A Practical Guide For Underground Services Location and CCTV Drainage Surveys

The Royal Institution Of Chartered Surveyors. Survey Of Land, Buildings And Utility Services At Scales Of 1:500 And Larger

All work is carried out to the RICS specification, and we would recommend this specification as a useful tool to help you specify your exact requirements.

It is important you read their preamble, which is printed below, that highlights the possible incompleteness of electronic tracing.

Electronic Tracing: This is a more reliable method of locating buried services. On heavily built-up sites 85% completeness is probably all that can be expected. Plan accuracies of the order ±150mm may be achieved but this figure will depend on the depth of the service below ground level. Where similar services run in close proximity, separation may be impossible. Successful tracing of non-metallic pipes may be limited (due to technology available at the time of publication of this specification).
Electronic tracing is relatively expensive. In the case of development sites it is more economical to indicate those areas where excavation will take place and concentrate there.

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