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March 23, 2005 Page 7 route. The September and October Monday single stream pilot route results were quite similar, with no significant difference between confidence intervals. Because the comparison of the "before' pilot Monday routes to the "during' pilot Monday routes reflected statistically significant differences for each of the categories, we calculated estimated quantities of materials. Table 6 shows the matelial compositions by weight, derived from applying the median percentages for each material category obtained from the recyclable material sorting events to the average of the pilot route truck weights for each of the Monday routes. Table 6 Comparison of Material Compositions by Weight1 Monday Routes Weight (Pounds) July September October Material Category (Dual Stream) (Single Stream) (Single Stream) Paper 3,879 9,165 9,327 Metals 529 326 291 Glass 1,320 617 690 Plastic 717 699 594 Contaminants 261 827 1,199 Total' 6,707 11,633 12,101 1 The weights were estimated by applying the median percentages from the sorting events to the average of the pilot route truck tonnages. 2 The totals are based on the average of two pilot routes for each month. The results of comparing the material compositions by weight for the Monday collection routes include: . The quantities of paper collected via the single stream method (September and October) increased compared to the quantities collected via the dual stream method (July). . The quantities of metals, glass, and plastic decreased with the single stream collection method. . The amount of contaminants collected via the single stream method was higher than the dual stream method. No conclusions are drawn as to the magnitude of the differences by weight because the weights represent only the median percentages. OJ -00253-1 0 1 0 1-01 01 I 070001 I 13500 P:\13500 Ramsey Co. 2003\RT A \Roseville\F A \B 1544 - Final Data Analysis