C - Hanford Site

WHC-SD-EN-TI-136, Rev. 0
RL--WHC-WHC600EM- 1990-0337 10 Day Update
UNOFFICIAL COPY (Incomplete)
OCCURRENCE REPORT
17. ACTIVITY CATEGORY
18. IMMEDIATE ACTIONS TAKEN AND RESULTS
Sampling was completed, then additional sampling was
conducted to determine how deep the contamination
penetrated, this sampling revealed that the contamination
had not penetrated below four inches from the bottom of the
tank. Hanford Surplus Facility Program Office (Mike
Mihalic) was notified of the leak at 1400 hours December 18,
1990. The Programs Office notified Environmental
Protection. As this project is being performed under
approved decommissioning work procedures, and it had been
anticipated that the soil contamination could/would be
found, this Occurrence Report is submitted for notification
purposes. A complete detailed report will be prepared and
submitted upon completion of the sample analysis. By copy
of the unusual occurrence report, Environmental Engineering
is requested to perform the necussary evaluation,
notification, and remedial action as required by 40 CFR
280/281.
19. DIRECT CAUSE
20. CONTRIBUTING CAUSE(S)
21. ROOT CAUSE:
22. DESCRIPTION OF CAUSE
From reconstructing the most likely cause of the
contaminated soil found during the removal of tank IOON-27,
it was observed that the tank condition did not indicate the
tank to be a leaker. There has been one reportable spill at
this location in 1988. It is assumed there have been other
unreported spills at this tank fill location. The gravel
and porous backfill surrounding the tanks creates a natural
pathway for surface spills, to the location where the
contaminated soil was found.
1992/02/27 page 3
C-7