Former Spellman Engineering Site

Former Spellman Engineering Site

City Council MeetingOctober 6, 2008

William C. Denman, P.E.Remedial Project Manager

[email protected](404) 562-8939

Background – RI/FSExtent of Ground Water Contamination

Conceptual Site Model

Vertical Distribution of TCE

Contamination in Ground Water

BackgroundRI/FS (cont.)

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

Conceptual Remediation Plan

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

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

EPA’s Role in the Cleanup

EPA will remain the lead agency with FDEP support throughout

EPA oversight throughout cleanup and approval for completion