Can I dig a borewell near chemical factory in Pimpri, Pune - How deep should I dig and what are new ways to search water source points ?

I want to dig a borewell in Pimpri, Pune.  There is a chemical factory near by, is it advisable?

How deep should I dig and what are the new ways for searching a point where I could get water? Which is the best season to dig a borewell and what ways should I follow to keep refilling it? Please suggest because I am a novice.

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