedredging ceases consequences are expected to occur in some instances (moderateeffects) within the MLA and persist at a reduced level in the long term within the 25 kmboundary zone.Negative - the impact will result in a direct loss in fishing operations in MLAFinal ReportNamibian Marine Phosphate (Pty) Ltd.Page 7-9

Chapter 7:Environmental Impact AssessmentSignificance (nomitigation)MitigationSignificance (withmitigation)Confidence levelMedium - the project design might require modification to accommodate certain fishingoperationsConsider options to minimise impact on fishing operations for example options withrespect to spatial and temporal area closures.Medium to lowHigh - the evaluation is based on good qualitative and quantitative, historical and currentfisheries related data.Nature of theimpactThe impact of phosphate dredging on the ecologically important demersal and pelagic fishspecies. The impact will result in the redistribution and/or displacement of hake, monk, horsemackerel, sole, orange roughy, bearded goby populations and small pelagics because of 1)actual recovery activities due to dredging operations and vessel activities 2) habitatdisturbances and the removal of substrate and 3) sediment plumes (turbidity)ExtentMLA - demersal and pelagic fish species will be displaced or redistributed from inside the MLAand possibly from the surrounding areas into Zone 1.DurationIntensityProbabilityStatus (+ or -)Significance(no mitigation)MitigationPermanent (>20 yrs) - the impact will cease once the dredging activity ends after 20 years (theperiod for which the mining licence is issued) however fish recovery is expected to occursoonerModerate effects - only a small fraction (compared to the regional extent) of fish inhabit theMLA and fish populations will recovery or settle in areas after dredging operations ceaseshowever habitat destruction may cause a longer period of recovery particularly for monk andsole.Highly probable - fish (and in particular demersal fish) are expected to move away from thedredging activity resulting in displacement of biomassNegativeMedium - the duration of the impact is permanent but recovery of fish populations in the areamay occur in the long term. The intensity is minor to moderate and the extent is confined tothe MLA and Zone 1In terms of the ecosystem as a whole there are no particular mitigation measure that can beimplemented.Significance(withmitigation)ConfidencelevelNot applicable (no mitigation alternatives)Low to medium - assumptions based on fish ecology is limited by the data availableFinal ReportNamibian Marine Phosphate (Pty) Ltd.Page 7-10

Final - Enviro Dynamics Namibia
Environmental Management Plan - Enviro Dynamics Namibia
Chapter 0 - Cover Summary.pdf - Enviro Dynamics Namibia
Cover Summary - Enviro Dynamics Namibia
Environmental Management Plan - Enviro Dynamics Namibia
Marine Benthic Study.pdf - Enviro Dynamics Namibia
Fisheries - Enviro Dynamics Namibia
Water Column Study.pdf - Enviro Dynamics Namibia
Water Column Study - Enviro Dynamics Namibia
Comment Responses - Enviro Dynamics Namibia
Draft Social Impact Assessment - Enviro Dynamics Namibia
chapter 1. introduction - Enviro Dynamics Namibia
Marine Benthic Study - Enviro Dynamics Namibia
Chapter 6 - Public Consultation.pdf - Enviro Dynamics Namibia
Chapter 5 - Socio-economics.pdf - Enviro Dynamics Namibia
Chapter 2 - Legislation and Policy.pdf - Enviro Dynamics Namibia
Appendix 1a - Fish and Fisheries Study - Enviro Dynamics Namibia
Appendix 1d - Jellyfish Study.pdf - Enviro Dynamics Namibia
Sandpiper Project - Enviro Dynamics Namibia
Environmental Management Plan - Enviro Dynamics Namibia
Enviro Dyanmics presentation - Enviro Dynamics Namibia
EIA DRAFT MAIN REPORT.pdf - Enviro Dynamics Namibia
Groud Water Impact Assessment - Enviro Dynamics Namibia
Wetland & Fish Ecology - Enviro Dynamics Namibia
Hydrology and Flood Evaluation - Enviro Dynamics Namibia
Final Environmental Scoping Report MTC.docx - Enviro Dynamics ...
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mitations Impacting Environmental Assessments