42 Design, development, planning and research services in the field of wastewater processing, purification, treatment and disposal; management services in the field of wastewater processing, purification, treatment and disposal; repair services in the field of wastewater processing, purification, treatment and disposal; technical support services in the field of wastewater processing, purification, treatment and disposal; and, consulting services in the field of wastewater processing, purification, treatment and disposal