Ms. Langan is a Senior Environmental Engineer with GSI with over 22 years of progressive engineering experience in the environmental consulting industry. She is a Licensed Professional Engineer in Alabama, North Carolina, South Carolina, and Virginia and a Registered Site Manager in North Carolina. Ms. Langan specializes in corrective action planning and remedial alternatives design and implementation under regulatory programs including CERCLA, RCRA, voluntary cleanup, and state-specific programs. She has led several multi-phase environmental projects focusing on site assessment, corrective action planning and implementation of alternative remedial designs. Ms. Langan has consulted on remediation projects at various facilities including manufacturing facilities, industrial sites and military installations with various contamination concerns including chlorinated solvents, petroleum hydrocarbons, and emerging contaminants including perchlorate, hexavalent chromium and per- and polyfluoroalkyl substances (PFAS).