GPR Services
Construction Site GPR Survey and Pre-Excavation Clearance
The cheapest day to find a buried foundation is the day before you excavate. The most expensive is the day the piling rig meets it.
What a cleared site still contains
A demolished building leaves footings.A cleared plot leaves a septic tank.A levelled field leaves a well.The surface tells you none of it.Site clearance removes what is above ground. Everything below stays exactly where it was, and on a plot with any history that is usually more than the developer has been told about.
Buried structures · Chambers and tanks · Abandoned borewells · Live services
Quick AnswerMezux Touch carries out pre-construction GPR survey for site clearance — detecting buried foundations, chambers, septic tanks, abandoned borewells and live services before excavation begins, so a piling programme is set out against measured ground rather than a demolition assumption.
Timing is the whole value of this survey
Found before excavation, a buried footing is a setting-out adjustment. Found by a piling rig, it is a stopped programme, a damaged tool and a redesign under time pressure.
That is why we push clients to survey after demolition and before setting out rather than at either end. A survey commissioned once piling has started is investigating a problem instead of preventing one.
What we find that clients did not expect
Old footings and basement slabs from demolished structures are the most common. After that: septic tanks and soak pits, disused chambers, abandoned borewells, and on former agricultural land, brick-lined wells and irrigation channels beneath levelling fill.
A vertical void beneath a proposed footing is a different order of problem from a service line, so we report structural findings in their own schedule rather than mixing them into a utility drawing.
How a site survey runs
What was on this plot before?
Demolition drawings, old imagery and local knowledge tell us what to look for. A plot that held a factory and one that held houses leave entirely different things behind.
Area coverage rather than a corridor
Site work is surveyed as an area on a grid rather than as a route, with spacing set against the smallest feature that would affect the foundation design.
Footings, slabs and basements
Buried structural remains are mapped with their outline rather than as a point, because the design question is how much of the footprint is affected.
Tanks, soak pits and borewells
Vertical voids and buried chambers are reported in their own schedule, since a cavity beneath a proposed footing is a structural matter rather than a utility clash.
Live connections still in the ground
Incoming services frequently remain live after demolition. These are identified and reported as live or unverified rather than assumed disconnected.
Stating what the ground allowed
Achievable depth is stated for the site rather than assumed, because made ground and demolition rubble both limit how far radar usefully reaches.
Findings against your setting-out
Results are issued overlaid on the proposed foundation layout where the client provides it, so clashes are visible rather than requiring interpretation.
What is worth verifying before piling
Where a finding sits under a critical foundation element, we nominate it for trial excavation rather than leaving the design team to decide on a radar image alone.
Greenfield sites are not empty either
Land that was agricultural within living memory carries field drains, irrigation channels, open wells and abandoned borewells beneath the levelling fill. None of it appears on a developer's layout.
A brick-lined well beneath a proposed footing is a structural problem discovered late, and it is entirely findable early.
NCR development areas we clear
Underground chamber detection is part of every site clearance here, since disused inspection chambers and soak pits survive demolition almost without exception. A GPR survey for construction is commissioned for one reason above all others: underground structure detection before setting out, so a piling programme is not designed against an assumption about what demolition left behind. Plots across the capital region are surveyed before setting out. What a site is likely to contain depends heavily on which area it sits in:
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Frequently asked questions
After demolition and before setting out. Earlier misses what demolition exposes; later is investigating a problem rather than preventing one.
Old footings and basement slabs, then septic tanks, soak pits, disused chambers and abandoned borewells.
Frequently. Demolition rarely includes disconnection at the main, so we report services as live or unverified rather than assumed dead.
Yes, it limits achievable depth. We state the figure for the site rather than quoting a general one.
Yes, where you provide it. Clashes are then visible rather than requiring someone to interpret two drawings together.
About to set out a piling programme?
Survey after demolition and before setting out — that week is when this costs least and prevents most.
Get A Quote +91 99100 10209Construction site survey — timing, findings and detailed questions
Site clearance surveys are commissioned at three points and only one of them is right. Before demolition misses what demolition exposes. After piling begins is investigation rather than prevention. Between the two, when the plot is clear and setting out has not started, is when the same survey costs least and changes most.
Why structural findings are reported separately
A buried footing, a septic tank and an abandoned borewell are structural matters for the foundation designer. A live cable is a safety matter for the excavation contractor. Presenting both on one drawing means whichever reader is looking has to filter out half of it, and on a busy site the filtering does not happen. We issue two schedules for that reason, and the structural one usually reaches the design team while the services one reaches the site.
What is delivered
A site plan showing detected features with outlines rather than points, so the affected footprint is visible. A structural findings schedule covering buried footings, slabs, chambers, tanks and vertical voids. A services schedule with confidence per feature and live or unverified status stated. Achievable depth for that specific site given the made ground present. Where the foundation layout is supplied, an overlay showing clashes directly. Recommendations for trial excavation where a finding sits beneath a critical element.
Beyond the basics
Can you find a septic tank reliably? Usually, since a buried chamber returns strongly. Depth and surrounding material affect it, and we state confidence per feature.
What about deep basements from old structures? Detectable to the depth the ground allows. Where a basement is deeper than radar reaches, we say so rather than implying full clearance.
Is a greenfield site worth surveying? Yes, if it was agricultural. Field drains, wells and borewells beneath levelling fill are common and none appear on a layout.
Who uses the structural schedule? The foundation designer, usually before setting out. The services schedule goes to the excavation contractor, which is why they are separate.
Do you attend during piling? On request, for spot clearance ahead of the rig. It is more expensive than surveying the whole site beforehand and occasionally worth it.
Terms used on this page
Setting out — marking the foundation layout on site, the point after which changes cost more. Vertical void — an abandoned borewell, well or shaft, a structural hazard rather than a utility. Made ground — material placed by people, including demolition rubble, which limits survey depth. Overlay — survey findings plotted against a proposed layout so clashes are directly visible. Trial excavation — exposing a detected feature to confirm it before a design decision depends on it.
