2013-01-22_PWETC_AgendaPacket - Laserfiche WebLink

Home

Data Analysis of City of Roseville Recyclable Materials ■ The amount of contaminants collected via the single stream method was higher than the dual stream method. Comparison of Single Stream and Dual Stream Collection Methods The upper and lower confidence intervals of the September and October Monday single stream pilot routes were significantly different than the September and October dual stream routes. The results of comparing the single stream and dual stream collection methods in September and October include: • The single stream routes yielded increased quantities of paper compared to the dual stream routes; • The single stream routes generated less quantities of metals, glass and plastics than the dual stream routes; and • The quantities of contaminants in the single stream routes were higher than the quantities of contaminants found in the dual stream routes. On average, the quantities collected during the pilot from single stream collection routes were greater than from dual stream routes. However, more data sets are needed to draw definitive conclusions. Comparison of the Current Dual Stream Bi- Weekly Method to the Dual Stream Weekly Method The upper and lower confidence intervals of the weekly dual stream collection routes were not significantly different than the bi- weekly dual stream (control) routes. Thus, the materials composition is projected to remain similar. It appears on a monthly basis that greater quantities of materials are likely to be collected with weekly collection as compared to bi- weekly collection. However, more data sets are needed to draw definitive conclusions. Comparison of the Current Dual Stream Bi- Weekly Method to the Dual Stream Bi- Weekly Method with Additional Education 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 materials composition is projected to remain similar. It appears that additional data sets are needed to draw any definitive conclusions as it relates to quantities set out for collection using the two approaches. B1605 13-17