ENVIRONMENTAL IMPACT OF A DUMPSITE ON THE GEO ENVIRONMENT USING SOIL AND WATER(EITHER SURFACE OR BOREHOLE WATER)
1.1 Background of Study
The sustenance of life depends greatly on water, therefore, the demand for potable water increases continually in line with world population growth. Recently, many African cities have undergone unprecedented growth in population through migration from rural areas which has led to the growth of cities into sprawling “mega-cities” with large areas of unplanned sub-standard housing with few services. The unplanned expansion of such cities leads to a serious pollution threat to the groundwater and uncontrolled industrial and commercial activity add to the pollution threat (UNEP, 2002). This has been a major problem in developing countries; provision of drinking water has become expensive and difficult. The main source of potable water in many of these cities is groundwater, commonly from shallow hand-dug wells and deeper water supply boreholes. In Nigeria, like many other developing countries, open waste dumping system has been the major management option of solid waste disposal. In previous years, management system has been based on collection and dumping out of the city boundaries in conformity with the concept of “out of sight out of mind” (Arukweet al, 2012). But in recent times, the siting and development of residential quarters near waste sites are common due to shortage of building land to cope with the increasing rate of migration and consequent population explosion (Ikemet al., 2002).
Dump sites have been identified as one of the major threats to soil and water resources, receiving a mixture of municipal, commercial and mixed industrial wastes. The depressions into which solid wastes are often dumped include valleys and excavations. Studies on the effects of unlined waste dumps on the host soil and underlying shallow aquifers have shown that soil and groundwater system can be polluted due to poorly designed waste disposal facilities (Amadiet al., 2012). Uncontrolled waste dump sites threaten the groundwater supply as movement of leachates from dump sites through the soil and the aquifers pose a risk to the environment and human health. Waste placed in dump sites or open dumps are subjected to groundwater under flowor infiltration from precipitation (Moret al., 2006). The presence and potential exposures of the community to groundwater contaminants may contribute to the predilection of human health impacts, from simple poisoning to cancer, heart diseases and teratogenicab normalities (Su, 2008).