Need help in planning for a borewell in a rocky area in Gottigere,Bangalore-Need contacts of geologists to locate water points

I own a 30 by 40 site in Gottigere, Bangalore and am planning to build a house here. I need to dig a bore well in this site, which is located on a small hill, but not hard rock. 100 mts from my site is a small mountain which extends upto 1/2 km.

What are the major items I should consider before I hire a person for a bore well? I also need a geologist who can locate the water points in my site. Any references in Bangalore would help me a lot.

Thanks 

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