I have a contractor I do work for who needs a price on runing (3) 4" plastic conduit for electric, telephone and cable tv underground (3' deep) about 300' in one trench a straight run from one utility pole to another. Normally I price pipe install by the liner foot in this case do you charge by the foot x 3 or fiqure your time & material plus markup? Also just woundering what you guys would get a liner foot installed I know a union contractor told me to charge 18-20$ or non union 10-12$ i was thinking 10$