2005-07-26_PWETC_AgendaPacket - Laserfiche WebLink

Home

March 23, 2005 Page 12 Comparison of the Current Dual Stream Bi-Weekly Method to the Dual Stream Weekly Method Residents in the Tuesday pilot area were able to set out their 18-gallon bin weekly rather than every other week. The comparative results are shown below in Table 12. Table 12 Comparison of Dual Stream Routes During Pilot Weekly vs. Bi-weekly Collection Tuesday (Weekly) Route' Friday (Bi-weekly) Route' (Control) Statistically 90% Confidence 90% Confidence Significant Interval Interval Difference Material Category Mean Lower Upper Mean Lower Upper 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% Glass 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% Total' 100% nla nla 100% nla nla 1 Three samples were sorted from the Tuesday routes. 2 Three samples were sorted from the Friday roules. 3The 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 (bi-weekly) September (weekly) October (weekly) Total Quantities Collected (Tons) 8,150 5,650 4,925 01-00253-10 I 0 1-01 0 I I 070001 I 13500 P:\13500 Ramsey Co. 2003\RT A \Roseville\F A \B 1544 - Final Data Analysis