900ft deep borewell within 1 feet of septic tank : Need advice regarding feasibility and solutions

I am planning to dig a borewell, depth approximately 900 ft.  Geologist has suggested the selected spot for water availability. But we have a septic  water collection tank with cement rings installed which is approx. 20 ft deep & 5 ft circumference where the bottom is not lined with concrete. The bore well point that we have got is just 1 ft from the pit..

Can we go ahead with the borewell? If not what are the possible solutions?

Ranjan
ranjan_coorg2000@yahoo.com

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