Discovery of hazardous materials during excavation is considered an emergency and the EH&S emergency response team should be contacted immediately at (510) 642-3073 including on weekends and after hours. Immediately stop work and isolate and restrict access to the area in question. EH&S will assess the soil. Contaminated soils can only be excavated by a licensed hazardous materials contractor. If the project contractor is not licensed, EH&S will work with you to obtain services of a campus approved hazardous materials contractor.