SIM, Applied Methods and Practices
The ultimate goal of SIM is to combine the experienced technician with the best technologies available. The importance of experience-based training cannot be understated. The effort and experience of the individual field technician are directly linked to the likelihood of a successful project.
Summary, Experienced-Based Methods in Concrete:
Jobsite hazard analysis performed on site and documented.
- Review locations with site contact.
- Understand the scan goal. What information is needed by the client.
- Understand the details, slab thickness, anticipated structural reinforcement, potential for nonstructural elements and potential hazards on site.
- Prove out the information given by the client with GPR.
- Visual inspection under suspended slabs.
- Use multiple antenna frequencies on slab on grade applications for safe trenching.
- Confirm no energized conduits.
- Mark tops and bottoms of metal decking.
- Isolate conduits through cross-polarizing.
Summary, Experienced-Based Methods for Underground Utility Location:
- Jobsite hazard analysis performed on site and documented.
- Perform site walk with site contact to review scope of work. Visual signs of utilities in the area are noted for investigation. This includes areas outside of the zones marked as scan areas.
- Access to exterior and interior utility areas like mechanical rooms, pumping stations, and power duct banks is requested.
- Design and As-Built drawings are requested for review.
- Checklist of all utilities known to be at the site, informed of by site contact, or observed by visual walkthrough.
- Performed active sweeps with RD. Note: never connect to any electrical wires.
- Performed passive sweeps with RD with both Power and Radio modes.
- Used GPR to perform evaluation scans to determine average depth of penetrations and adjust settings accordingly (gain levels, depth range, dielectric, etc.)
- Performed scans in both directions sufficiently covering work area.
- Marked anomalies within scan area.
- Position marking flags if needed and with client permission every 20’-30’.
- Used traceable rodder for known sewer and storm lines that were not yet located.
- Walked site and reviewed findings and concerns with site contact.