San Jose Navigation GPS Mobile Locator GM-158-USB Manual de usuario Pagina 34

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34
Figure 5.4 Comparison of large anomalies vs. small anomalies.
Fig. 5.5 Cross section/profile of a void under the road. A dip in the road
was the first indication that there was something wrong. The GPR profile
reveals the void above the drainage culvert.
20,000gal UST’s
4” Gas Line
Possible Utilities
Void under the Road
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