Construction of the vault for broadband seismometers has a direct impact on data quality. A short discussion of these topics precedes the construction details because you should really pick the right site before going to all the work of building a vault. It takes a long time to find good sites which balance the competing requirements of low noise, access, security, position within the array, power, permission, etc. Finding one site per day is fairly productive.
Quarries are less of a concern as they shoot a few times per day.
Close proximity to heavy earth moving equipment however is noisy all the time. Basically, big moving things are a problem especially when they are active for large portions of the day and irregular. Some very regular ground motion as induced by turbines and diesel generators are so monotonic that they are easily filtered from the seismogram. Not bedrock within 10-20 meters of the surface, ON bedrock outcrops. Preferably in a place where you dig down 1.5 meters to the outcrop and it's kind of level.