I don't see how that constitutes proof that shale mining readily pollutes groundwater.

Water Quality Impacts
Runoff from mining and retorting operations can
impact surface and groundwater. In-situ operations
pose greater risks to groundwater quality. Controls
will be required to protect surface and groundwater.

Effective technologies and management processes
already exist and have been demonstrated in other
commercial-scale mining and chemical processing
applications.

In-situ processes have been particularly challenged
to protect groundwater from contamination by
kerogen oil or other produced gases and sediments.

Promising freeze-wall technologies are being tested
to isolate ground water from subsurface in-situ
processing areas until post-production flushing and
clean-up of the heated areas has been completed.

Surface runoff can be managed as established in other mining operations. As for groundwater, while challenged, promising technologies are being tested.

What am I missing?

>See this doc from the Dept. of Energy http://www.fossil.energy.gov/programs/reserves/npr/Oil_Shale_Environmental_Fact_Sheet.pdf
>
>>Please provide documented proof that shale mining readily pollutes groundwater.