This July, the groundwater was taken in the seaside of Reactor 2.
Last week, the highest density of All β nuclide to include Strontium-90 and Cs-134 were also measured from another boring in the same area.
(cf, Highest density of All β and Cs-134 measured from groundwater near Reactor 2 http://fukushima-diary.com/2014/07/highest-density-%CE%B2-cs-134-measured-groundwater-near-reactor-2/)
The highest reading that Tepco announced today was 116,000 Bq/m3 (Cs-134 / 137) . The previous highest reading was 9,600 Bq/m3.
Tepco is struggling to stop contaminated water spreading by building frozen water wall, however the actual contamination doesn’t seem to stop at all.
See also.. 2,700,000,000 Bq/m3 of Strontium-90 measured from groundwater nearby Reactor 2 [http://fukushima-diary.com/2014/07/2700000000-bqm3-strontium-90-measured-groundwater-nearby-reactor-2/