We have had an engineering drawing prepared by the company that undertook the ground investigation. It is almost identical to one of the sample designs provided by the turbine manufacturer. I guess this is reassuring, but it also makes you think, “Why did we bother with all that expensive investigation? I could have told them about the boulder clay anyway!” But you do of course have to do the test drilling, as we could have been on top of a random sand pocket, or saturated conditions lower down. Now we can be confident that the turbine is not going to fall over!
Using the drawing, I have had an alternative quote for the foundation construction from a civil engineering company in Telford. This was substantially higher than the figure quoted by my turbine installation company. Hopefully my choice of installer will be justified, and they can now crack on with the job.
