Any comments welcome.

I may be over thinking this but this is a one shot deal, if it fails I am
done I may not be able to back things out especially if the joint busts
and I can only back out one end of it.

Thanks,

MC

I suggest you re-think this process. The pipe is very likely to sieze if the
soil is allowed to settle around it. Water washing is generally done in one
continuous process. If you have to stop and start you would be better off to
use a mechanical drilling system of some kind.

Don Young