PAS 128 Survey Types
PAS 128 defines several survey types, each with a different level of accuracy and method used:
- PAS 128 Type A: Verification Survey
- Involves physically exposing the utility to verify its position and characteristics.
- Provides the highest level of accuracy.
- PAS 128 Type B: Detection Survey
- Uses geophysical techniques such as Ground Penetrating Radar (GPR) and electromagnetic location.
- Sub-divided into four sub-types (B1, B2, B3, B4) based on the density and confidence of detected utilities.
- PAS 128 Type C: Site Reconnaissance Survey
- Requires gathering existing records and visible surface features to approximate the location of utilities.
- Provides less accuracy compared to Type A and B.
- PAS 128 Type D: Desktop Utility Record Search
- Involves collecting and reviewing existing utility records without any on-site activities.
- Provides the least accuracy, based on historical and available data.
PAS 128 Survey Accuracy
The accuracy of the survey results is classified into four quality levels (QL):
- QL-A: The highest accuracy, obtained from Type A surveys.
- QL-B: Accuracy from Type B surveys, with QL-B1 being the most accurate within this type.
- QL-C: Results from Type C surveys.
- QL-D: Least accurate, based on Type D surveys.
PAS 128 Survey Applications
- Construction and Excavation Planning: Helps in reducing the risk of utility strikes and ensures safe excavation practices.
- Asset Management: Aids utility companies in managing and maintaining their underground infrastructure.
- Urban Development: Supports planners and developers in understanding the subsurface environment.
PAS 128 Process
- Preparation: Define the scope, objectives, and area of the survey.
- Data Collection: Conduct the survey using the appropriate methods and technologies.
- Data Processing: Analyze and interpret the collected data.
- Data Presentation: Present the findings in a clear and standardized format, including maps and reports.
PAS 128 Benefits
- Improved Safety: Reduces the risk of accidents caused by striking buried utilities.
- Cost Efficiency: Helps in avoiding costly utility damage and project delays.
- Better Planning: Provides accurate information for project planning and design.
PAS 128 ensures that underground utility surveys are conducted in a consistent manner, improving the reliability and accuracy of the data collected. This specification is essential for anyone involved in construction, civil engineering, or utility management.
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