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I assume it is a contact adhesive type? Similar to Selleys Kwik Grip? The advise about removing the adhesive first, what was the reason or basis for removing it? I personally wouldn't be concerned too much about removing the adhesive if you are laying a new foam underlay directly on top of it. I cannot anticipate any issues in doing that. The same goes for laying carpet directly onto the concrete (with adhesive still on it). As long as the surface was flat.
Edit: are you planning to glue the new carpet to the slab? If so I still cannot foresee any issues with leaving the old adhesive in place.
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