Here is a link to Palisades document dated 5-2-2011  2010 Annual Radioactive Effluent Release and Waste Disposal Report
 
...Effluent Monitoring System Inoperability
The effluent monitors that were out of service for greater than 30 days were:
RIA-2323, B steam generator main steam line monitor, was out of service
from March 28, 2010, to July 26, 2010 (120 days). RIA-2327, high range
noble gas monitor, was out of service from July 4, 2010, to
December 15, 2010 (142 days)...
 
http://pbadupws.nrc.gov/docs/ML1112/ML11129A078.pdf
 
 
This link is for the 2011 Annual Effluent Release Report
 
...Additional repair of underground piping was performed during the spring of
2011. The overflow line to T-91 was sleeved to ensure piping integrity. This
line was assumed to be dry, based on all indication, but contained highly
tritiated water of which a small amount was expelled during the sleeving
operation. This resulted in an additional release of tritiated water to the
groundwater which caused spiking in monitoring well 3. This event is further
discussed under section 9 of this report.
Monitoring of the groundwater tritium plume continues in order to determine
repair effectiveness and to ensure the accuracy of the site hydrology.
Depth to Local Water Table
— The depth is approximately eight to nine feet.
Classification of Subsurface Aquifers
— Not used for drinking water.
Expected Movement/Mobility of Groundwater Plume
— Westerly direction
down-gradient toward Lake Michigan at approximately two feet per day.
Land Use Characteristics
— PNP site property, water not used for drinking or
irrigation.
 
http://pbadupws.nrc.gov/docs/ML1212/ML12121A010.pdf
 
 
Then see Enclosure 4 pp 12-14 in this link... http://pbadupws.nrc.gov/docs/ML0621/ML062130102.pdf