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Orange County <br />Waste Composition Study <br />Section 2: Methodology <br />5 <br />Orange County/Report/Final Report <br />All samples were hand-sorted into the previously defined material categories. After the entire <br />sample was sorted, one of the KCI supervisors weighed and recorded the net weights of each <br />material category on a data recording form. <br />The same protocol was followed for both sorting events. <br />2.5 Analytical Procedures <br />After fieldwork was completed, KCI calculated the two-season combined, weighted average of each <br />material category for each generator sector and each jurisdiction. Data analysis followed industry- <br />accepted standards for statistical sampling, as outlined in the ASTM Standard Test Method for <br />Determination of the Composition of Unprocessed Municipal Solid Waste (D5231-92; reapproved <br />2008). Where appropriate, 90 percent confidence intervals were calculated, using a standard <br />statistical t-test, for each material category. <br />Utilizing data provided by the County, KCI was able to determine amount of MSW generated from <br />each of the generator sectors in the County. Based on this data, KCI determined that <br />approximately 46 percent of the annual waste stream is from the single-family residential sector, <br />while 14 and 40 percent are from the multi-family residential and commercial sectors, respectively. <br />To determine annual composition for each generator sector and each jurisdiction, the individual <br />samples from each sorting event were averaged together, weighted by sample size. <br />The aggregated countywide data was calculated by multiplying the average composition of each <br />sector by the percent of total generated tonnage estimated for each sector. The aggregated <br />countywide data is hereafter referred to as the Aggregate MSW stream. <br /> <br />DocuSign Envelope ID: 00C54720-9DC0-4A3D-ABED-77E0FD28E0CD