Dig and backfill house trench

Our house is on a hill and needs the drainage redone on 2 sides of the house with elevation. To do this we need a right angle trench dug. It’s next to a walking path and needs to be about 2-3 foot wide in parts. Approx 10m trench one side getting progressively deeper, and approx 8m at above head height from foundation level. The house needs waterproofing paint applied also and when the trench is finished with, then backfilled. 1971 house, concrete floor built on concrete block basement. This quote is requested for just the trench costs, not the other work.