Abstract
Abstract The impoundment of the Taft and Ely rivers by Cardiff Bay Barrage will cause a groundwater level rise of varying amounts within South Cardiff, including the Grangetown Gasworks site. Concern regarding the contamination risk to groundwaters and surface water at and in the vicinity of the gasworks site, resulting from a change in groundwater levels due to the barrage impoundment, resulted in the need for further site investigation to provide more precise information for hydrogeological analysis. This paper outlines the site investigation and groundwater studies undertaken, identifies the existing pollution and contamination hazards at the site and evaluates the subsequent risk resulting from an increase in groundwater levels.
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