Under minimal direction, performs a variety of senior environmental and hazardous materials professional level functions and analysis in assigned functional areas, manages the acquisition of environmental due diligence services and development of remediation strategies for contaminated sites, ensures environmental compliance for Sound Transit projects related to remediation of contaminated real estate; ensures compliance with all federal, state and local environmental regulations, local hazardous material related regulations; maintains effective working relationships with other agencies and Sound Transit partners including the Washington Department of Ecology, the Environmental Protection Agency, the Federal Transit Administration (FTA), and Puget Sound Clean Air Authority, King County, Pollution Liability Insurance Agency; and provides strategic advice to project managers on environmental compliance and due diligence issues. Manages environmental due diligence activities for Sound Transit projects beginning with critical input during project development; reviews planning documents related to hazardous materials; assists with early screening of alternatives; determines potential environmental remedial expenses for proposed projects; provides input on preliminary project schedules; oversees environmental consultant support for the environmental due diligence effort including negotiating scopes and budgets, leading regular coordination meetings, tracking schedules and spending, and reviewing work products.