In an action for mandamus and declaratory relief brought by a contractor trade association, the trial court's ruling, that sanitary district defendant lacked statutory authority under Public Contact Code section 20803 to engage its own work force to complete a sewer system improvement project without putting the project out for competitive bid and contract, is reversed where nothing in the statutory language or scheme of section 20803 would limit defendant's autonomy to complete its pipebursting project or projects using its own labor force.