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You may like to look at the WELL factsheet on on-site sanitation in areas with high groundwater: https://www.lboro.ac.uk/well/resources/fact-sheets/fact-sheets-htm/lcsahgt.htm
I also attach a final (but yet to be approved) DRAFT of three WHO factsheets on rehabilitating wells and boreholes that WEDC has helped to produce. I'll give you a web-link to these when we put them up on our website.
Brian Skinner