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P-Train:
In CA anything requiring mortar joints gets a 4" concrete slab, with #3 rebar on 24"o.c. for a base.
Water levels are a joke for this type of work, throw-out those instructions.
Lots of time involved for the dirt removal so don't cut yourself too short on ridding the spoils. Its costly.
Mortar beds in he long run last forever, so obviosly it costs more up front.
The client needs to understand this.
I own a Bobcat 553 for the dirt demo, however you can rent those 443's in most markets.
We use 20' lenght bender boards to set our grades and layout, forget about the strings.
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