Improving Remedial Implementation Quality through Field Verification
Susan Sitkoff, P.G., Capital Improvements Project Manager, City of Orlando and Joseph Bartlett, P.E., Environmental Engineer, Geosyntec Consultants, Inc.
Historical chlorinated solvent releases at the Former Spellman Engineering Site resulted in the contamination of the underlying surficial aquifer. Due to the lack of a PRP to take on the liability of the site, the City of Orlando entered a Voluntary Cleanup Agreement with the EPA to take on the responsibilities. Decades of assessment and remedial activities at the Site have resulted in a very dynamic environment and an ever-changing Conceptual Site Model. Most recently (Nov. 2021), an Enhanced In-Situ Bioremediation and Emulsified Zero Valent Iron injection event was conducted where confirmation events (before, during, and after the injection activities) were conducted: (i) Before – pre-injection investigation activities (initial design based on existing data from MW network, by others) resulted in significant changes to the treatment areas; (ii) During – confirmation soil borings were advanced to visually verify amendment distribution; and, (iii) After – performance monitoring included purging additional volume at select wells for visual confirmation of amendment. The multiple field verification events provided data needed to ensure proper implementation and was paramount to the success of the project.
Mrs. Sitkoff is a licensed Professional Geologist with 28 years of experience in soil and groundwater assessment and remediation. Mrs. Sitkoff's experience includes remediation of chlorinated volatile organic compound (CVOC), petroleum hydrocarbon, inorganic, ammonia, polychlorinated biphenyl, perfluorooctane sulfonic acid (PFOS) / perfluorinated alkylated substances (PFAS), and polynuclear aromatic hydrocarbon (PAH)-impacted sites. Mrs. Sitkoff has utilized numerous remedial techniques to address CVOCs including large diameter auger (LDA) with stem enhanced extraction and emulsified zero valent iron (EZVI), bioremediation using emulsified vegetable oil (EVO), horizontal and vertical air sparging systems (HVASS), solar recirculation systems, in-situ chemical oxidation (ISCO), phytoremediation, and thermal remediation.
Mr. Bartlett is a licensed Professional Engineer with 12 years of experience in environmental assessment and remediation services, including investigation and feasibility studies, remedial design, and remedial action implementation. Mr. Bartlett’s experience includes an emphasis on assessment and remediation of chlorinated volatile organic compound (CVOC) and petroleum-impacted sites that have required extensive coordination and cooperation with a variety of clients and regulatory agencies including federal, state, municipal, private sector, and multi-party potentially responsible parties (PRPs).