Permeable paving provides the surface water drainage problem for contaminated ground on this housing development.

The site at Ruston Way presented more than its fair share of problems for the developer, Westleigh Developments. Given that the former industrial site that Westleigh inherited contained a mixture of contaminants including casting sand, heavy metals, phosphorus and various salts, the strategy for dealing with surface water run-off had to be fool proof in order to avoid pollution. So, the site is subtended by a polythene layer to prevent surface water run off from entering the subgrade and leaching out pollutants into the water course.