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should the construction site be at ground level or below ground level for easy gas flow.?

Biogas-Plant Material-required-to-construct-a-Biogas-plant 07-08 min 40-50 sec 21-04-20, 6:19 p.m. dindigul

Answers:

Please watch the Spoken Tutorial -

Laying the foundation
https://spoken-tutorial.org/watch/Biogas+Plant/Laying+the+foundation/English/
21-04-20, 6:53 p.m. bellatony911

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Below ground level
21-11-23, 3:05 p.m. lingalapreethichikkidarathi

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Below ground level 
21-11-23, 3:06 p.m. Chikkisrivatsarichkidopreethi

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