Project pathway
The quickest route to the right decision.

Project owners, design practices and contractors need a specific investigation brief and clarified local prerequisites for groundworks in Luxembourg. FONTANA-EOD in Gersheim reviews existing findings and agrees possible technical services within the permitted scope. Send a site plan, intervention depths and existing reports. Before work starts, clarify the Luxembourg supporting documentation, notifications and coordination with the responsible authorities that are required.
Review historical evidence and earlier reports.
Clarify authority to act and necessary notifications.
Document areas investigated and outstanding questions.
Before excavation, drilling or utility construction, consider historical evidence, existing reports and proposed interventions together. The technical planners establish the findings still needed and a suitable investigation method. Before work starts, check the permitted scope of services and Luxembourg prerequisites, including necessary notifications. SEDAL remains responsible for its public duties concerning found ammunition; German qualification records are considered according to what each establishes.
Documented location references
Select a project location on the map or in the location list. The associated entries lead to the protected reference overview.
The markers show locations associated with documented references, not precise find or site coordinates. Several entries may concern one project. References without a reliable location assignment are available in the complete reference overview.
Luxembourg: ACT / data.public.lu, CC0. Area outline projected for display. Selection and project assignment: FONTANA-EOD.
Ordnance surveying – Howald – Howald multimodal interchange – Howald station and track alterations / Luxembourg · Luxembourg
Service period: 2026-10
Service areas:Surface surveys: GPR, TDEM and magnetometryMethod used in this project: Ground-penetrating radar

Industrial sites, urban infrastructure and projects in the north or east may involve different records and conditions. Preparation depends on the specific intervention and existing findings in each case. Regional orientation supports this work but does not replace an assessment of the property. Agree contacts, local prerequisites and technical findings needed separately for each project.
The Grand Duchy of Luxembourg is a separate state bordering Germany, France and Belgium. Identify the affected municipality and project address. Luxembourg City refers to a specific city; projects in the north, south or east are considered at their actual locations. For cross-border routes, identify the respective sections and contacts separately. The head office in Gersheim coordinates the enquiry; local requirements depend on the site concerned.
The available regional overviews Central Luxembourg, Minette and southern Luxembourg, south-west Luxembourg, Bettembourg logistics corridor lead to the corresponding local information. Select the area of your construction project; the specific municipality and affected properties remain decisive for the enquiry.
For preparation, we need the property's position, existing historical evidence and reports, and a description of the earthworks. We check which questions these records already answer and what still needs investigation. Agree the next steps with the project owner, designers and contractors.
Luxembourg's national portal describes severe destruction in the north and east during the Ardennes offensive from December 1944 and the liberation of Vianden on 22 February 1945. Relate these documented historical events to the actual construction site and available sources. They do not establish general contamination of every property. Keep local land-use and wartime history and technical investigation of today's ground identifiable according to their respective scope during preparation.
Luxembourg requirements apply to work in the country. German permits or certificates of competence do not automatically authorise every activity in the Grand Duchy. Before commissioning, therefore clarify the specialist contractor's permitted tasks, prerequisites for cross-border work and public responsibilities.
Enquiries and project coordination go through our head office in Gersheim. To start, provide the project location, site plan, planned intervention depth, existing records and a realistic timeframe.
For work in the Grand Duchy of Luxembourg, check the prerequisites for the specific activity before carrying it out. Assign company credentials and qualifications to their respective purposes. The parties record which private services are permitted, who handles necessary notifications and which records must be available before work starts. Agree the technical commission and corresponding organisational prerequisites together.
Risk assessment, work areas and communication must suit the proposed activities. Ordnance specialist works are coordinated with the other construction activities. Operational organisation, traffic safety and other specialist technical inspections retain their own responsible parties. Joint coordination brings the information together without equating the different tasks.
A measurement anomaly first requires specialist assessment; its appearance alone does not identify it as explosive ordnance. If an object is genuinely suspected to be ordnance, the prescribed reporting procedures and the measures set by the responsible authorities apply. Investigation reports specify the work completed and its limitations, so that results are not extended to unexamined areas or later design changes.
Local background: Luxembourg Army: SEDAL · Guichet: cross-border services · Guichet: posting of employees.
Planning and documentation: BFR KMR: clearance planning · BFR KMR: geophysics · BFR KMR: documentation. Germany's BFR KMR may provide technical guidance but do not replace Luxembourg requirements or responsibilities.
