Overview

The Challenge
The overall objective of the Mina Al Fahl PDO Phase-5A Master plan Development Project is to update the existing master plan (42 Ha) drawing with detailed survey & Construct new facilities as per proposed Master plan.
Designing and building a complex urban brownfield project is fraught with challenges, one of which is the location of existing underground infrastructure and its impact on the future development. Utility diversions can be costly and complex.
Existing topographic survey data & buried services details provided by client is not up to date and may cause catastrophe to the new construction activities due to insufficient information about the existing underground utilities. Existing as-built/in-place drawings indicate the locations of buried services and foundations; however, these may not always be fully accurate or complete.
The Solution
G Map LLC proposed an Topographic survey & underground utility locating field-survey (GPR) to identify all existing buried services and objects, which might affect or be affected by the construction works. This information is required for the design phase to prevent miss calculations, to avoid clash with proposed facilities and to optimize the excavation & levelling works and avoid crash of underground development. Subsequently during the construction phase to prevent unscheduled clashes with existing services;
Benefits
Non-destructive GPR technology makes no damage on the subsurface, environment or surrounding people. Latest GPR technology makes use of 2 different frequencies to detect shallow and deep utility services simultaneously. Dual-frequency antenna to detect deep and shallow targets simultaneously. The 700 MHz antenna permits the user to see small shallow targets, depending on the soil conditions (up to 2m). The 250 MHz antenna permits the user to see bigger targets situated deeper underground (up to 5m). Similar to having a test trench or boring along the whole length of the project without digging. The proposed technology could detect & trace metallic, Non-metallic, pipes, fiber optics, active and non-active utility objects in combination with CAT detector with Genny. 
Utility Detection Radar finds all potential threats, including non-conductive pipes and fibre optics, increasing safety by lowering the risk of accidently hitting underground assets. Increase safety, speed up work and lower asset management costs with the ability to prevent hazardous outages and collect more information.
The Solution
The client were able to not only understand the trace of their underground services, but also improved the accuracy of their data with GPS integrated GPR survey results. The old existing as-built utility maps were updated with the newly surveyed information and the same has been verified at site. The proposed technology could replace the requirements of multiple trial pits and excavations at highly risky Oil & Gas project environment. This technology reduced a huge amount of time, resources & money. 
G Map also marked the excavation areas at site as per the masterplan by avoiding the utility areas based on the GPR survey results. Detailing methods used, data quality review, highlighting areas of interest, evaluation of traced utilities against statutory plan information and further recommendations based on the client’s objectives.
The entire process completed in 4 stages as below;
•    Survey type D: Desktop utility records study and analysis
•    Survey type C: Site reconnaissance
•    Survey type B: Detection of utilities by multiple geophysical methods
•    Survey type A: Verification of utility positions by strategic excavations
The new GPR technology reduces manual excavation, verification, eliminates time-consuming analysis, and provides a higher level of quality assurance. The case study explains the process to assess and verify underground infrastructure has had a positive outcome on all levels of the design and build and allowed tight deadlines to be achieved.