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

113August 2010 8848It is understood that extension is planned towards the north and north east, therefore it willbe necessary to line the footprint unless the extent of the clay layer is confirmed by test pitsand mappingWith respect to closure, from the groundwater perspective, it is important to minimizeseepage from the waste disposal site and, accordingly, ponding and infiltration of rain watermust be minimized by either:• landscaping (final shape and topography of the site), and / or• capping (prevention of infiltration from the surface), and / or• grassing (to limit infiltration and minimise erosion of the final shape of the site).Residual ImpactThe residual impact with the successful implementation of the mitigation measuresmentioned above will be slightly less significant as the probability reduces and therefore be alow impact.Table 36: Impact Rating Matrix for groundwater during the operational phase(Alternative 1-3).Type of Significance Spatial Temporal Probability RatingImpactInitial MODERATE Study site Permanent Could happen 2.1- ModerateAdditional MODERATE Study site Permanent Could happen 2.1- ModerateCumulative MODERATE Study site Permanent Could happen 2.1- ModerateResidual MODERATE Study site Permanent Unlikely 1.3- Low11.2.4 Surface WaterInitial ImpactThe initial impact will remain as assessed in the construction phase, Section 11.1.4, as aModerate impact.Additional ImpactDuring the operational phase if waste is not covered on a daily basis windblown litter anddust will be blown into the vlei to the north of the site, as currently experienced with theexisting site (Figure 30). Additionally if the mitigation measures proposed in the constructionphase are not implemented run-off from the waste body will potentially polluted all surfacewater bodies downstream of the site. Therefore the impact is rated as HIGH significance,locally in the short-term and is therefore a Moderate impact.ZITHOLELE CONSULTING