Scope of Work:
GPR survey execution for mapping underground utilities to plan the exactalignment of metro track for Mumbai Metro Line 4
Thane, Mumbai, India.
Tata Projects Pvt. Ltd.
GSSI SIR-3000 equipped with 200 MHz and 400 MHz antenna
Hevey rain, high moisture content, heavy traffic condition
The GPR survey has been carried out at Proposed alignment of metro line 4 in Mumbai,
Maharashtra. The total area scanned was approximately 36000m2 on a road. The scope of
work includes the mapping of possible underground utilities up to the depth of around 6-7 m
using non-destructive Ground Penetrating Radar technology. The purpose of the project was
to map all the underground utilities and to prevent the damage to the same during the con-
struction work. Considering the client's requirements and the expected depth of the utilities,
the area has been surveyed using two antennas of center frequencies 200 MHz and 400 MHz
mounted on SIR 3000 GPR system to cover the depth up to 6-7 m with fair resolution. The purpose of the survey was to map all the underground
utilities viz. cables, water lines, gas lines, sewer line etc. up to the depth of 8 m using
non-destructive technology. The whole data is collected depending on the site condition and
maximum accessibility of the road. Numerous parallel profiles have been collected across the
width of the road at a spacing of 5 m. Overall 31 along the road utilities and four across the road utilities are found to exist
at different depth range. Additional information like presence of culvert and potential location due to void or
leakage is also marked in the drawing.