The U.S. Army Corps of Engineers Baltimore District requires a contractor to perform PFAS remedial investigations and related environmental services at four Base Realignment and Closure (BRAC) sites nation-wide. This is a total small business set aside based on NAICS 562910 size standard of 1,000 employees. See the request for proposal and attachments for full information. Amendment 0001: Reference documents provided in attachments. Amendment 0002: The purpose of this amendment is to provide responses to questions submitted to ProjNet and revisions to the solicitation. To receive the additional attachments noted in the amendment section J, submit the NDA (attached below) to Contract Specialist Erica Stiner (erica.j.stiner@usace.army.mil).