I require official noise test measurements for a legal dispute, (i.e. excess noise across a domestic boundary) or report as part of council, EPA or OHS requirements.
You will require, (and it will be in your own best interest) to engage the services of a fully qualified acoustical consultant. You will find a list of these in the Yellow Pages under "Acoustical Consultants".
If sound proofing is considered the best solution to your issue, Acoustic Answers would be happy to assist with solutions to control the noise pollution.