Carollo Engineers provides a full range of planning, design and construction management services to meet the water and wastewater needs of municipalities, public agencies, private developers and industrial firms. Founded in 1933, the firm has completed more than 15,000 public sector projects. Its stormwater treatment process include air stripping, conventional granular activated carbon adsorption, biologically enhanced activated carbon, ion exchange, membrane filtration processes, reverse osmosis, and oxidation and filtration. The firm s wastewater treatment services include biosolids management, wastewater infrastructure and wastewater planning. Its staff includes civil, sanitary, environmental, electrical, mechanical, chemical, structural, control system, and corrosion control engineers, as well as architects and planners. Carollo Engineers is located in Phoenix, maintains more than 20 offices in over 10 states.