dbw1968,
You will really be pushing the limits on a linear compressor at that depth and you have not even taken in that measurement the amount and size of supply line you will be using.
I would suggest upping to eaither a rotary vane and even then you can guarantee that you will be changing the vanes every year because of that pressure (6.6 psi just for the depth) or, go with a wobl piston compressor. They are quieter than a rotary vane.
Options like the type and size of a cabinet to house the compressor will greatly reduce the noise levels.
