Why not MDPE pipe. Easier to lay and less liable to fracture over the years
of settlement?

http://www.pipestock.com/mdpe-pipes-fittings-valves/

Thanks for the suggestions thus far. I am not familiar with these new
pipe materials but a quick search on your link shows they are a viable
material for my application. Still slightly unnerved by plastic
handling 65 psi constant and be reliable, especially at the solenoid
controlled master valve it ends in. Any suggestion on this critical
component in 3/4 inch?