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Appendix A City of Roseville Analysis of Processing Residuals The project team of R. W. Beck and Dan Krivit and Associates (Project Team) completed a "desk -top" analysis of residuals as produced from the Waste Management, Inc. (WM) materials recovery facility (MRF) in Minneapolis in relation to the City of Roseville's (City) curbside recycling pilot collection study. This analysis of processing residuals is the Project Teams' analysis of available data on the issue of processing residuals given that there were no independent measurements of outputs from the WM Minneapolis MRF. This analysis is divided into the following sections • Background/Problem Statement • Available Data from the City of Roseville Pilot Project • Summary of WM Study at its Minneapolis MRF • Other Available Data • Policy Implications • Recommendations for Additional Study • Bibliography of References Cited • Attachment A -1 — Primer on Definitions • Attachment A -2 — Additional Discussion of the WM Study at its Minneapolis MRF • Attachment A -3 — Excerpts from the City of Shoreview Recycling Contract: Processing Residuals Requirements Background Many communities are considering changing their recycling programs to single - stream systems. The City of Roseville conducted a pilot collection study in 2004 to test the residents' response to a variety of collection design changes, including two pilot routes testing single- stream recycling. One of the key components in quantifying the overall impacts of collection design choices is the need to estimate the change in "processing residuals from the MRF" as one indicator of environmental impacts. Changing a collection design impacts many system variables: ■ Overall participation may increase or decrease due to increased convenience (e.g., less sorting, wheeled carts); B1605