1.2 Purpose of this waste assessment - Waikato District Council

4.4 Methodology for estimating waste tonnages andcompositionThe estimate of waste to landfill from the Waikato district has been calculated using the following types ofinformation:1) Data provided by the council for 2009 on:a. Tonnage to landfill from the three transfer stations in the districtb. Tonnage to landfill from the council’s kerbside collectionsc. Tonnage to landfill from the council’s inorganic collection2) Statistics NZ sub-national population projections for 20093) Per capita waste generation figures from previous research conducted by Waste Not Consulting4) Composition of various waste streams as determined by previous surveys conducted by Waste NotConsulting5) Collection tonnage data provided by EnviroWaste Services Ltd and Transpacific Industries Group(NZ) LtdFor an overall estimate of waste to landfill to be made, separate estimates of waste tonnage and compositionwere made for:1) Five domestic kerbside refuse streams:a. Council refuse bags from the Waikato district, excluding Raglanb. Council refuse bags from Raglanc. Private wheelie bins from the Waikato districtd. Franklin District Council Tuakau MGBse. Franklin District Council refuse bags from the remainder of the area to be annexed to Waikato district2) Waikato District Council’s inorganic collection3) Huntly and Te Kauwhata transfer stations4) Raglan transfer station ‘general waste’ ie excluding council refuse bags5) Refuse from the former Franklin district taken to Pukekohe transfer station and from the Ngaruawahiaarea to Hamilton transfer stations6) Refuse taken directly to landfill by commercial waste operatorsTonnage and composition estimates for each of these waste streams are presented in section 4.2.3. Theestimate of the overall waste stream is presented in section 4.2.1. Waste streams that are not included in theestimate are discussed in section 4.1.Each waste stream is discussed below in more detail.4.4.1 Kerbside refuse collectionsThe composition and tonnage of kerbside refuse in post-1 November Waikato district has been estimated byseparately analysing five separate kerbside refuse streams and applying an assumed composition to each.The five kerbside refuse streams, and the assumptions that have been made relating to each, are:1) Waikato District Council refuse bags – excluding Raglan – As this refuse is disposed of directly toHampton Downs landfill, tonnage information is available. The composition is assumed to be thesame as for Franklin District Council refuse bags, which has been measured previously by Waste NotConsulting.Waikato District Council waste assessment 201131