This is a Sources Sought notice to identify capable firms for Hazardous, Toxic, and Radiological Waste (HTRW) and general environmental consulting services across the U.S. Army Corps of Engineers' Great Lakes and Ohio River Division, which includes numerous districts and states. The scope includes a wide range of services such as environmental site assessments, investigations, sampling, analysis, and reporting. The potential Indefinite Delivery Contract(s) may be worth up to $3 million if all options are exercised, with individual task orders typically ranging from $5,000 to $100,000. The government requests detailed capability statements, including specialized experience, professional qualifications, past performance, and capacity to handle approximately $500,000 in task orders per year. Responses are required by the specified close of business date and must be submitted electronically to the listed contacts.