Former Spellman Engineering Site u Project Update Meeting

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

Former Spellman Engineering Background - Location Release Location

Background – RI/FS Extent of Ground Water Contamination

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

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

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

Cleanup Approach Dilute Ground Water Plume u Enhanced in situ bioremediation of groundwater with TCE concentrations >2, 000 ug/L u Partial enhanced in situ bioremediation of groundwater with TCE concentrations >300 ug/L ISCO (TCE >10, 000 ug/L)

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

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

Remedial Action Funding u 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 u EPA supported this approach. » Superfund Redevelopment Initiative » 2002 Amendments to CERCLA

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

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