How were underground utilities located and verified?

Kiwa T2 reviewed available records and used geophysical methods such as electromagnetic pipe and cable locators, CCTV, and ground penetrating radar, along with surveyed marks and test holes at key conflict locations, to determine and confirm utility alignments.

Metrolinx - Eglinton Crosstown LRT

Modern red and white light rail train travelling on a street beside green trees under a blue sky.

8 September 2026

Utility investigation confirmed and refined underground utility locations for the LRT expansion, identifying key conflicts and undocumented utility revisions.

Client: Metrolinx

The purpose of the utility investigation was to clearly identify the location of existing underground utilities in order to facilitate the design for the expansion of the LRT system. The investigation focused on telecommunications, gas, electrical, steam, water, pipes and sewers.

Kiwa T2 collected and analysed all available utility records and information from Transit City/AECOM and utility companies. Kiwa T2 used geophysical technology such as electromagnetic pipe and cable locators, CCTV, and ground penetrating radar (GPR) to determine the horizontal and vertical alignments of utilities. All marks/pins were surveyed and information extrapolated into a composite utility design showing the existing utilities at the appropriate Quality Levels in accordance with the ASCE 38-02; Standard Guideline for the Collection and Depiction of Existing Subsurface Utility Data. Test holes were also completed at key conflict locations to help determine utility impacts with the project design.

The investigation was successful in confirming and further refining the location of the existing utilities. Notable findings included the following: undocumented revisions on storm/sanitary sewers, abandoned water mains and gas mains.