Protecting College Campus’ Wastewater Infrastructure During Excavation

• Existing as-built documentation indicated that a sewer line ran through the planned location for the new building’s foundation, but the contractor had not been able to locate the line themselves
• The sondes (instrument probes) built into GPRS’ sewer inspection rovers can only locate sewer lines up to 15 feet deep
• Due to the hilly conditions on campus, the sewer line was presumed to be located deeper than normal

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• GPRS Project Manager deployed a Prototek Durasonde ‘super sonde’ Transmitter, which is locatable in nonmetallic pipes over 50 feet in depth
• Sewer pipe was located, and location and depth were marked on the surface using spray paint, so project team knew where they could and could not dig
• Data was uploaded into SiteMap® to document sewer line’s location for future O&M purposes

• GPRS helped prevent subsurface damage that could have otherwise derailed the project and led to service interruptions
• Documentation of the line’s location and depth in SiteMap® will streamline future O&M