I do independent assurance testing in our department. One of the issues I face is when doing a side by side sand cone test with another technician we are at times 4 - 6 pounds different on our wet density. These tests are done no more than a foot away from each other in the same material. It is my job to determine where the error is and correct it. Other than the sand and cone calibration, what would be some other aspects to look at that may cause this much difference in wet density? This occurs at times in both granular material and soils.
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