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Appendix B Table 12 Comparison of Dual Stream Routes During Pilot Weekly vs. Bi- weekly Collection nree samples were sorted trom the I uesday routes. %Three samples were sorted from the Friday routes. J The totals may not equal the sum of the material categories due to rounding. As shown in Table 12, the upper and lower confidence intervals for each of the material categories of the weekly dual stream collection routes were not significantly different than the bi- weekly dual stream (control) routes. Thus, the composition of the materials collected did not significantly change. As for the quantities of materials collected, Table 13 below reflects the weights of the quantities collected for each route. Table 13 Comparison of Dual Stream Bi- Weekly vs. Weekly Collection (Tuesday) Total Quantities Collected by Route Before and During Pilot July September October (bi- weekly) (weekly) (weekly) Total Quantities Collected (Tons) 8,150 5,650 4,925 It appears that on a monthly basis, the weekly collection would result in greater quantities collected than bi- weekly collection. However, because the data set is limited, we cannot draw a definitive conclusion without additional pilot data B-12 B1605 Tuesday (Weekly) Route' Friday (Bi- weekly) Routez (Control) Statistically 90% Confidence 90% Confidence Significant Material Interval Interval Difference Lower Upper Lower Upper Category Mean Mean Paper 65.4% 62.5% 68.3% 59.5% 53.9% 65.1% Metals 7.4% 5.8% 9.0% 6.7% 6.0% 7.5% (lass 13.6% 8.3% 19.0% 22.2% 14.5% 29.8% Plastic 9.9% 7.7% 12.0% 8.6% 6.3% 10.9% Contaminants 3.7% 2.6% 4.9% 3.0% 2.5% 3.5% Total3 100% n/a n/a 100% n/a n/a nree samples were sorted trom the I uesday routes. %Three samples were sorted from the Friday routes. J The totals may not equal the sum of the material categories due to rounding. As shown in Table 12, the upper and lower confidence intervals for each of the material categories of the weekly dual stream collection routes were not significantly different than the bi- weekly dual stream (control) routes. Thus, the composition of the materials collected did not significantly change. As for the quantities of materials collected, Table 13 below reflects the weights of the quantities collected for each route. Table 13 Comparison of Dual Stream Bi- Weekly vs. Weekly Collection (Tuesday) Total Quantities Collected by Route Before and During Pilot July September October (bi- weekly) (weekly) (weekly) Total Quantities Collected (Tons) 8,150 5,650 4,925 It appears that on a monthly basis, the weekly collection would result in greater quantities collected than bi- weekly collection. However, because the data set is limited, we cannot draw a definitive conclusion without additional pilot data B-12 B1605