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FEIR for Boitshepi Landfill Site .pdf - Zitholele.co.za

FEIR for Boitshepi Landfill Site .pdf - Zitholele.co.za

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83August 2010 884810.3 Duration ScaleIn order to accurately describe the impact it is necessary to understand the duration andpersistence of an impact in the environment. The temporal scale is rated ac<strong>co</strong>rding tocriteria set out in Table 17.Table 17: Description of the Temporal Rating Scale.RatingDescription1 Incidental The impact will be limited to isolated incidences that are expected tooccur very sporadically.2 Short-term The environmental impact identified will operate <strong>for</strong> the duration of the<strong>co</strong>nstruction phase or a period of less than 5 years, whichever is thegreater.3 Medium term The environmental impact identified will operate <strong>for</strong> the duration of lifeof the waste disposal site.4 Long term The environmental impact identified will operate beyond the life ofoperation.5 Permanent The environmental impact will be permanent.10.4 Degree of ProbabilityProbability or likelihood of an impact occurring will be described as shown in Table 18 below.Table 18: Description of the Degree of Probability of an Impact occurring.RatingDescription1 Practically impossible2 Unlikely3 Could happen4 Very Likely5 It’s going to happen / has occurred10.5 Degree of CertaintyAs with all studies it is not possible to be 100% certain of all facts, and <strong>for</strong> this reason astandard “degree of certainty” scale is used as discussed in Table 19. The level of detail <strong>for</strong>Specialist Studies is determined ac<strong>co</strong>rding to the degree of certainty required <strong>for</strong> decisionmaking.The impacts are discussed in terms of affected parties or environmental<strong>co</strong>mponents.RatingDefiniteProbablePossibleUnsureCan’t knowTable 19: Description of the Degree of Certainty Rating Scale.DescriptionMore than 90% sure of a particular fact.Between 70 and 90% sure of a particular fact, or of the likelihood of that impactoccurring.Between 40 and 70% sure of a particular fact, or of the likelihood of an impactoccurring.Less than 40% sure of a particular fact or the likelihood of an impact occurring.The <strong>co</strong>nsultant believes an assessment is not possible even with additional research.ZITHOLELE CONSULTING

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