Concrete Pipes will take higher capacity loadings than HDPE and quite often it will be cheaper to install when using open cut trench method
There isn't a general rate per ha for developments, it is usually case by case
Trimble GPS Base and 2 Rovers
It is often best if the surveyor is one of the first contractors on site as it allows them to collect the critical information they need before the surface/physical features/levels are disturbed.
No two surveys are alike, therefore we always give a quote.