42 municipal and industrial water and wastewater engineering services; custom design of water and wastewater treatment facilities; providing highway design, land surveying and topographic mapping services in connection with water and wastewater treatment facilities; wastewater, sludge and storm water management services; hazardous waste management services; analysis services relating to infiltration and inflow of water and wastewater; providing treatability studies for wastewater; environmental audit services; consulting services regarding water processing, distribution and storage, the by-products of wastewater, and waste pretreatment systems