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March 23, 2005 Page 13 It appears that on a montWy 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. Comparison of the Current Dual Stream Bi-Weekly Method to the Dual Stream Bi-Weekly Method with Additional Education The residents in the Wednesday pilot area received additional recycling educational materials while their collection method (dual stream) and frequency (bi-weekly) remained unchanged. The results are reflected below in Table 14. Table 14 Comparison of Dual Stream Routes During Pilot Bi-Weekly with Additional Education vs. Bi-Weekly Control Wednesday (Addt'l Educ) Route' Friday (Control) Route' 90% Confidence 90% Confidence Statistically Interval Interval Significant Material Difference Category Mean Lower Upper Mean Lower Upper Paper 56.4% 53.4% 59.5% 59,5% 53.9% 65,1% Metals 8.9% 7,8% 10,0% 6.7% 6,0% 7,5% Glass 18.3% 14.7% 21.8% 22.2% 14.5% 29.8% Plastic 12,3% 9.5% 15.1% 8,6% 6,3% 10.9% Contaminants 4.1% 3.8% 4.4% 3.0% 2,5% 3,5% Total' 100% nla nla 100% nla nla 1 Three samples were sorted from the Wednesday routes. 2Three samples were sorted from the Friday routes. 3 The totals may not equal the sum of the material categories due to rounding. As shown in Table 14, the upper and lower confidence intervals of the bi-weekly, dual stream with additional education 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 15 below reflects the weights of the quantities collected for each route. 01-00253-10 10 1-0 1 0 I I 07000 I I 13500 P:\13500 Ramsey Co. 2003\RT A \Roseville\F A \B 1544 . Final Data Analysis