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

Home

ATTACHMENT D SAMPLING METHODOLOGY AND CALCULATIONS 2. Generator type a. Commercially hauled loads only i. Loads that were 80% or more residential waste were recorded as "residential" ii. Loads that were 80% or more commercial waste were recorded as "commercial" iii. Otherwise, the generator type was recorded as "mixed" b. Transfer station loads only - always marked as "mixed" 3. Vehicle type a. Commercially hauled loads only - recorded as "packer," "roll -off," or "other vehicle" (e.g. flatbeds, dump trucks, pickups). b. Transfer station loads only - were always recorded as "transfer station box." As the load was emptied at the West Hawaii Landfill, the Field Supervisor observed the load for evidence of hard -to- process or potentially explosive items. Details regarding these items were noted on the sample's waste sort sheet. Hard -to- process items included anything that would be difficult or impossible to manually sort, automatically process, or transfer by conveyor belt due to weight or size, such as: appliances, mattresses, cabinets, carpet, asphalt or concrete, and large pieces of scrap metal or lumber. Next, the selected load was visually divided into an imaginary 16 -cell grid. The supervisor then identified the randomly selected cell and approximately 200 to 300 pounds of waste was removed from that cell with a loader and placed on a tarpaulin. Samples were then tagged with a sample identifier labeled with their unique sample number and the date. Once the total weight of a sample was recorded, the material was sorted by hand into the 58 prescribed components, placed in plastic laundry baskets, weighed, and recorded. (See Attachment C for a list and definitions of the components.) Each sample was sorted by hand to the greatest reasonable level of detail, until no more than a small amount of homogeneous fines (less than 1 square inch) remained. The goal was to sort each sample completely into component categories. However, if fines did remain after sorting, they were weighed and the Supervisor classified them as "mixed residue." As the final step in collecting field data, the Supervisor reviewed, completed and organized the forms from each day's sampling activity. The Supervisor also prepared data summary sheets and sampling checklists at the end of each day. Completed data forms were then transmitted to the Project Manager at CH2M HILL for review and quality control prior to data entry. Waste Composition Calculations The composition estimates represent the ratio of the components' weight to the total waste for each noted substream. They are derived by summing each component's weight across all of the selected records and dividing by the sum of the total weight of waste, as shown in the following equation: APPX B WASTE COMPOSITION REPORT 121709.DOC D -3