Appendices to Integrated Resources & Solid Waste Management Plan - Dec 2009

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HAWAII COUNTY MECHANICAL - BIOLOGICAL TREATMENT FACILITY CONCEPTUAL DESIGN Stockpiling finished compost in 20 to 30 foot high piles with a "stacking conveyor" is a common practice for storing inventory in a small area. Exterior Roadways and Working Surfaces The design of exterior roadways and access lanes (e.g., lane widths, turning radii, maneuvering areas) must be able to safely accommodate waste collection vehicles including roll -off trucks, side and rear load residential collection trucks, and long -haul transfer trucks. Adequate setback is required for perimeter roadways in order to meet zoning and building code requirements. Roadways and working surfaces should be constructed of asphalt, concrete or equivalent materials that are capable of withstanding the weight of vehicles and site equipment. Hard surfaces are also recommended to help prevent dust generation, and because hard surfaces are generally easier to clean. Weigh Scales All vehicles delivering feedstocks should be weighed prior to unloading at the facilities. Since the two facilities would conceptually be located adjacent to the WHSL and SHSL operations, it has been assumed that vehicles would use existing scale systems. Additional Requirements In addition to those outlined previously, the facility should also include the following components: A staff break room and suitably sized washrooms, locker rooms, and shower facilities for the facility's expected staff requirements • A dedicated Control Room • A laboratory that is appropriately sized and equipped to complete analysis of samples for process control purposes (e.g., moisture content, pH, weighing, particle size, and sample inspection / sorting). Conceptual Facility Design Pre - processing Equipment Selection The recovery of MSW components through manual and mechanical separation, and the subsequent preparation of feedstocks for composting, requires careful consideration and design. While many of the MSW components (e.g., ferrous and non - ferrous metals, paper fibre, plastic4) can be recovered, the quality of the materials may not be acceptable for some markets. Materials recovered from mixed MSW streams are often wet or coated with organic matter (e.g., green waste or food waste) and can not be recycled through traditional markets. The materials may also have smaller particles of foreign matter clinging to them (e.g., stones, bottle caps) that make them unacceptable at recycling facilities. 4 Glass is typically not recovered at MBT facilities because it is often broken into smaller particles during the waste collection and transfer process, and recovery of small glass particles is very difficult. 17