Wambo Coal AEMR 2010-2011 - Peabody Energy

2010-2011 AEMRNETD Rehabilitation works using low press groundequipmentPlacement of the initial rejects layer has continuedwith additional small dozers sourced. Progress hasbeen slow due to the weak surface with the crust rewettingas the equipment traverses, however arepeatable process has now been demonstratedand productivity is improvingDuring the reporting period, heavy rain in early June2011 caused major ponds to form on the damsurface which suspended work activity. Pumpingcontinued throughout the month with the majority ofwater removed. As a result of the water on thesurface no placement of fabric or rejects occurredduring the month, it is anticipated access will beregained in early July 2011.Approximately 55% of the dam surface is coveredwith a layer of rejects. The target is to completerejects placement on 100% of the dam by the end of2011. The design Consultants ATC Williams visitedsite this month to review progress. Whilst there wasno activity on the dam, it was recommended workproceed as soon as the surface was accessible.NETD Rehabilitation works in progress5.1.2 Rail LineRehabilitation was progressively completed on theWambo Rail Development (WRD) following thecompletion of construction activities. The primaryaims of this rehabilitation was to allow theregeneration of native flora species on the site,maintain the structural stability of the land, preventerosion and sedimentation, and provide naturalscreening, where possible, to maintain the visualamenity of the WRD.During the reporting period, Wambo engaged theservices of a horticulturist to complete anassessment of a section of tree screen along theWRD. As a result of the tree screen assessment,WCPL completed a number of therecommendations, including additional 500 treeplantings, weed control and protective signage.Monthly follow up inspections after the works notedapproximately 70% of the newly planted trees hadsurvived.NETD Rehabilitation Status as of June 2010Continued monitoring of the rehabilitation and treemaintenance works will continue throughout 2011-2012 reporting period.5.1.3 NWC DiversionFollowing Stage 2 completion of the NWC Diversionconstruction works, all disturbed areas wererehabilitated in 2008/2009. Rehabilitation consistedgenerally of topsoil application, application of soilameliorants, ripping, seeding (mainly a pastureseedmix), and strategic tubestock planting toprovide long-term bank stabilisation. Revegetationusing hydromulching was also undertaken onsteeper batters.NETD Rehabilitation Status as of June 2011Following the first two flows, or discharges, throughStage 2 of the NWC Diversion in February and April2009, an assessment of diversion condition andbank stability was undertaken. The diversion wasinspected by the hydrological consultants whoPage 85