At Geosynthetic Systems, we know dirt. From Peter Mulrooney’s early childhood midsummers expended selling “black muck” (which his father Clarence had collected by hand) by the bag in Ottawa’s Byward Market , near his work in road construction in the 1960s, to landscape design & construction in the 1970s, our family has been involved in the local construction industry in one way or another for more than 60 years.