When new sidewalks were put in our area, the contractor extended the
sprinkler system under the sidewalk to cover the swale area. But he
connected that area to just one of the existing zones and there's not
enough oomph to get full pressure all the way to the end. I want to
split the added line and connect part of it to another zone, but to do
that I have to go under the sidewalk. The fill that was used for the
swale area has LOTS of compacted rocks which makes it difficult to
even dig a hole to plant something. How do I get new piping under the
sidewalk?