Modern principles and practices of chemistry, biology, microbiology, environmental science, environmental policy, or environmental protection applicable to resource management, urban runoff, wastewater, water use, water efficiency, hazardous materials, industrial waste, or solid waste, recycling, and organics management. Physical Conditions: Essential functions may require maintaining physical condition necessary for walking, standing or sitting for prolonged periods of time; exposure to computer screens, speaking and hearing to exchange information; visual acuity to read and interpret specifications and regulations.