[1] A. O. Akankpo, G. T. Akpabio and I. O. Akpabio, “Phy- sicochemistry and Biological Properties of Ground-Water Samples from Boreholes Sited near Waste Dumps in Uyo, Southwestern Nigeria,” Natural and Applied Sciences Journal, Vol. 10, No. 2, 2009, pp. 156-165.
[2] C. C. Asonye, N. P. Okolie, E. E. Okenwa and U. G. Iwuanyawu, “Some Physio-Chemical Characteristics and Heavy Metal Profile of Nigeria Rivers, Streams and Wetlands,” African Journal of Biotechnology, Vol. 6, No. 5, 2007, pp. 617-624.
[3] A. N. Amadi and P. I. Olasehinde, “Application of Re- mote Sensing Techniques in Hydrogeological Mapping of parts of Bosso Area, Minna, North-Central Nigeria,” International Journal of the Physical Sciences, Vol. 5, No. 9, 2010, pp. 1465-1474.
[4] A. O. Akankpo and M. U. Igboekwe, “Monitoring Ground- Water Contamination Using Surface Electrical Resistivity and Geochemical Methods,” Journal of Water Resource and Protection, Vol. 3, No. 5, 2011, pp. 318-324. doi:10.4236/jwarp.2011.35040
[5] A. N. Ugbaja and A. E. Edet, “Groundwater Pollution near Shallow Waste Dumps in Southern Calabar, South- Eastern Nigeria,” Global Journal of Geological Sciences, Vol. 2, No. 2, 2004, pp. 199-206.
[6] A. E. Edet and C. S. Okereke, “Delineation of Shallow Groundwater Aquifers in the Coastal Plain Sand of Cala- bar Area Using Surface Resistivity and Hydro-Geologi- cal,” Journal of African Earth Sciences, Vol. 35, No. 3, 2002, pp. 433-441. doi:10.1016/S0899-5362(02)00148-3
[7] WHO, International Drinking Water Standards, 3rd Edi- tion, WHO, Geneva, 2007.
[8] WHO, Background Document for Development of WHO Guidelines for Drinking Water Quality, 3rd Edition, Ge- neva, 2004.