I want to replace an existing black plastic water pipe with MDPE. Stop-tap on path in front of house is plastic quarter-turn job. Run is 20m point-to-point and will require trenching - soil is clay. Whilst I'm expecting costs for council path closures and such, I've just received a quote that's based on 15 man-days of work on-site. This feels very excessive. Any experiences or thoughts would be greatly appreciated.