What is over excavation?

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The short answer...

excavation gets you to grade, over-excavation gets you below grade and is based on engineering requirements.

The longer answer...

In grading work there may be times when plans specify to cut or excavate to a particular elevation. There are other times when an over-excavation will be specified to remove unsuitable soils to a certain depth. So lets say that you are at a site where the native elevation is at 460' and plans call for finished grade at an elevation of 450' with an over-excavation of 5.' What this means is that you would excavate down 10' (from 460' to 450') and then over-excavate down an additional 5' (from 450' to 445')

At that point the bottom of the over-excavated location will usually have x number of inches to be scarified, moisture conditioned and compacted to a certain percentage of the maximum dry density obtained in laboratory testing. The removed soil (aka: over-ex or OX) will then be replaced with suitable material in lifts of a specified thickness with an optimum moisture content and compacted to a particular percentage of the maximum dry density.
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What is excavation?

Excavation is the loosening and removal of soil from a certainarea... ------------------------- digging a hole is excavation.

What is an excavator?

it is a machine used to dig the earth, it can also be used to lift thing such as a crane would, but only as high as the boom of the excavator will rise and the weight is depen (MORE)
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What is excavated?

Excavated means, like, how do they take it out, or how do they extract it? _. Excavated means to like dig up something or find something and Get it by digging it up.

What is a excavator?

EXCAVATOR are heavy construction equipment consisting of a boom, stick, bucket and cab on a rotating platform (known as the "house"). The house sits atop an undercarriage wit (MORE)