Need to know the safe distance between septic tank and sump in a house

Greeting,

   While I understand its always better to keep maximum distance between Septic tank and Sump ( RCC with water proofing), in practice for my home, I can afford to only keep them 4ft to 5ft. Is this good or is there any advise/practice of how to do things better in this situation?

thanks in advance

lakshg

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