Mrs. Bita Tabatabai is a Principal Engineer with GSI Environmental Inc. and has more than 33 years of experience in soil and groundwater investigation and remediation. Her expertise includes Phase I/Phase II investigations and remediation under federal, state, and local regulatory agency oversight. Her work includes feasibility studies, pilot tests, permitting, design, installation, operation and maintenance of remediation systems, regulatory compliance, and cost allocation/litigation support. She provides her expertise to real estate professionals, developers, and industry owners that require due diligence or remediation and has successfully worked with environmental regulators at the local, state, and federal level. Mrs. Tabatabai has addressed issues in soil vapor, soil, and groundwater impacted with volatile organic compounds (VOCs) such as trichloroethylene (TCE) and tetrachloroethylene (PCE), petroleum hydrocarbons, metals, polychlorinated biphenyls (PCBs), pesticides, 1,4-dioxane, and other constituents. Her experience with a wide variety of in situ (injection of oxidants, surfactants, and biodegradation products) and traditional (excavation, soil vapor extraction, and high vacuum soil and groundwater extraction) remediation techniques have resulted in expedited closures of properties. A large portion of her work is focused on redevelopment of contaminated properties. These projects have included developing risk-based cleanup criteria for residential developments.