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Hi Andrew,
thanks so much for your input. I'm curious just what your final word would be. The site is quiet (Mount Stromlo) with the only movement being grazing kangaroos. The plug is isolated from the concrete slab by a cylinder of rubber down to a depth of 100mm. From there, both the plug and the slab are in contact with the ground. The pier is held down by six chemset bolts. The mount is a Paramount ME, so I'm assuming it's pretty good quality and vibration free. Movement in the dome will also be dampened by marine grade carpet/rubber backed. Do you see, in your opinion as an engineer, the need to fill the pier with sand? I can always retrofit this thing if needed, but it's going to be impossible to take out if I change my mind. The decision is an important one since it is entirely for public (high school/college) education, and hence there is a severe pressure to do a lot with a very limited budget. In other words, I need to get it right.
Cheers,
Geoff Mc
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