This Sources Sought Notice is market research only for a potential small-business set-aside and will not result in an award; no solicitation, specifications, or drawings are currently available. The Government seeks capability statements from interested contractors—especially HUBZone, WOSB, SDVOSB, VOSB, and 8(a) firms, though other-than-small businesses may respond—to assess market capabilities and acquisition strategy. The intended contract is a Firm Fixed Price order with a five-year period of performance from award. Work supports CERCLA PFAS remedial investigation at a California BRAC site under an active Federal Facilities Agreement, with UFP-QAPP/FODIS compliance and California DTSC/Regional Water Board oversight. Scope includes PFAS-compliant drilling and multi-aquifer well installation, groundwater monitoring, investigation-derived waste management, HydraSleeve vs. low-flow and GAC efficacy studies, and RI/FS reporting and stakeholder support.