You may find this chapter on groundwater from WHO's "Water Quality Assessments - A Guide to Use of Biota, Sediments and Water in Environmental Monitoring - Second Edition" useful: http://www.who.int/water_sanitation_health/resourcesquality/wqachapter9.pdf
And chapters 10 & 11 of Michael Price's Introducing Groundwater: http://books.google.mu/books?id=G0mN7qi1jdIC&pg=PA144&source=gbs_toc_r&cad=4#v=onepage&q&f=false
The Rural Water Supply Network has a good selection - http://rural-water-supply.net/en/resources/sort/year-desc/filter/2_34
And just to add, there is some excellent work being undertaken by a number of organisations in the area of Community Based Water Resources Management which in some case includes groundwater monitoring. Links below: http://www.ice.org.uk/ICE_Web_Portal/media/Ecomms/managing_water_locally.pdf and http://www.wateraid.org/~/media/Publications/strengthening-WASH-services-and-community-resilience.ashx
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