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Groundwater Contamination Remediation Overview - City Council Meeting (October 6, 2008)

The City Council Meeting on October 6, 2008, covered essential findings and plans related to groundwater contamination from a former Spellman Engineering site. Key points included no current human exposure, the contaminated groundwater plume affecting 40 acres, and the threat to municipal supply wells. The proposed remediation involves natural attenuation monitoring and engineered remedies, focusing on achieving stringent cleanup goals. Funding options and community preferences for site management were discussed, emphasizing the EPA's ongoing leadership in these efforts.

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Groundwater Contamination Remediation Overview - City Council Meeting (October 6, 2008)

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  1. City Council Meeting October 6, 2008 William C. Denman, P.E. Remedial Project Manager Denman.Bill@epa.gov (404) 562-8939 Former Spellman Engineering Site

  2. Background – RI/FSExtent of Ground Water Contamination

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

  4. 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

  5. Conceptual Remediation Plan

  6. 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

  7. Remedial Action Funding • Remedial Action - Funding Options • NPL Listing and Superfund financing based on site prioritization (risk-based) • Voluntary cleanup • City of Orlando and the local community indicated a strong preference for pursuing an approach that would keep the properties off the National Priorities List. • EPA supported this approach. • Superfund Redevelopment Initiative • 2002 Amendments to CERCLA

  8. EPA’s Role in the Cleanup • EPA will remain the lead agency with FDEP support throughout • EPA oversight throughout cleanup and approval for completion

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