1. British Standards Institution: 1988, DD 175:88.
2. Dept of the Environment: 1981, Building Research Establishment Digest No. 250.
3. Dept of Environment: 1987a, Guidance on the Assessment and Redevelopment of Contaminated Land. Interdepartmental Committe on the Redevelopment of Contaminated Land ICRCL 59/83.
4. Dept of Environment: 1987b, Problems Arising from the Redevelopment of Gasworks and Similar Sites, Environmental Resources Ltd., Harwell.
5. Dutch Criteria for Contaminated Land: 1991, Technical Report D205.