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Explanation: My guess for their use of these particular terms would be that they are seeking to differentiate between a grassed area [parc] or a concreted (etc.) area [terrasse].
Lots of different ways of expressing this in English, and depending of course on the nature of this particualr factory's site; but I feel 'grounds' could work OK for unspecified grassy area, and 'yard' could indicate somewhere with a hard surface.
Tony M France Local time: 00:01 Native speaker of: English PRO pts in pair: 14064