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Collection vehicles enter the facility and are weighed on 70-foot platform scales equipped with a computer system that prints out pertinent data. After weighing, the vehicles move up a ramp leading to a totally enclosed 21, 600-square foot transfer station located 15 feet above existing site elevation. Collection vehicles enter the building and discharge their loads on the tipping floor at the direction of the front-end loader or station operators . Public vehicles (autos and pick-ups with or without trailer) drive to one of nine positions provided along the exterior wall and discharge their loads through openings onto the tipping floor. Under normal operating circumstances, public vehicles are not permitted inside the station or on the tipping floor. The front-end loaders ' function is to segregate any recyclable paper, cardboard, white goods, etc. , and to push the remaining refuse into the transfer trailers. The recyclables are directed to the chute area where they are discharged to either the baling operation or the scrap bins, all located at ground level. Any white goods considered in usable condi- tion are stored separately and removed to the flea market for sub- sequent sale. Two basic types of transfer systems are considered: Direct Dump into top-loaded trailers and Hydraulic Compaction using stationary compactors and rear-loaded trailers: Since these two basic transfer systems are potentially suited to Stockton Scavenger' s anticipated waste quanti- ties and characteristics, they will both be investigated in this report. Direct Dump - Top-Loaded Trailers In this system, open top trailers are loaded by gravity directly from the station' s tipping floor. Figure 3-1 illustrates this concept. Front-end loaders operating on the tipping floor have backhoes with clamshell attachments which are used to distribute, compact and level the trailer load as necessary to obtain maximum payloads. Payloads vary depending on the type of refuse being loaded. For the purposes of this study, an average payload of 17 tons is used. The volume capacity of these trailers is approximately 110 cubic yards . At the disposal site, the trailers self unload by an hydraulically activated conveyor on the bottom of the trailer. Hydraulic Compaction - Rear-Loaded Trailers This system utilizes an enclosed transfer trailer that is backed into position and locked to a stationary compactor. Refuse is loaded into the compactor from above and the hydraulically-powered reciprocating ram of the compactor forces the refuse horizontally into 65-cubic yard trailers which average 18-ton payloads. Trailers are equipped with an hydraulic-powered bulkhead which traverses the length of the trailer for unloading at the disposal site. This concent is illus- trated in Figure 3-2 . 9