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in June and highest in October. The original <br />characterization study was performed primarily during the <br />month of June, 1990. Therefore, a partial sampling was <br />performed in the month of October, the highest quantity <br />month, and the beginning of the winter season. <br />The seasonal sampling was performed using the same <br />methodology used in the initial study. However, only <br />seven samples were obtained from each of the four waste <br />sources - Residential, Self -Haul, commercial, and <br />Industrial. These samples were sorted into the <br />appropriate waste types and categories, weighed, and the <br />results recorded in a table. <br />Mean percentages and standard deviations were <br />calculated for each waste type and category. The results <br />of the seasonal sampling were then compared with the <br />original study, using a Student's t test analysis, at the <br />90% level of confidence. A value of t was calculated and <br />compared with a critical value of t, for a two tailed <br />test, obtained from a table of Student t distribution <br />values. If t calculated was within the range of +- t <br />critical, then the differences were not statistically <br />significant at a 90% confidence level. <br />The analysis revealed that although the percentages <br />for waste types and categories were different between the <br />two studies, the differences were not significant for <br />most categories of waste. Rather than reproducing the <br />statistical tables, only the waste types that were <br />significantly different were listed in Table A 1-3. <br />Appendix 1 12 <br />