PAS 128 Survey Type A (Verification)

What is a PAS128 Survey Type A (Verification)?

As defined in PAS128 it is: “The process of exposing a utility and subsequently measuring and recording its accurate location as well as other relevant attributes”

Survey Type A may require ground excavation to expose and locate utilities.

Why would I consider requesting a PAS128 Survey Type A?

Some of the main reasons for undertaking Survey Type A are:

• To confirm the exact location of utilities within the site area.
• To identify any unknown ground anomalies identified within the site area while carrying out PAS 128 Survey Type B.
• To aid with HSG47 compliance if any ground excavations are required within close proximity to any utilities.

Methodology

Survey Type A is achieved by visual inspection of the utilities this can be achieved by 2 methods

• By opening/lifting of manhole covers and inspection chambers to visually verify chamber size, pipe size and depths to utility.
• Trial hole/slit trench excavation to expose buried utility at critical locations within the survey area.