(The post will be updated as the day/night progresses...)
Let's start from the latest...
(UPDATE) TEPCO says they will hold a press conference in J-Village from 3:30PM today (April 10) with TEPCO's president, who will explain the situation of the leak. The regular TEPCO press conference will start one hour earlier, at 4:30PM.
(UPDATE) NHK just reported that radioactive materials detected outside the liners for the pond No.1 was 0.11 Bq/cc (cm3) (or 110 Bq/liter) of radioactive strontium (and others, of course).
Just a headline from Kyodo News (11:27AM 4/10/2013):
TEPCO announced that a very small amount of radioactive materials has been detected outside the liners for the in-the-ground water storage.
No info on which pond, how much.
TEPCO so far has hoped that the leaks in the pond No.3 and the pond No.1 are at the locations where the leak detection pipes stick out, piercing through the HDPE layers. Unfortunately, that is not the case for the pond No.1.
Asahi Shinbun reports (4/10/2013; part):
A new leak was found in the storage No.1. Leaks had been found in the storage No.2 and No.3, and 9,200 tonnes of waste water in the storage No.2 was being transported to the storage No.1 starting April 6.
According to TEPCO, the water between the 3-layer waterproof sheets was tested in the morning of April 9, and found 10,000 becquerels/cm3 of radioactive materials which confirmed the leak of the waste water.
So far, TEPCO had assumed that the leak was from the upper part of the storage, and insisted that they could use the storage as long as the storage was not filled to the top. However, the storage No.1 where the new leak was found was only 50% full. It is now certain that the location of the leak is near the bottom, probably from one of the joints of the liners.
Meanwhile, the Nuclear Regulatory Authority met in the morning of April 10 to discuss the leak problem, but the meeting lasted for only 30 minutes, as there is no effective way to deal with the leak.
Jiji Tsushin reports (4/10/2013; part):
At the meeting, they raised the issues such as demanding TEPCO to build additional storage tanks for the waste water ahead of schedule and pushing for the start of the multi-nuclide removal system [ALPS]. However, there was no effective measure [for the leak], and the meeting was over in less than 30 minutes.
Commissioner Toyoshi Fuketa, who is in charge of the accident response, said "The work is being carried out in an extremely harsh environment", and regretted that he could not give enough warning in consideration for the workers there.