1. Case S-4_SRS Par Pond1 Case Study 4: CERCLA INTERIM ACTION AT THE SRS PAR POND

2. Case S-4_SRS Par Pond2 CERCLA Interim Action at Par Pond CERCLA Interim Action at Par Pond provides:  An analysis of interim action options at the Savannah River Site (SRS)  A description of the data gathering process  An example of how to address CERCLA requirements

3. Case S-4_SRS Par Pond3 The Par Pond The Par Pond The cooling water reservoir for two nuclear reactors at the SRS was contaminated with low levels of radioactive isotopes and other hazardous substances.

4. Case S-4_SRS Par Pond4 The Par Pond The water level for the Par Pond was lowered by 19 feet due to concerns over the structural integrity of the earthen dam containing the reservoir.

5. Case S-4_SRS Par Pond5 The Par Pond

6. Case S-4_SRS Par Pond6 Lowering the water level:  Exposed over 1,300 acres of contaminated sediments  Triggered the need for a CERCLA interim remedial action The Par Pond

7. Case S-4_SRS Par Pond7 The Par Pond Risk assessments were conducted to evaluate:  Potential ecological hazards, or  Human health hazards from the exposed contaminated sediments

8. Case S-4_SRS Par Pond8 The Par Pond A feasibility study (FS) was initiated to develop and evaluate possible remediation alternatives.

9. Case S-4_SRS Par Pond9 The Par Pond Alternatives outlined in the FS focused on:  Containment options  Remedial approaches that would mitigate potential hazards from the exposed sediments

10. Case S-4_SRS Par Pond10 The Par Pond This example illustrates the overall objective of the RI/FS process, which is to support an informed risk management decision concerning the most appropriate remediation option for a given site.