Noise and Vibration Report - Transnet

ENVIRO-ACOUSTIC RESEARCHSCOPING NOISE REPORT – TRANSNET: SWAZI RAIL LINK – DAVEL YARD TO NERSTON RSA ROUTETable 6.4: Impact Assessment Criteria – Spatial extentClassification of the physical and spatial scale of the impactRating Description ScoreSiteThe impacted area extends only as far as the activity, such as footprint occurringwithin the total site area.Local The impact could affect the local area (within 1,000 m from site). 2RegionalThe impact could affect the area including the neighbouring farms, the transportroutes and the adjoining towns.National The impact could have an effect that expands throughout the country (South Africa). 4InternationalWhere the impact has international ramifications that extend beyond the boundariesof South Africa.135Table 6.5: Impact Assessment Criteria - ProbabilityThis describes the likelihood of the impacts actually occurring, and whether it will impact on anidentified receptor. The impact may occur for any length of time during the life cycle of the activity,and not at any given time. The classes are rated as follows:Rating Description ScoreImprobablePossibleLikelyHighlyLikelyDefiniteThe possibility of the impact occurring is none, due either to the circumstances,design or experience. The chance of this impact occurring is zero (0 %).The possibility of the impact occurring is very low, due either to the circumstances,design or experience. The chances of this impact occurring is defined to be up to 25%.There is a possibility that the impact will occur to the extent that provisions musttherefore be made. The chances of this impact occurring is defined to be between25% and 50 %.It is most likely that the impacts will occur at some stage of the development. Plansmust be drawn up before carrying out the activity. The chances of this impactoccurring is defined to be between 50 % to 75 %.The impact will take place regardless of any prevention plans, and only mitigationactions or contingency plans to contain the effect can be relied on. The chance of thisimpact occurring is defined to be between 75% and 100 %.123456.3.4 Identifying the Potential Impacts without Mitigation Measures (WOM)Following the assignment of the necessary weights to the respective aspects, criteria aresummed and multiplied by their assigned probabilities, resulting in a Significance Rating(SR) value for each impact (prior to the implementation of mitigation measures).Significance without mitigation is rated on the following scale:SR