Use commons sense and math to get a quick read on whether the site you've chosen will be quiet enough to satisfy your client or your family.
Some people love the sound of train horns and the rumbling sound of wheels on the tracks. Others quite literally hate the noise. Perceptions of "acceptable" noise levels are often arbitrary and subjective, especially in the "middle" range of 40-60 decibels or so. One person's pleasant white noise in the background is another person's source of endless unhappiness and complaints.