For work in Luxembourg, check the locally applicable requirements for the specific activity before carrying it out. Guidance on temporary cross-border services and the posting of employees is provided by Guichet.lu: service provision and Guichet.lu: posting of employees. The necessary notifications and evidence relate to the type of service and personnel deployment. German technical guidance does not replace these Luxembourg requirements.
For a section of work in Germany, account for the Explosives Act, First Ordinance to the Explosives Act and risk assessment and occupational safety requirements within their respective scopes. DGUV Information 201-027 and DGUV Rule 113-003, together with the BFR KMR, may support technical understanding of relevant activities. For the Luxembourg section, determine local prerequisites and safety requirements separately and relate them to the specific commission before starting.
The project owner describes the scheme and supplies existing project records. Operators add information on use, access and timing requirements. A coordinating contact brings the information together. The parties agree their respective tasks and decision-making responsibilities. Before commissioning, record what information is missing, who will obtain it and which decision the results are intended to support.
The specialist designers describe areas, depths, construction methods and changes. Site management coordinates the planned sequence with the construction contractors and agreed specialist works. Results are assigned to the respective intervention. A technical plan change is communicated early enough for its effect on the survey task to be assessed before construction. Organisational construction stage boundaries remain distinguishable from technical survey boundaries.
The private ordnance specialist contractor performs the agreed technical task within the permitted scope clarified for Luxembourg. The commission specifies the investigation objective, area, depth and results documentation. Relate required notifications and evidence to the respective activity and personnel deployment. The responsible Luxembourg authorities make the decisions assigned to them. SEDAL performs its public duties concerning found ammunition. The specialist contractor and project parties agree the necessary handovers with the responsible authorities early.
Describe what needs to be established for the next ground intervention. Account for available access, installations and interference when selecting the method. A technical solution used earlier at another location is not a sufficient benchmark. Coordination records which areas can be covered and how unresolved questions will be addressed and communicated to those responsible for the project.
Compare suitable specialist servicesIf ammunition is suspected, stop work in the affected area and leave the object undisturbed. Keep your distance; do not touch or move it. From a safe distance, notify SEDAL or the Police Grand-Ducale on 113. Official reporting addresses the actual find. Routine project enquiries prepare work that can be planned.
Compare investigation methodsLand-use history and today's construction works determine which questions a property needs assessed. The regional examples below provide orientation; they do not establish contamination of an individual area.
For cross-border projects, assign investigation areas, responsibilities and supporting documentation to each country. A report for the German construction section does not automatically answer every question for the Luxembourg section. On both sides of the border, the documented areas and depths must match the actual proposed intervention.
In the south around Esch-sur-Alzette, Differdange and Dudelange, mining and steelmaking have shaped land-use history. During demolition and redevelopment, foundations, utility lines, fill and metal installations can make investigation harder. A former industrial site is not thereby proven to contain explosive ordnance: historical grounds for suspicion are assessed separately from other contamination questions.
Urban excavations, utility works and alterations to transport routes bring together restricted working areas, existing development and ongoing operations. Investigation planning depends on the actual intervention areas, construction stages and access. Records of earlier works must match the new construction task geographically and at depth.
Northern and eastern Luxembourg were particularly affected by the Ardennes offensive, as the national portal also describes. For projects around Wiltz, Diekirch or Ettelbrück, for example, available information on fighting forms part of the historical context. Border locations and former transport or military uses are investigated specifically for the site; a rural location is not an all-clear.
Show working areas with their boundaries, elevations and intervention depths. Include preliminary exploratory works and later excavations as well as access and connections. The technical assessment uses existing site records. Regional historical context alone does not determine the investigation requirements of an individual project.
Before commissioning, clarify which private technical services can be performed under Luxembourg requirements. Provide existing official conditions. Describe the agreed technical task precisely so the client and contractors have the same expectations of the service, results and further coordination needed.
With the responsible parties, check notification and evidence requirements applicable to the specific activity. Requirements for temporary service provision and posted employees are separate questions. Identify who will supply each set of records and how their status will be established traceably before the proposed start.
Agree which accompanying drawings and descriptions are needed for the subsequent groundworks. The report must identify the limits of its conclusions. Pass on private documentation according to its actual purpose. Required official decisions and the handling of found ammunition retain their separate responsibilities.
