42 commercial, industrial and residential inspections of drains, drain fields, pumps, traps, lift stations, plumbing, pipes and sewer lines; inspection services in the nature of video imaging of drains, drain fields, traps, lift stations, plumbing, pipes and sewer lines, electrical conduit, tubular piping, and the like; location and mapping of underground plumbing and pipes; hydro-static testing, static testing, smoke testing, safety testing and consultation in the field of gas utility equipment to prevent gas leaks, foundation damage, sewer smells, and ground sinking