The Effects of Groundwater Flow Pattern on the Concentration of Soluble Sulphates

The results of site investigations carried out at two sites in Lancashire, England are presented. Both sites comprised virgin glacial deposits, one overlaid with chemical waste, the other with colliery waste. The pattern of groundwater flow was established showing, a water table close to and just above the original ground surface and flowing along the original sloping topography. The results of sulphate content and pH tests in groundwater samples are given and show the effect of increasing concentration of soluble contaminants in the direction of groundwater flow. The results are discussed and comments made on the effects of this phenomenon on the deterioration of concrete placed within the site.