Does anyone know where I can find surveys related to the level of retirement benefits provided to non-union, hourly employees of US employers?

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One source is the U.S.Dept of Labor, BLS survey "Employee Benefits in Medium and Large Private Establishments". The groups in this survey may not exactly correspond to your wants, but the survey has a lot of information.

For what purpose do you want the information?

Here is a link:
http://www.bls.gov/