Sangamo-Weston Inc./Twelve-Mile Creek/Lake Hartwell PCB Superfund Site

State TrusteeState of Georgia
State TrusteeState of South Carolina
Federal TrusteeDepartment of Defense
AO Bureau

Also Known As


Incident Type



South Carolina

Case Status



Twelve-Mile Creek, Lake Hartwell


Contaminants of Concern Include

Affected DOI Resources Include

Migratory Birds

Financial Summary

Restoration Funds Collected:


*Restoration Funds Allocated:


*Restoration Funds Remaining:


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Case Description

Twelvemile Creek flows southwest to Lake Hartwell through Pickens County, South Carolina. A narrow riverine channel, the creek has steep, heavily vegetated shorelines. Approximately seven miles upstream from Lake Hartwell, the lower portion of Twelvemile Creek contains three impoundments, each associated with a dam (Easley-Central, Woodside I, and Woodside II dams from upstream to downstream).

The presence of PCBs in Twelvemile Creek/Lake Hartwell was discovered when surface water, sediment, and fish from the area were sampled in the mid-1970s. The source of this contamination was determined to be the Sangamo-Weston, Inc. capacitor manufacturing plant in Pickens, South Carolina.

Sangamo-Weston, Inc. operated the plant from 1955 to 1987. The liabilities associated with that operation were subsequently assumed by Schlumberger Technology Corporation (STC). Dielectric fluids, used in the manufacture of capacitors until 1977, contained PCBs, and materials containing these fluids were disposed via land burial. In addition, PCBs were present in discharges from the plant to Town Creek (a tributary of Twelvemile Creek). Surface water and sediment contaminated by the discharged PCBs eventually migrated downstream to Twelvemile Creek and Lake Hartwell.

Woodside II Dam scheduled to be removed to restore free-flowing Twelve Mile Creek, Credit: Industrial Economics Inc

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Case Documents

 Document TypeDocument NameDocument Date


 Factsheet Fact Sheet  


 RCDP Restoration Compensation and Determination Plan 03/14/2006


 Consent Decree Consent Decree 01/09/2006

Map View

Case Contact

South Carolina Ecological Services Field Office

Charleston, SC | (843) 727-4707 |

Case Trustees

AO Bureau
Federal TrusteeDepartment of Defense
State TrusteeState of Georgia
State TrusteeState of South Carolina

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