A concrete dumpster around Johannesburg means weighing dense single-material loads that need a low-side box with a marked fill line before anything else. Dirt, concrete, brick and tile carry weight that outruns their bulk, so the container built for this job is shallow and stops loading long before it looks full. Check whether the quoted price covers one drop-off and one pickup, or whether extra trips for a swap get billed as separate visits.
Skip the surprise: in Johannesburg, the load only earns the recycling rate while it stays one material. Contamination costs the whole saving. Johannesburg's waste ends up at strict diversion requirements and widespread C&D recycling, and what that facility accepts is part of what determines the container size, not just the job itself. The age of housing in Kern County, mostly pre-war bungalows through 1960s-70s slab tracts, is a bigger factor in what fills the box than how big the house is.
Most haulers quote 10 yards for concrete in Kern County, sizing for tonnage first and cubic footage second. Whoever ends up making this call in Johannesburg is usually contractors and landscapers. A job in Johannesburg draws on the same fleet that services Kern County, which is why the price shifts depending on which side of town you're on. The truck headed to Johannesburg started its day in Kern County, and that trip is baked into what gets quoted. If there's no room on site and the container has to sit on the street, budget time for city encroachment permits, CalRecycle diversion reporting. Load flat, heavy pieces first and let lighter debris fill the gaps. It keeps the pile from tipping toward one side.