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March 23, 2005 Page 14 Table 15 Comparison of Dual Stream Bi-Weekly with Additional Education (Wed) vs. Bi-Weekly Control (Friday) Total Quantities Collected by Route During Pilot Septem ber October Mean Standard Deviation Wednesday (Addt'l Educ) 9,625 7,975 8,800 1,167 Friday (Control) 10,825 8,075 9,450 1,945 Comparison of the Current Dual Stream Bi-Weekly Method to the Dual Stream Bi-Weekly Method with Larger Bins The residents in the Thursday pilot area received larger curbside recycling bins (22-gallon capacity compared to the original IS-gallon capacity bins). The new bins were also equipped with wheels. The collection method (dual stream) and frequency (bi-weekly) remained unchanged. The results are reflected below in Table 16. Table 16 Comparison of Dual Stream Routes During Pilot Bi-Weekly with Larger Bins vs. Bi-Weekly Control Thursday (Larger Bins) Friday (Bi-weekly) Route' Route' (Control) 90% Confidence 90% Confidence Statistically Significant Interval Interval Difference Material Mean Lower Upper Mean Lower Upper Category Paper 63.7% 53.8% 73.7% 59.5% 53.9% 65.1% Metals 5.8% 5.0% 6.6% 6.7% 6.0% 7.5% Glass 19.1% 12.6% 25.7% 22.2% 14.5% 29.8% Plastic 8.1% 4.8% 11.3% 8.6% 6.3% 10.9% Contaminants 3.3% 2.0% 4.5% 3.0% 2.5% 3.5% Total' 100% nfa nfa 100% nfa nfa 1 Four samples were sorted from the Thursday route. 2Three samples were sorted from the Friday route. 3The totals may not equal the sum of the material categories due to rounding. As shown in Table 16, the upper and lower confidence intervals of the bi-weekly, dual stream with larger bins were not significantly different than the bi-weekly dual stream (control) routes. 01-00253-10101-0101 1070001 I 13500 P:\13500 Ramsey Co. 2003\RTA \Roseville\F A\B1544. Final Data Analysis