For each construction site, assess which investigation is suitable and what it can establish under existing conditions. Document measurement and interpretation limitations.
Bring together available aerial photographs, maps, land-use evidence and earlier reports. Source coverage, positional references and evident gaps are decisive. Interpretation produces a reasoned assessment of which areas need further investigation.
Depending on the ground and investigation objective, magnetic methods, TDEM or ground-penetrating radar may be suitable. Metal infrastructure, soil conditions and access affect measurements. Radar provides information about underground reflections; one signal does not establish a reliable ordnance identification.
For piled foundations, deep excavations or shoring, assess which depth range needs investigating. A borehole survey may be considered where suitable surface methods cannot provide the findings needed. A large construction depth alone does not prescribe an identical investigation method in every case.
Where the findings warrant it, define the clearance objective, working area, safety requirements and responsible contractors. Whether FONTANA-EOD undertakes particular works is clarified against the commission and Luxembourg requirements. Agree activities concerning found ammunition separately.
Technical supervision of earthworks may complement the agreed approach. It needs a suitable construction sequence, available contacts and clear procedures for anomalies. Supervision is not a general alternative to investigations required before excavation begins.
Assign identified grounds for suspicion and limits of investigation geographically. Clarify the handling of ammunition actually found with the responsible Luxembourg authorities. Documentation describes results and outstanding questions and provides the technical basis for further project decisions.

A region's wartime history may be relevant to further research. It does not answer what has been established for a particular construction area. Collect existing assessments and reports with their maps. The technical planners check the specific geographical coverage and describe which findings can be used for the proposed interventions and which remain missing.
For an earlier assessment, compare the area considered with today's design. Identify sources and existing results plans by date and publisher. Keep missing appendices visible as specific gaps. For redevelopment, account for known former operating boundaries and later ground changes; relate additional information requirements to the next groundworks.
Arrange specialist assessment of historical evidence
A suitable investigation depends on the construction task and site conditions. Clarify Luxembourg prerequisites before commissioning as well. Identify existing official conditions and contacts. The agreed service should show which technical task is to be performed, what results are expected and which further decisions remain with the responsible authorities.
Distinguish the technical findings needed from organisational prerequisites still unresolved. The construction area description should include working spaces, preparatory interventions and undecided alternatives. For tendering, specify expected results documentation and known access restrictions. Once the scope is defined, agree the private technical services and coordination required for it.
Compare specialist services
Document a result with its area, depth, method and limitations. Site management needs these details together with the accompanying drawings. Private technical documentation thereby serves a specific technical purpose. Do not present it as general official clearance or transfer it to other properties, greater depths or construction phases not yet investigated.
For the project file, retain the drawing revision used with all relevant results appendices. Keep an area not yet investigated identifiable as an outstanding task. Hand over this information in full if the contractor changes. Plan additional investigation around the ground newly affected; suitable existing findings remain part of the evidence.
Document findings and their limitationsCross-border work may involve different evidence and notification requirements. Clarify which prerequisites apply to the specific service and who handles each set of records. Consider information on temporary service provision and the posting of employees together. Evidence from one of these areas does not automatically answer every question in the other.
Technical preparation also needs early exploratory works, trial openings and additional working areas. A drawing of the finished building does not always show these interventions. Include positions, depths and sequence. Available findings can then be compared with the actual forthcoming works before a method or investigation date is set.
If area clearance is needed, describe its objective, geographical scope and handovers within the technically agreed approach. Account for permitted private activities and SEDAL's responsibilities. Clearance work actually carried out is documented in a clearance record identifying the areas covered and limitations. Keep the report and accompanying drawings together in the project file.
Historical aerial photograph analysis relates available images, maps, land-use records and earlier reports to a particular investigation area. Identify historical dates, geographical coverage and gaps traceably. If historical questions remain unresolved, carry out the necessary research and aerial photograph analysis. For a cross-border project, identify each country's sections clearly. Historical interpretation remains distinguishable from technical investigation of today's ground. Its results inform specialist investigation planning alongside the planned intervention and other findings.
Understand aerial photograph assessmentGeomagnetic surveying passively measures the magnetic field and investigates magnetic anomalies. Conductivity alone does not make an object detectable geomagnetically. During redevelopment and urban works, reinforcement, utility lines, fences and other installations may affect measurements. The technical planners justify suitability for the volume of ground proposed and findings needed. Interpret measurement data and interference together. A strong signal alone is not an ordnance identification. The documentation records the areas actually investigated and achievable limits.
