Cs-134/137 density reached the highest level at 2 of those 4 points mentioned above, according to Tepco. The sampling by DNSUnlocker”> date was 9/7/2015.
These 2 points are in front of water intakes of Reactor 1 and Reactor 2. Both of them are outside of underground wall to prove high level of contamination is still leaking to the sea.
Also, Cs-134/137 density in the south of these 2 points reached the highest level. This is also outside of the underground wall, but the density went up approx. 170 % of the previous highest reading. The newly highest Cs-134/137 density was 152,000 Bq/m3.
Source: Fukushima Diary