37 Installation and repair of plastic pipe sewer liners; lining the interior of pipes for others by spraying on a fluid impervious barrier in the nature of a mixture of polyurethane and epoxy resin; maintenance and repair of pipelines; pipeline construction and maintenance; repairing corrosive or leaking pipes through pipelining, namely, coating the inside of the pipe with a durable safe epoxy; sewer and drain cleaning, inspection, repair, replacement and maintenance services;