2005 Recycling Pilot Program Report

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March 23, zoas Page 12 Comparison of the Currenf Dual Stream Bi-INeek�y Method to the Dual Stream Vlfeekly Methvd Residents in the Tuesday pi�ot area were able to set out their 18-gallon bin weekly rather iiian every other week. The comparative results aze shown below in Tabl.e 12. Materiai Category Table 12 Comparison of Dual SEream Routes buring Pilot Weekly vs. Bi-weekly Collection Tuesday (Weekiyj Route' Friday (Bi-week{y) Routez (Control) 90% Confidence 90% Confidence fnterval Interval Mean �ower lJpper Mean Paper 65.4% 62.5% 68_3% 59.5% Metals 7.4% 5.8% 9.a% 6.7% Glass 13.6% 6.3% 19.0% 222% Plastic 9.9% 7.7% 12.0% 8.6% Contaminants 3.7% 2.6% 4.9% 3.0% Total3 100% nla n!a 100% + 1'hree samples were sorted from the Tuesday routes. 27hree samples were soried from the Friday routes. 3 The lotals may not equa! the sum af the materiat categories due to rounding. Lower 53.9% 6.0% 14.5% 6.3% 2.5% n!a Upper 65.1 % 7.5% 29.8% �a.s�io 3.5% nla Statisticafly Significant Difference As shown in Table 12, the upper and lower confidence intervals for each of the material categories of the weekly dual stream col.lection routes were not sign�i.ficantly different than the bi-weekly dual stream (control) routes. Thus, the coFnposition of the materials collected did not significantly chax�ge_ As for the quantities of materials collected, Table 13 below reflects the weights of the quantities collected for each route. Table 13 Comparison of Qual Stream Bi-Weekly vs. Weekly Collection (7uesdayj Total Quar�tities Collected by Route Before and During Pilot July Septe�nber October (bi-weeklyj (weeklyj (weekly} Total Quanfities Collected (Tons) 8,150 5,650 4,925 O1-00253-10101-0101 � 070001 . 13500 P:\13500 Ramsey Co. 2003�RTA112osevi11e1FA1B1544 - Final Data Analysis