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Depending on why it failed in the first place, there doesn't appear to be a reason to haul it out. Seperation of the large trees, using the soil there and possily using 'benching' to reduce future slope failures, which would require the same equipment needed to remove it, seems like it would...

Thanks-makes sense. The regular protocol for using a nuclear gauge on asphalt is to establish the calibration through a series of roller patterns. Just plopping a gauge on the road after the fact and expecting that number to represent density is no good. Any info on what exactly that gauge...

We did Marshall laboratory testing to determine the theoretical unit weight of new asphalt, took 6 inch diameter cores of the road, and determined the density to fail (less than 95-100 percent); the contractor came back and used a nuclear guage to say the density passed. I need backup as to why...