In the authors experience, the most efficient survey program for a location where no accurate utility information is available is to use EM for an initial search, then use GPR to refine the data in areas where EM indicated conductivity anomalies.
A magnetic plastic gas pipe has been developed under the auspi
ces of the Gas Research Institute, and is currently being evaluated under field conditions. If the durability of the material lives up to expectations, and the cost becomes competitive with current gas line products, location of the new lines will be greatly simplified, and current utility location tools will become much more useful.
Choose one phrase from the List of phrases to complete each Key point below.
The information in the completed sentences should be an accurate summary of the points made by the writer.
NB. There are more phrases than sentences, so you will not need to use them all. You may use each phrase once only.
Key point
1. Utility companies
2. Trial pits
3. Mechanical digging equipment
4. Geophysical survey methods
5. GPR
6. EM conductivity survey
7. The development of a magnetic plastic gas pipe
List of phrases
A. dig holes to bury utility lines
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