42 Water quality control services, scientific and industrial research services relating to environmental protection, laboratory research services in the fields of water and water treatment and purification, chemical analysis, chemical research, engineering project study, engineering work, preparation of non-business plans and engineering works not for construction, namely, engineering studies in the fields of water and water treatment; expert appraisals in the field of water and effluent treatment; laboratory research services in the fields of industrial, household, hospital and special waste, refuse, sludge and ash treatment, industrial, household, hospital and special waste recovery; bacteriology research services, engineering advice and expert appraisals in the field on industrial, household, hospital and special waste, sludge and ash from plants, both urban and industrial; computer programming for others, computer services, namely, development, design and updating of computer software and software packages for others; technical consulting and advice in the field of computing, computer rental, design of computer and telecommunication systems, scientific and industrial research services for developing and evaluating the performance of physico-chemical water treatment processes and products; scientific and technical studies for developing and evaluating the operation performance of installation for treating drinking water or industrial process water, for treating household or industrial wastewater, as well as for treating physico-chemical or biological fluids and sludges, engineering advice and work relating to these processes and equipment and to all other fluid treatments, including in the field of industrial processes; research center services in the field of collection, transport, treatment, cleaning, storage, sanitation, recovery and disposal of waste and refuse; engineering advice and expert appraisals in the field of waste and refuse, scientific and industrial research relating to environmental protection for the collection, transport, treatment, cleaning, storage and recovery of waste and refuse; engineering, engineering project study, engineering work services in the fields of design and construction of industrial and urban centers and units for waste and refuse collection, sorting, storage, treatment, recovery and disposal; pollution prevention services, namely, testing or research on pollution prevention, consultation on environmental protection, urban, industrialization and natural resource development planning, environmental information, study of economic, social and environmental implications of urban, industrialization and natural resource exploitation or development operations, especially relating to water