Zee News 
August 12, 2013
Tokyo: Tokyo Electric Power Co. has said that it has found raised levels of radioactive tritium in groundwater sample collected from a newly built observation well by the Pacific Ocean near the crippled Fukushima No. 1 nuclear power plant.
The levels of tritium in the groundwater sample collected from the well have risen to 34,000 becquerels per liter in last four days, the Japan times reports.
Earlier, 23,000 becquerels of tritium were detected in the sample collected on Thursday, after the well was installed for the reactor no. 1 some 4 meters away from the sea.