I had a contractor using a backfill material that was tested using the modified proctor method yielding an optimum water content of 6.8% and max dry unit weight of 21.28kN/m3. They recently "retested" the backfill material getting a new corrected wc of 10.7% and max dry unit weight of 19.94 kN/m3. Thats a pretty drastic change in optimum wc and a drop in the max dry unit weight on the same material in my opinion. I am now getitng compaction test results with many coming above 100%, which itself not a huge deal, but several have been above 102% and even 103%. I am questioning these results now and while I am not concerned with the values around 100% I am worried that any test that resulted in a 95% to 97% percent compaction are not "true" values and may be lower than the specification requirement of 95% compaction. Thoughts?
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