Until last year, probably more than 95% of the people working at Tsukiji thought that they were going to move for sure. But around March of this year, the voice of the Japan Association on Environmental Studies and the Tsukiji Market middlemen became prominent that the new location might be highly polluted. I had also heard about this matter of pollution on the news but I wasnft aware about it that much. I knew a little about 'environmental engineering' and I thought broadly that they would burn the polluted soil or something, get rid of the pollution and relocate anyway.
Then I had the opportunity to attend a press conference about the Tsukiji relocation held at the Foreign Correspondents' Club of Japan--One of my clients that took our Tsukiji Tour was a correspondent and he introduced me into the conference--and I found out that the situation was much more critical than I thought.
After the press conference, I attended a Meeting for Reading Research Papers of the JAES (I had to pay 3000 yen!) and the more I learned about the situation, the more I felt that there was no way to relocate Tsukiji to Toyosu.

I have enormous information I brought from the Press Conference and the Meeting for Reading Research Papers of the JAES, but I will only summarize here what I learnt from them.
The point is that the soils and the groundwater of the Toyosu site are polluted but the TMG doesn't admit it and claims that the site would be safe by the measures they plan to do such as soil replacements and asphalt paving, etc.
On the other hand, the JAES claim that TMG's investigations of pollution and measures are lenient towards the safety of the people.
TMG are refusing further precise investigations by scientists of the JAES.
TMG also apply a law called the Clean Water Law to clear environmental standards, which is not only inappropriate for the Toyosu situation but also illegal.
And talking about laws, a notorious Soil Pollution Measure Law, which is known as the law with no teeth, works in favor of the TMG in terms of clearing environmental standards and concealing the real pollution of the Toyosu site.

One more thing important is that Toyosu is in the danger zone of liquefaction of ground.
It is said that the possibility of an inland earthquake occurring in Tokyo would be 70 percent in the following 30 years. Liquefaction of ground is a result of soil and water that were in a homogeneously state at normal conditions resolving by the energy of earthquakes, and the water spill out to the ground. The Toyosu site was landfilled by the mud they dredged the Tokyo Bay, so the soils contain a lot of water and very easily cause liquefaction. The soils and groundwater were polluted by the Tokyo Gas factory with the by-products such as arsenic, cyanogens and benzene produced in the 20 years from 1956 to 1976, when they manufactured town gas from coil. It can be predicted that by liquefaction of ground, polluted groundwater may break through the quick fix barriers made by the TMG and flood the new Toyosu fish market and run them out of business for a fairly long period of time.