Dear Glory Danjuma You can check links below

https://doi.org/10.1016/j.gsd.2019.100276

10.1007/s00254-005-0104-1

https://www.e3s-conferences.org/articles/e3sconf/pdf/2020/60/e3sconf_icst2020_02012.pdf

Regards

Please refer to the attached interesting document that may be helpful.

Regards

Generally speaking, shallow aquifers, and phreatic aquifers are more easily polluted than deep and confined aquifers. The methodologies to find out the vulnerability of an aquifer depands on the hydrogeological conditions of your area of concern. For example, if your site is close to the landfill, or if your aquifer is fed by the river that is polluted, or if your well field is near a oil field-related operation including transportation pipelines, and so on, you would have different methods to use. There are novel developments in these relevant methods to consider. Generally speaking, it is useful to apply novel groundwater dating tools to find out how vulnerable your aquifer is regarding pollution as well as the baseline of water quality parameters.

Hope you find these useful. Good luck!

Monitoring the distances to pit latrines. You can look at some of my work here. If you need help you can contact me.

Article Assessment of water quality in selected shallow wells of Kei...

http://www.academicjournals.org/journal/IJWREE/article-full-text-pdf/8265FB32599/