Understand the scope of magnetometryTransient electromagnetic methods, or TDEM, investigate the electromagnetic response of conductive objects over time. Selection accounts for expected target objects, the volume of ground needed and actual measurement conditions. An infrastructure project may combine open areas with densely occupied connections. Account for these differences in investigation and interpretation. Keep positional references, interference and restrictions documented. Determine supplementary measurements from the outstanding technical question. Clarify the equipment's technical suitability and local requirements for its specific use together for the commission.
Understand electromagnetic surveyingUnder suitable conditions, ground-penetrating radar can record underground structures and reflections. Soil structure, moisture, installations and the investigation objective determine its appropriate use. Specialist interpretation relates the measurements to other findings. An anomaly does not automatically identify explosive ordnance; a display without anomalies remains limited to the area investigated. When using existing data, account for the original commission and limitations. Check the usefulness of utility detection or geotechnical measurements for the ordnance question accordingly. Results documentation records the findings needed for the next groundworks traceably.
GPR and limitationsFor piled foundations, drilling, shoring or deeper excavations, describe the volume of ground needed by position, depth and elevation datum. If a suitable surface investigation cannot provide the findings required, a coordinated deep or borehole survey may be considered. Preparation includes existing utility lines and technically appropriate creation of investigation access. Identify technical results or borehole clearance with their actual investigation scope. Before using them, check additional depths or relocated starting points against them. Clarify necessary Luxembourg prerequisites before carrying out each activity.
Prepare deep interventionsAn ordnance investigation alongside construction is technically planned where a necessary preliminary investigation cannot be completed in full and this approach suits the task. It may combine excavation in layers, specialist exposure and supplementary surveys in the relevant working area. Visual observation of excavation alone is insufficient for detection. Schedule interpretation and communication of findings within the construction sequence. Keep investigated areas, limitations and outstanding tasks documented. If ammunition is actually found, stop work and notify SEDAL or the police; private technical work remains within its previously clarified permitted scope.
Agree the approach during constructionIdentify the intervention for which the investigation is needed. For a utility line, this may include individual sections, deeper shafts and additional connection pits; for a building, also include preliminary exploratory works. Relate existing historical assessments and technical results to them. The commission should identify the question the technical service is to answer. This makes it possible to trace later whether a result actually applies to the next groundworks. A general request to assess the property often lacks this essential definition.
Identify known installations, paved areas and operational restrictions. State which areas are accessible when and whether preliminary works are proposed. The technical planners assess suitable methods against these details and the findings needed. If local conditions become apparent only during the works, assess their significance for the agreed scope. Record the resulting limitations in the report. A general area figure or unchanged schedule does not expand a technically limited conclusion.
Assign the report to the area actually investigated and drawing revision used. Site management needs complete maps and limitations as well as the summary. If further evidence or coordination is required, clarify its purpose with the responsible authority. A private report describes the technical service performed; its title alone does not replace a required official decision. For changed or later interventions, check again whether documented results match the position, depth and question.
Send the current ground intervention design, existing ordnance reports and known local requirements. Identify missing appendices or unclear geographical references. Label geotechnical and soil contamination records separately. For coordination, it helps to identify each report's author and the question it answers. This shows specifically which evidence is available for the proposed service. At first contact, identify the project location and findings needed. Check existing drawings, statements and reports for currency, geographical relevance, completeness and gaps.
Where historical questions remain open, necessary research and aerial photograph assessments are actually carried out within the commission agreed by specialists. Existing assessments are considered with their respective subareas and conclusions. Additional findings are assigned to the present area of ground disturbance and used in investigation planning.
Describe the technical task and proposed personnel deployment. Before work starts, check the applicable Luxembourg requirements and necessary credentials and notifications. A general company qualification does not answer every question for a specific commission. Record which parties supply the outstanding records and how the agreed version will be available before starting. Select the method according to the investigation objective, intervention depth, soil structure, installations and actual measurement conditions. Clarify access and necessary prerequisites with the responsible parties.
Clarify access, contacts and the groundworks sequence. Pass on design changes before the affected activities. The responsible authorities and reporting procedures for findings must be known. Handle an actual ammunition find according to official instructions. Keep routine technical collaboration and urgent reporting of a find clearly distinguishable in the sequence.
