I'm negotiating to get the base for my HG70-HD dug and poured. I have a high
water table, soil tends toward sandy, and an engineer said he would be happier
if the hole were 10' deep rather than the 7.5' called for in the manual.
The concrete guys I'm talking to want to line the hole with plywood to prevent
collapse. One guy who does a lot of big sign installations says he does it
regularly, and there would be no stability issues.
I've read several times the pour needs to be into undisturbed soil, no
backfill, altho that's not in the manual.
What are the facts?
73, Mike NF4L
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