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A site development contractor is excacvating in fine silty sand. Because of the cut location and lack of drainage, surface water has drained into the

A site development contractor is excacvating in fine silty sand. Because of the cut location and lack of drainage, surface water has drained into the cut, leaving the material very wet. Rubber tired scrapers are hauling material from the cut to an adjacent fill. The material is being placed in the fill in 8-10 inch lifts and compacted by a heavy sheepsfoot roller towed by a crawler tractor. The required compaction (95% of Proctor density) is not being achieved. The sheepsfoot roller is not "walking out" and the scraper tires are causing deep rutting and displacement of the fill material as they travel over it. What is causing the compaction problem? What would you suggest to the contractor or geotechnical inspector to improve the compaction process, and why? Please suggest two ideas with reasons

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