Ground water contamination
It was about how danger it is if a well is not properly build.
why is grandma sick?
she sick because she drank some contaminated water.
UNfortunately there was a well that was not securely build or maintained so runoff water could get into the well.
when runoff water gets into the well, it can bring bacteria to the water that is being used.
Wells are not safe to use because mining can be a problem too. Coal can get in the underground water when people are mining near a wells.
In grandma case the water was contaminated by coal.
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