Final Second Five-Year Review Report Fort Ord Superfund Site ...

1.0 ISSUES
FIVE-YEAR REVIEW SUMMARY FORM
The following sections summarize the issues identified during the five-year review. A listing of the
issues is presented in Table 1.
1.1 OU 1
Trichloroethene (TCE) in groundwater has been identified outside the capture area of the Operable Unit 1
(OU 1) remedy. TCE above the aquifer cleanup level is present off site in a narrow plume extending
approximately 400 feet downgradient of the existing line of extraction wells (EW) located at the former
Fort Ord property boundary. Concentrations of TCE in downgradient locations exceed the aquifer
cleanup levels specified in the OU 1 Record of Decision (ROD) and will require remediation to be
compliant with the ROD objectives and applicable or relevant and appropriate requirements (ARAR).
1.2 OU 2
1.2.1 Landfill Cap
The landfill has not been closed, but an impermeable cover has been placed on each of the cells where
wastes were placed. Final closure of the landfill is scheduled after excavated soil from Site 39 is placed
within Cell E of the landfill.
1.2.2 Groundwater Treatment
The expanded Operable Unit 2 (OU 2) groundwater remedy is operating at the designed flow rates.
Based on monitoring performed since system modification, it appears to have achieved hydraulic capture
of the groundwater containing Containment of Concerns at concentrations above aquifer cleanup levels
except at the eastern edge of the plume where two additional wells have been installed for capture. The
groundwater contaminant mass within the hydraulic capture area is expected to be adequately addressed
by the existing remedy.
1.4 Site 31
U.S. Environmental Protection Agency (EPA) and the Department of Toxic Substances Control (DTSC)
concurred that no further remedial action is necessary in letters dated September 20, 1999, and June 28,
2006, respectively. In its letter, the DTSC requested long-term management in the form of a land use
covenant prohibiting excavation, exposure of the soil, or use of the area as part of any residential
development be completed on a section of the site on the north face of the ravine and under the power
transmission lines. At DTSC’s request, a covenant to restrict use of property (CRUP) is being prepared.
1.5 Site 39
Based on the results of the Basewide Range Assessment and the Ecological Risk Assessment (ERA)
additional areas have been proposed for remediation. The proposed volume of soil to be excavated has
increased substantially and will require a ROD Amendment for the Site 39 section of the Basewide
Remedial Investigation (RI) Sites ROD. In addition, seven ranges within Site 39 cannot be investigated
until the munitions and explosives of concern (MEC) removal is complete.
Final
SF-2
FORMER FT ORD 5YR REVIEW 2007_FINAL United States Department of the Army