The agreed survey or appropriate investigation during construction is carried out on the defined areas and points. Measurement data and observations receive clear position and elevation references. Uninvestigated areas, restricted access and relevant interference are recorded.
The collected data and findings are assessed against the investigation objective and actual measurement conditions. The assessment takes account of interference and limitations. The report and plan appendices document the technical assessment, areas addressed and their position, elevation and depth references. Required further tasks follow from this.
Site management receives complete results with geographical coverage, depths and limitations. Check which proposed works they cover. Identify outstanding areas with the clarification still needed. Keep the same complete documentation available if responsibilities later change. Compare new or changed interventions against this record before using findings from an earlier construction phase.
Provide the intervention design, earlier reports and existing project requirements. Identify responsible contacts and the proposed start. Initial coordination establishes the technical requirements and identifies unresolved prerequisites. This links a preliminary technical assessment traceably with binding preparation for work that can actually be undertaken lawfully.
Determine which records, notifications and access arrangements the agreed task needs. Inform the specialists involved about design changes. Base the investigation on the current status. After the works, site management receives the complete results with their limitations; keep further coordination required identifiable with its responsible party.
Before mobilisation, establish which works the specialist contractor may undertake and when the responsible public authorities must be involved.
The Service de déminage de l’Armée luxembourgeoise, or SEDAL, is the Luxembourg Army's ordnance service. Its published duties include responding to unexploded ammunition from the world wars. Coordinate private investigation and planning services with this public responsibility. Defusing and destruction are among SEDAL's duties.
Before mobilisation, clarify the credentials, notifications and safety requirements needed for the proposed activity. Guichet.lu describes, among other matters, notification of temporary cross-border services for certain activities and employee posting notifications to the Inspection du travail et des mines. Requirements applicable to a commission depend on the service and personnel deployment; a general company credential does not replace this check.
For the works, agree investigated areas, intervention depths, working sections, contacts and reporting procedures. Clients, designers and site management should be able to identify which findings they can rely on and which questions need clarification. Check changes to excavations, routes or foundations against the existing investigation scope.
The completion report identifies the areas and depths covered, methods used, results and limitations. Clearance documentation also applies only to its described scope. It does not replace a required official decision or establish the absence of explosive ordnance for any later use.
Clarify proposed works and permitted activities.
Involve SEDAL and other authorities according to the commission.
Collect the necessary records before mobilisation.
Account for position, depth, access and construction stage.
Define reporting procedures for findings and changes.
Record investigated areas, depths and limitations.
The investigation report describes the agreed scope and work actually performed. Document areas, depths, methods and remaining limitations traceably. The next groundworks must match these findings. Clarify the form and further evidence needed locally against Luxembourg requirements and the specific project task.
The Service de déminage de l’Armée luxembourgeoise, or SEDAL, performs public duties concerning unexploded wartime ammunition. Within the service's remit, these include identification, specialist assessment, defusing and destruction. A private technical service has its specifically clarified commission, necessary supporting documentation and agreed handovers. Report a find to the public authorities through the designated procedure.
We assess the planned groundworks against the available documents and their design revision. Before attending site, we agree with you what needs to be investigated, which areas are accessible and what findings are required. If the design or site conditions change, we check whether the agreed scope remains appropriate. The report states what was actually investigated and the limits of the findings. This allows designers and site management to see which findings they can use and where questions remain.
Discuss the investigation taskWe first establish the investigation objective: which question must it answer? We then select a technically suitable method. The availability of a particular device or experience on a similar neighbouring site is not enough to justify the choice of method on its own.
Inaccessible areas and limited conclusions are identified. They do not disappear into a total area figure. Designers and site management can then decide specifically which areas still need attention and when a suitable survey becomes possible.
A new location, additional depth or different construction method is compared with previous results. A familiar project name does not replace this comparison. Feedback is provided before the affected work so that an outstanding question can be included in the sequence.
The technical conclusion remains connected to its location references and appendices. A brief summary helps orientation but does not replace the documented survey scope. This basis is retained even if site management or contractors change.
The linked authorities explain their responsibilities, what to do when items are found and prerequisites for cross-border work. Check the requirements for a specific deployment before it takes place.
