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I've used B D Finch's "central facility" as being more generic in this case (this "central facility" could be a concrete batching plant, of course). Thanks, BDF, and to the others. 4 KudoZ points were awarded for this answer
Explanation: They are referring to the centrale à béton where concrete is batched and loaded into mixer trucks. Excess concrete in the drum used to be discharged on site (everyone in NZ or Australia knows someone who had a house built years ago in a suburban subdivision and when it came to preparing a vege garden found a dirty great mass of buried concrete disposed of there by the builders). Now it is taken back to the batching plant, and disposed of in a special pit. Rinsing water is often used as mix water for another batch of concrete. All part of sustainable development.
xxxBourth Local time: 17:01 Specializes in field Native speaker of: English PRO pts in category: 4135