Profile: Sevenson Environmental Services, Inc. provides a wide range of services for the cleanup of sites and facilities, contaminated by hazardous materials. Our range of services includes excavation & earthwork, HTRW materials handling, processing & treatment, traditional steel sheeing systems, dredging, dewatering & volume reduction, sediment remediation, temporary & mobile water treatment systems, sludge solidification & soils stabilization, chemical treatment/heavy metals fixation and slurry wall & trench construction.