I am the project manager and need to make sure that what the contractors are recommending is the most optimized solution

No offense, but if you are the project manager and have to come to an internet forum for your information you have some serious thinking to do about your ability to handle the job.

About all I can tell you is if you don't know what these guys are doing or how it should be done hire someone who does.

-Hal


CALIFORNIA PROPOSITION 65 WARNING: Some comments made by me are known to the State of California to cause irreversible brain damage and serious mental disorders leading to confinement.