What is a PAS128 Survey Type D (Desktop)?
As defined in PAS128 it is to use desktop search techniques to identify existing utility data within the survey area.
Why would I consider requesting a PAS128 Survey Type D?
Survey Type D needs to be carried out prior to any site visits to complete Survey Type C, B and/or A.
The supplied utility survey pack includes a survey extents plan, list of utility owners contacted, all correspondence received from utility owners and a compiled composite plan in a digital model format to clients specified requirements.
Survey Type D is all office based with no requirement for a site visit, so the highest quality level any utility can be given is QL-D following PAS128.