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Remediation and Redevelopment Update: Former Spellman Engineering Site, March 2008

This report provides an update on the remedial efforts at the Former Spellman Engineering Site, focusing on groundwater contamination issues and cleanup strategies. Key findings include no actual human exposure to contaminated groundwater and potential threats to nearby municipal supply wells. A combination of engineered remedies, including ISCO and bioremediation, is outlined for addressing TCE concentrations. Community partnerships and funding options for the cleanup are emphasized to expedite redevelopment while ensuring environmental safety and compliance.

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Remediation and Redevelopment Update: Former Spellman Engineering Site, March 2008

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  1. Project Update Meeting March 18, 2008 William C. Denman, P.E. Remedial Project Manager Denman.Bill@epa.gov (404) 562-8939 Former Spellman Engineering Site

  2. Former Spellman EngineeringBackground - Location Release Location

  3. Background – RI/FSExtent of Ground Water Contamination

  4. Background RI/FS (cont.) Conceptual Site Model Vertical Distribution of TCE Contamination in Ground Water

  5. Background - RI/FS (cont.)Key Findings • No actual human exposure to contaminated ground water is occurring • The ground water plume underlies approximately 40-acres • Migration to the Floridan aquifer potentially threatens nearby municipal supply wells • Contamination can be addressed through an engineered remedy

  6. Cleanup ApproachSource and Highly Impacted Areas • Surfactant enhanced in situ chemical oxidation (ISCO) of source area (TCE concentrations >100,000 ug/L, darkest area on map) • ISCO of highly impacted zone (TCE concentrations between 10,000 and 100,000 ug/L, adjacent to darkest area on map)

  7. Cleanup ApproachDilute Ground Water Plume • Enhanced in situ bioremediation of groundwater with TCE concentrations >2,000 ug/L • Partial enhanced in situ bioremediation of groundwater with TCE concentrations >300 ug/L ISCO (TCE >10,000 ug/L)

  8. Cleanup ApproachPost-Active Treatment • Natural attenuation monitoring until cleanup goals are met • TCE: 3 ug/L • DCE: 70 ug/L • VC: 1 ug/L • Five-year reviews of remedy until cleanup goals are met • Attains Unrestricted Use/Unlimited Exposure Criteria

  9. Former Spellman EngineeringRemedial Design/Remedial Action • ROD signed September 23, 2004 • Remedial Design • Start in October 2004 • Treatability Studies to refine remedial technologies • Remedial Action - Funding Options • NPL Listing and Superfund financing based on site prioritization (risk-based) • Third-party cleanup

  10. Remedial Action Funding • City of Orlando and the local community indicated a strong preference for third-party cleanup using a property divestiture, cleanup, and redevelopment approach. • Keep properties off the National Priorities List • Expected to reach cleanup faster • EPA supported this approach. • Superfund Redevelopment Initiative • 2002 Amendments to CERCLA

  11. Lake Highland Cleanup Program Elements • Region 4 - Bona Fide Prospective Purchaser Agreement (BFPP) • Prospective Purchaser to Perform Cleanup under EPA oversight. • Release of any EPA Liens • FDEP - Brownfield Site Rehabilitation Agreement (BSRA) • Cleanup Liability Protection • Lender Liability Protection • Voluntary Cleanup Tax Credit (VCTC) • Deduct up to $500,000 per year • 25% bonus for Site Rehabilitation Completion • Credits are transferable

  12. Private Partner Property Development Site Cleanup CLEANUP REDEVELOPMENT BFPP AGREEMENT PURCHASE & SALE AGREEMENT BSRA City of Orlando FDEP FL Brownfields EPA Superfund Public/Private Partnership Record of Decision ARCADIS CLEANED UP SITE & REDEVELOPED PROPERTY

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