First evidence of Groundwater contamination?
Says "well" water is contaminated starting from June 6th report. Was it reported earlier as well??
http://www.jaif.or.jp/english/news_images/pdf/ENGNEWS01_1307421348P.pdf
Radioactive materials in the ground
water:
Radioactive iodine, I-131, and cesium, Cs-134, 137, were detected from the subdrain, underground water collected and controlled in the
facility, and the well water in the Fukushima Daiichi site. [4/7-]


Been reporting it for a while now.
In the subdrainage and underground water since 3/30:
http://www.jaif.or.jp/english/news_images/pdf/ENGNEWS01_1301624548P.pdf
"Radioactive materials were detected from the subdrainage sampled near the turbine buildings at Fukushima Dai-ichi NPS on Mar. 30th"
http://www.jaif.or.jp/english/news_images/pdf/ENGNEWS01_1301737920P.pdf
"Radioactive materials were detected from underground water sampled near the turbine buildings on Mar. 30th"
I don't know what their definition of "underground water" is in this case.