Appendices to Integrated Resources & Solid Waste Management Plan - Dec 2009

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SECTION 1 INTRODUCTION the total waste stream, with one exception. There is relatively little mixed self -haul material delivered to the West Hawaii Landfill (1,200 of 128,000 tons in FY 2008, or less than 1 percent). Therefore, it was decided that overall sampling accuracy would be improved by using self -haul sampling results from the 2001 study to represent the composition of mixed self -haul loads in West Hawai i, and assigning samples that would have been obtained from the self -haul stream to the other two substreams. The composition profile of mixed self -haul loads from the 2001 study was used to estimate the mixed self -haul composition for the West Hawaii Landfill. In addition to the mixed self -haul loads delivered to the West Hawaii Landfill, there were about 4,700 tons of pure loads i.e., loads that could be assigned to a single waste component such as confidential documents or tires (or in the case of construction and demolition debris, assigned to a subset of the waste stream). The 2001 composition profile was applied only to the mixed self -haul loads: the pure loads were added to the mixed load profile resulting in a total self -haul profile. Finally, adjustments were made so that a sufficient number of samples were taken from each substream and vehicle type to assure that sample data are representative of composition. The commercial substream was oversampled to account for the increased variability typically encountered in that substream. Exhibit 1 -1 presents the number of samples taken per day. EXHIBIT 1 -1 Samples per Dav by Substream and Vehicle Tvpe All loads were systematically selected for sampling4. From each selected load, a 200- to 300 -pound representative sample was hand - sorted into 58 prescribed component material categories, which were then weighed and recorded. Evidence of explosive or hard -to- process items was noted for each load. A listing and description of the component material categories is included in Attachment C. Exhibit 1 -2 summarizes the number of samples and the total and average sample weight. 4 Systematic sampling is outlined in more detail in Attachment B. In short, this procedure assures that the correct number of samples is taken randomly and throughout the day by selecting every "nth" vehicle from each substream (i.e. every 4th commercial packer truck). APPX B WASTE COMPOSITION REPORT 121709.DOC 1 -3 Transfer Station Commercial Packer Number of Samples Commercial Commercial Rolloff Other Total May 15, 2008 6 5 6 3 20 May 16, 2008 6 8 5 1 20 May 19, 2008 6 7 6 1 20 May 20, 2008 6 4 9 1 20 May 21, 2008 6 6 4 4 20 Total 30 30 30 10 100 All loads were systematically selected for sampling4. From each selected load, a 200- to 300 -pound representative sample was hand - sorted into 58 prescribed component material categories, which were then weighed and recorded. Evidence of explosive or hard -to- process items was noted for each load. A listing and description of the component material categories is included in Attachment C. Exhibit 1 -2 summarizes the number of samples and the total and average sample weight. 4 Systematic sampling is outlined in more detail in Attachment B. In short, this procedure assures that the correct number of samples is taken randomly and throughout the day by selecting every "nth" vehicle from each substream (i.e. every 4th commercial packer truck). APPX B WASTE COMPOSITION REPORT 121709.DOC 1 -3