Check what a document is intended to establish. A qualification, service notification and technical investigation report answer different questions. Bring the records together with their respective requirements. Clients and site management can then trace which prerequisite has already been clarified and which decision is still needed before the proposed activity.
Understand investigation reports and their limitationsThe BFR KMR describe technical relationships in planning, investigation and documentation. For a project in Luxembourg, they may support technical understanding. They do not replace local requirements or responsible authorities. During preparation, therefore record which technical principles are used and which local prerequisites apply to the specific service.
Understand the service scope
Aerial photograph interpretation is related to the actual groundworks. Its purpose and geographical scope remain distinct from a technical investigation of the ground as it is today.
Understand aerial photograph assessment
The findings, their locations and limitations are handed over together. This makes clear to those carrying out the work which area has been investigated and which task remains outstanding.
Assess investigation reports


Distinguish historical assessment, technical investigation and subsequent work according to the outstanding task. Identify missing findings, the volume of ground to be investigated and results documentation needed. Agree an appropriate technical service within the permitted scope clarified for Luxembourg.
Compare services
Preparation connects the commission, site work and handover of findings. Changes to the project can then be incorporated into technical coordination in good time.
Process and documentationWhether a survey is necessary must be assessed for each project. Specific indications, existing records, planned groundworks and applicable requirements are decisive. Select the measurement method only after that assessment.
SEDAL is responsible for operations concerning unexploded wartime ammunition in Luxembourg. Stop work in the affected area. Do not touch, move, relocate or further expose the suspicious object. Keep your distance, leave the danger area and keep others away. From a safe distance, notify SEDAL or the Police Grand-Ducale on 113. Do not transport the object to a police station, other official premises or collection point. Follow the responsible authorities' instructions.
No. German credentials may demonstrate qualifications. Before commissioning, check which activities may be performed in Luxembourg and which credentials or notifications they require against local requirements.
A site plan, proposed groundworks with depths, existing reports and known local requirements. Include contacts and the proposed start.
No. Assess the administrative prerequisite and technical task separately, then bring them together for the works.
The work involved depends on existing findings, area, intervention depths, suitable methods, access and interference. Necessary preparatory work, interpretation, documentation and handovers form part of the private service scope. For cross-border work, account for the specific supporting documentation and organisational prerequisites needed. Distinguish the authorities' handling of finds from commissioned project services by their respective purposes and responsibility for costs.
Its technical conclusions can be considered if area, depth and task match. Clarify required Luxembourg supporting documentation and responsibilities separately.
Only insofar as the documented geographical and technical scope actually covers the planned intervention there. Proximity alone is insufficient.
Bring together interventions, earlier results and findings needed.
Include elevation datums, existing utility plans, access and the timeframe. Identify early exploratory works, borehole positions or ancillary pits with their positions and depths as well. Mark sections and unresolved alternatives. Preparation should make it clear which findings are needed first and who brings together current project information between design and construction.
Identify contacts, known requirements and necessary supporting documentation.
Organise existing records by purpose: technical investigation, company qualifications, service notification or employee posting. Identify which authority clarifies each prerequisite and who provides the current information. Request missing details specifically. Before the works, check changed activities or personnel deployment against the prerequisites already clarified.
Describe your construction project and send a site plan with existing investigation reports. We discuss which information is missing, which technical services may be suitable and which coordination is needed before mobilisation.
Your enquiry is coordinated through FONTANA-EOD's head office in Gersheim. Also provide local design contacts and conditions such as railway operations, existing utility lines or several construction phases.
+49 6843 9994997 · info@fontana-eod.de
If ammunition is currently suspected: leave the object undisturbed, leave the danger area, keep others away and notify SEDAL or the Police Grand-Ducale on 113 from a safe distance. A routine project enquiry prepares planned works.
Whether historical aerial photograph analysis, explosive ordnance surveying, surface surveying using GPR, magnetometry or TDEM, deep-ground surveys, downhole surveys, excavation supervision, area clearance or ordnance recovery is needed depends on the location, ground disturbance, depth, ground and existing documents. An early ordnance assessment provides clarity for tendering, programming, occupational safety and construction.
FONTANA-EOD combines its Section 7 SprengG licence, specialists holding Section 20 SprengG certificates of competence, suitable survey and clearance methods, and traceable documentation. Send the site plan, depth of ground disturbance, construction phase and existing documents for an initial technical assessment.