Fukushima plant is pumping "clean" water back into the Pacific Ocean?

Hmmm not sure about this one here...
Is this groundwater that is being released really "clean" I would think that it would be somewhat "tainted" wouldn't you? 
And the most recent update states that Japan's nuclear regulator has signed off on plans to construct an underground ice wall around the decommissioned Fukushima nuclear power plant.
I understand that the plan to create a frozen ice wall will slow down the spillage and radioactive build-up... but I am curious as to what the next plan of action will be if the ice wall is a success? If!
Sending lots of love to Japan...kinda of sucks because I once dreamed of visiting Japan but this mess has me questioning whether or not Japan is still in my top 5 countries to visit.

via Reuters

"Tepco said 560 tonnes of groundwater captured and stored before it entered the basements is to be released on Wednesday, using a bypass system that funnels it toward the sea after checking for radiation levels. Using the bypass, Tepco hopes to divert on average 100 tonnes of untainted groundwater a day into the ocean."
via Reuters
via CNET

"Japan intends to move forward with an ambitious plan to freeze the ground around its damaged Fukushima nuclear plant, creating a so-called underground ice wall to prevent water that's been contaminated with radioactive materials from escaping and entering the broader water supply. Japan adopted the plan in September of last year, and the AFP reports that its nuclear regulator has now approved it, with construction scheduled to start next month.
The project intends to freeze the ground around four reactors, as well as other related buildings, at Fukushima down to a depth of nearly 100 feet. In total, the frozen wall of earth will stretch for nearly nine-tenths of a mile and is meant to reach temperatures of minus 40 degrees Fahrenheit (minus 40 degrees Celsius). A series of pipes carrying coolant will be used to freeze the land. Beyond preventing water from escaping the area, the AFP reports that the hope is that it will also prevent water from flowing into the plant from nearby hillsides. Construction is expected to finish in March of 2015 and cost about 32 billion yen ($314 million)"
via theverge