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

92August 2010 8848Additional ImpactThe site preparation and liner construction activities will involve the use of earth movingequipment and vehicles to strip the topsoil, excavate the clay to be used for lining material,shape and profile the site to achieve the required drainage of leachate from the individualcells to the leachate ponds and to install the storm water control systems and otherinfrastructure. Such activities have the potential for the contamination of the soil with fuels,lubricants and hydraulic fluids from the machinery and from cement during the constructionof the infrastructure, but would not compromise use of the aquifer, since there are no knowngroundwater users within proposed site. All seven boreholes where analysed, and however,the water quality in Borehole B4A is poor with Manganese.During the construction phase, the additional impact will remain of MODERATE significanceimpacting at isolated sites in the short term and could occur, and will therefore result in aLow impact.Cumulative ImpactThe cumulative impact during the construction phase remains as assessed above since theadditional impact and the initial impact occur in the same area. Therefore the impact remainsas Moderate impact.Mitigation MeasuresMitigation measures include the refuelling of vehicles off-site, servicing them in properlyequipped workshops, placing drip trays under parked vehicles, cleaning up any spillsimmediately, discharging water from cleaning of cement mixing equipment to sewer, andexcavating any contaminated soil immediately, followed by proper disposal at a licensed site.Residual ImpactThe residual impact will be reduced if proper mitigation measures are followed. The impactwill be reduced from MODERATE to LOW.The table below provides a summary of groundwater impact during the construction phase.Table 26: Impact Rating Matrix for groundwater during the construction phase(Alternative 1-3).Type of Significance Spatial Temporal Probability RatingImpactInitial MODERATE Study area Long Term Very Likely2.4 –ModerateAdditional MODERATE Isolated sites Short Term Could occur 1.2 LowCumulative MODERATE Study area Long Term Very Likely2.4 –ModerateResidual MODERATE Isolated SitesShort –TermCould Occur 1.2- LowZITHOLELE CONSULTING