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Landfill: Difference between revisions
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The underlying geology and hydrogeology of a landfill is especially significant if there is an '''aquifer''' that is relied upon for drinking water or other extraction purposes. One definition of aquifer is from Freeze and Cherry (1979): “''An aquifer is best described as a saturated permeable geologic unit that can transmit significant quantities of waste under ordinary hydraulic gradients''”. | The underlying geology and hydrogeology of a landfill is especially significant if there is an '''aquifer''' that is relied upon for drinking water or other extraction purposes. One definition of aquifer is from Freeze and Cherry (1979): “''An aquifer is best described as a saturated permeable geologic unit that can transmit significant quantities of waste under ordinary hydraulic gradients''”. | ||
In | In England and Wales, the [[EA]] categorize aquifers to be consistent with the [[Water Framework Directive]]. The categories are Principal Aquifer, Secondary Aquifer and Unproductive Strata. Previously the phrases major aquifer and minor aquifer were utilized. Similar arrangements exist in Scotland and are supervised by [[SEPA]]. In locating landfills, consideration is given to aquifers in terms of their Source Protection Zoning (see below). | ||
The relevance of the hydrogeological setting within which a landfill is located arises from the need to assess the technical precautions and engineering requirements for a landfill to be authorized such that unacceptable environmental impacts are prevented. This assessment is undertaken via a '''Hydrogeological Risk Assessment''' ('''HRA'''); this is submitted as supporting document to an [[Environmental Permit]] application and takes a risk based approach to the location of the landfill and the engineering required. Again, similar arrangements are in place in Scotland, Wales and Northern Ireland. | The relevance of the hydrogeological setting within which a landfill is located arises from the need to assess the technical precautions and engineering requirements for a landfill to be authorized such that unacceptable environmental impacts are prevented. This assessment is undertaken via a '''Hydrogeological Risk Assessment''' ('''HRA'''); this is submitted as supporting document to an [[Environmental Permit]] application and takes a risk based approach to the location of the landfill and the engineering required. Again, similar arrangements are in place in Scotland, Wales and Northern Ireland. | ||