Contamination in a drainage ditch that still runs to the sea saw a considerable spike. The levels went from 19 bq/liter before the typhoon to 1400 bq/liter after the typhoon. These readings were for beta radiation including strontium 90. Rainwater released from tank weirs during the typhoon had lower levels of radiation leaving TEPCO to assume this was not related to that release. Spikes in various locations along the drainage ditch have been found before with the assumption at least some of this is coming from the multiple tank leaks on the hill.
The drainage ditches at the plant have continued to be a source of unrestricted leaking to the sea. A pair of these ditches exist at the plant with one running on each end of the reactor blocks. While the ditches are somewhat removed from the reactor area they do still channel surface water from the plant directly to the sea.
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