Adrian
You didnt mention what diameter yr pier was, I assume its 300mm or so.
My concrete pier is about that hieght and yes, it pings when belted, but that high frequency is unlikely to cause a problem, Ive never had one. And anyway, yr unlikely to hit the pier whilst imaging !.
Low freq disturbance such as wind will not be a problem (on the pier anyway), I wouldnt worry.
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