Groundwater Record of Decision (ROD)

DOE published a Record of Decision (ROD) outlining planned groundwater remediation activities at the site.  The ROD describes monitoring and treatment approaches tailored to address the contaminants and potential impacts in each affected area of the site, as well as interim actions

Groundwater Interim Measures (GWIM) Implementation Plan

This work plan addresses Groundwater Interim Measures for the groundwater impacted location within the Area IV Former Sodium Disposal Facility (FSDF) to be implemented by DOE. DOE GWIM Work Plan

Groundwater Work Plan

This work plan presents the rationale and approach to data collection activities for portions of Area IV that are the responsibility of DOE. DOE Groundwater Area IV GW RI Work Plan

Groundwater Monitoring at SSFL

Groundwater is monitored for both radiological and chemical contaminants at and surrounding SSFL in approximately 300 groundwater wells.

Complete results of all historical radiological data are provided in Appendix E of the 2009 Annual Report.

Gross alpha, gross beta

Table E-I


Table E-II

Man-made beta/gamma emitting radionuclides

Table E-III

Naturally occurring gamma emitting radionuclides

Table E-IV

Specific radionuclides including strontium-90, radium-226, radium-228, uranium-234, uranium-235, uranium-238, thorium-228, thorium-230, thorium-232, plutonium-238, plutonum-239/240 and americium-241

Table E-V

Tritium in Groundwater

In 1989 tritium was initially discovered in groundwater in several locations of Area IV.  The data was presented in the quarterly and annual grounwater monitoring reports and the Annual Site Environmental Monitoring Reports (ASERs).

A study of the potential sources of tritium was conducted.  Building 4010, the site of a SNAP reactor, was determined to be the most likely source of tritium.  Other potential sources were identified as the SRE, Buildings 4024, 4028, and 4059.

In 2004, a series of groundwater wells were installed to retrieve samples from the potential sources of tritium.  Tritium was found in several wells surrounding the location of the former Building 4010, confirming the earlier study.

The status of tritium in groundwater has been presented in the various DOE public meetings, most recently at the June 2006 public meeting .

Seeps Sampling

This Memorandum documents the results of sampling seep monitoring probes conducted by CDM Smith for DOE April 4 to April 20, 2016.

Tech Memo DOE Area IV 2016 Seep Probe Sampling Results