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Program DetniL~ nnd S~lection Rnfionnle Program Administration Recommendation: .San Mateo County Department of Public Works, Waste .Management Division · ;' Bin Selection " Bin Recommendation: The Biostack Composter manufactured by Smiih & Hawken' '. The Biostack Composter consists of three bottomless tiers stacked on top of each other and a hinged lid. The basic 'bin size 0 tiers) is. 13 cubic feet. Additional tiers can be added; each additional tier adds 4.2 cubic feet. It's made of 60% .reCycled polyethylene. Selection Rationttle Numerous pilot studies have been completed by o)~her jurisdictions involving both .. experienced'and novice composters to evaluate various compost bins. Tile San Marco County Compost Bin Task.Force reviewed many of these pilot studies and dete,',~iried that enough information already existed in the cqmpleted st'udies to select an apprb, priate bin for San Mateo County residents without conducting an additional pilot study. To' s~lect a bin using existing studies the ).n~k fo~ first prepared a Iisi of evaluation criteria and assigned points to the criteria to indicate each criteria's relative importance. The evaluation studies were then reviewed and three bins were identified as candidates. Jurisdictions using one or more of the bins were contacted for feedback. We also contacted each of the manufacturers. After considering n'or the available information, the Biostack Composter was selected' as the best bin for .san Marco County residents. A summary of how the bin' rated on the criteria identified as most important (listed below in descending order) follows. Effectiveness: HOW effective is the bin at producing finished compost? The Biostack Composter's patented three tier design is suitable to many types oSusers. The user'interested in prodt,cing compost quickly' will be able to do so easily. Frequent turning of the pile relies and aerates the m:iterials resulting in rapid decomposition and qt,ick results. The three tler design makes turning the Pile easy. The stackable tiers are simply unstacked and restocked' and the initial pile is scooped into the new stack.. Alternatively, for the user . interested in a low maintenance process, the three tiers eon be used effectively for Iow inpt, t, slow composting by leaving the initial stuck intact and letting the materials .compost inside 'unassisted.' · . .Attachment I - Page 2 of 8 :