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2013-01-22_PWETC_AgendaPacket
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2013-01-22_PWETC_AgendaPacket
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Public Works Commission
Commission/Committee - Document Type
Agenda/Packet
Commission/Committee - Meeting Date
1/22/2013
Commission/Committee - Meeting Type
Regular
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Attachment A -2 <br />Additional Discussion of the WM Study at its <br />Minneapolis MRF <br />Waste Management, Inc (WM) conducted a composition analysis at its Twin Cities <br />Material Recovery Facility (MRF) located in Minneapolis. The study is entitled, <br />Summary - Single -Sort Constituent Test, is dated October 18, 2003, and was provided <br />to the Project Team. <br />Purpose of Study - The report provides summary information resulting from the <br />sorting and analyses performed by WM at their Twin Cities MRF. The purpose for <br />the test was to determine the resulting material constituents resulting from single -sort <br />collection and processing. <br />Methodology - Single stream recyclables loads from fourteen (14) WM trucks from <br />nine (9) different cities were stockpiled for the test on Friday, October 17, 2003. The <br />total stockpile was 74.907 tons. The single stream recycling collection systems <br />utilized the standard WM lidded carts. Recyclables were loaded into the truck using <br />semi - automated or fully automated collection vehicles. The WM report states they ran <br />the test on Saturday, October 18, 2003 as a single test batch, but using normal <br />operating procedures for their Twin Cities MRF. Processed materials and residuals <br />were collected and weighed to determine make -up. Operations and data collection <br />were witnessed by Mr. Dave Kohorst, Financial Analyst, acting in an accounting role <br />for the tabulation of data. <br />Findings - WM reported that the resulting "Residue Fraction of Processed Materials" <br />from this test as 5.95 percent. The WM Twin Cities MRF is comprised of two <br />sequential processing systems: the "single stream process system" (i.e., screens and <br />sorting stations to recover paper) and "containers process system" to recover glass, <br />cans and plastic products. The residue is derived from unrecoverable materials sorted <br />from both systems, including bulky items, air classifier cyclone "fluff', unmarketable <br />grit, and other trash. It also included floor sweepings. <br />WM stated that unrecoverable materials were defined as materials not targeted for <br />recycling at the Twin Cities MRF. These materials were comprised largely of plastic <br />bags, bulky items and materials incorrectly placed in the recycling cart rather than the <br />trash container by the resident. The WM study categorized these items as "residue" <br />from plant operations, but should be better termed as "unrecoverable." <br />The WM report provided a separate breakdown of products and process residue from <br />both the single stream process system (i.e., "paper line ") and the container process <br />system ( "paper line "). Paper products represented 74 percent of the total input and the <br />paper line produced about two percent residue of total input. Container products <br />represented 21 percent of the total input and the container line produced about four <br />percent residue of total input. (Approximations do not add to 100 percent due to <br />Project Team rounding.) Color- mixed, broken glass was defined as a product by the <br />B1605 <br />
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