Morgan Est has been fined £6,000 after an accident which saw an employee lose his arm at a sewage works.
The Morgan Sindall civil engineering subsidiary pleaded guilty to breaching health and safety regulations after the incident at a Huddersfield Waste Water treatment works in March 2008.
The contractor was fined £6,000 and ordered to pay costs of £2,163 at Huddersfield Magistrates Court.
The court heard that on 12 March, an engineer employed by Morgan Est lost his right arm after coming into contact with a rotating screw conveyor on a newly installed piece of equipment at Neiley Waste Water Treatment, in Holmfirth.
Morgan Est was main contractor contractor for client Yorkshire Water on the refurbishment of the water treatment works.
A new sludge treatment plant had been installed and was in the process of being commissioned when the accident happened.
An investigation by the Health and Safety Executive found that a fixed guard on a screw conveyor had been removed to allow clearance of a blockage of sludge.
Morgan Est accepted that it had failed to carry out a suitable and sufficient risk assessment for the clearing of blockages in the sludge plant during commissioning works.