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n 11 11 Appendix I 7 is delivered to the disposal sites in drop boxes. Thirty industrial drop boxes were sampled at the Lovelace Transfer Station, Harney Lane Landfill, and Corral Hollow Landfill. Self -haul loads are accepted at all four of the County's disposal sites and arrive in a variety of vehicles from cars and pick-up trucks to vans and trailers. They usually represent residential or small business wastes. The small businesses include roofing contractors, yard maintenance firms, etc. The loads are varied and may lend themselves to a full sorting and weighing as was done for the residential study, or may contain only yard wastes, construction debris or roofing materials. In the latter instances, the 250 lb. average sample weight was attributed to the single material and the loads weren't actually weighed. Thirty self -haul loads were sampled at the County's disposal sites. The number of loads sampled at each site was determined by the percent of the total amount of self -haul wastes received at each site in 1989. The Waste Characterization Study was carried out by staff from the Solid Waste Division of the County's Department of Public Works and one or two Alternate Work Program (AWP) participants. The initial portion of the study was carried out primarily during the month of June, 1990 at the Lovelace Transfer Station and the Harney Lane, Corral Hollow, and Foothill Sanitary Landfills. The waste quantities in the characterization of the disposal stream are reported by weight only. Volume measurements could not be accurately performed in the field. Many materials were present in the samples in very small or very large quantities. Sorting a cubic yard sample of residential waste might result in a waste type sample consisting of nothing more than two small 11 11 Appendix I 7