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SECTION 1 INTRODUCTION <br />EXHIBIT 1 -2 <br />Number of Samples, Total and Average Sample Weight <br />1.2.2 Calculations <br />A weighted averaging process was used to prepare the waste composition estimates in <br />which composition percentages from substreams were multiplied by FY 2008 tons from that <br />substream. The result is FY 2008 tons for each waste component in each substream. <br />Exhibit 1 -3 presents a flow chart that summarizes the calculation process for the waste <br />composition estimates. For West Hawai i, composition estimates were calculated for the <br />sample groups, the three substreams, and the overall waste stream using the linked <br />procedure shown. For the transfer station substream, composition percentages were <br />calculated for each of the nine transfer stations. Sample loads that came from each of the <br />nine stations determined these composition percentages. The percentages were weighted <br />according to the tons disposed by each station during FY 2008, and then pooled to produce <br />an overall transfer station compositions. <br />For the commercial haulers, separate composition percentages were calculated for three <br />vehicle types: packer, roll -off, and other vehicles. These percentages were weighted <br />according to the estimated tons disposed by each vehicle type during FY 2008. They were <br />then combined to give composition percentages for the commercial substream. <br />For waste from East Hawaii delivered to the South Hilo Landfill, the waste quantities by <br />component were determined by multiplying the 2001 waste composition percentages by <br />FY 2008 deliveries from each substream (transfer stations, commercial loads, and self -haul <br />loads. As described above, pure loads delivered to the South Hilo Landfill were assigned to <br />specific waste components. <br />The overall waste stream composition for West Hawaii and East Hawaii was calculated as <br />an aggregate of the sample group compositions, which were weighted according to their <br />tonnage contribution to the overall waste stream. Finally, a similar process is used to <br />combine results from West Hawai'i and East Hawaii into a total county waste composition <br />profile. <br />5 Tonnages from the West Hawaii Landfill and the South Hilo Landfill provided all tonnages used to "weight' each sample <br />group for this study. The weighting process is described in Attachment C. <br />1 -4 APPX B WASTE COMPOSITION REPORT 121709.DOC <br />Sample Count <br />Sample Weights <br />(in pounds) <br />Total for All Samples <br />Average <br />Transfer Station <br />30 <br />6,986 <br />232.9 <br />Commercial Packer <br />30 <br />6,724 <br />224.1 <br />Commercial Drop Box <br />30 <br />6,902 <br />230.1 <br />Commercial Other <br />10 <br />2,376 <br />237.6 <br />Total <br />100 <br />22,988 <br />231.2 <br />1.2.2 Calculations <br />A weighted averaging process was used to prepare the waste composition estimates in <br />which composition percentages from substreams were multiplied by FY 2008 tons from that <br />substream. The result is FY 2008 tons for each waste component in each substream. <br />Exhibit 1 -3 presents a flow chart that summarizes the calculation process for the waste <br />composition estimates. For West Hawai i, composition estimates were calculated for the <br />sample groups, the three substreams, and the overall waste stream using the linked <br />procedure shown. For the transfer station substream, composition percentages were <br />calculated for each of the nine transfer stations. Sample loads that came from each of the <br />nine stations determined these composition percentages. The percentages were weighted <br />according to the tons disposed by each station during FY 2008, and then pooled to produce <br />an overall transfer station compositions. <br />For the commercial haulers, separate composition percentages were calculated for three <br />vehicle types: packer, roll -off, and other vehicles. These percentages were weighted <br />according to the estimated tons disposed by each vehicle type during FY 2008. They were <br />then combined to give composition percentages for the commercial substream. <br />For waste from East Hawaii delivered to the South Hilo Landfill, the waste quantities by <br />component were determined by multiplying the 2001 waste composition percentages by <br />FY 2008 deliveries from each substream (transfer stations, commercial loads, and self -haul <br />loads. As described above, pure loads delivered to the South Hilo Landfill were assigned to <br />specific waste components. <br />The overall waste stream composition for West Hawaii and East Hawaii was calculated as <br />an aggregate of the sample group compositions, which were weighted according to their <br />tonnage contribution to the overall waste stream. Finally, a similar process is used to <br />combine results from West Hawai'i and East Hawaii into a total county waste composition <br />profile. <br />5 Tonnages from the West Hawaii Landfill and the South Hilo Landfill provided all tonnages used to "weight' each sample <br />group for this study. The weighting process is described in Attachment C. <br />1 -4 APPX B WASTE COMPOSITION REPORT 121709.DOC <br />