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Andy Champ

wrote:

We were planning to dig down 750mm (exposed to strong winds) and
concrete wooden posts in. What's the best way of digging the new post
holes and not damaging the sewer pipes?

A spade. They're pretty tough, you'd have to be really ham fisted to
break one by hand. A machine or a pickaxe would break one with no
problem (as my neighbour found out...)

I'd also suspect a metpost would puncture a plastic one quite nicely, or
crack a ceramic one.

Andy