Technical map view of the Darmstadt administrative district with Darmstadt marked for explosive ordnance assessment and surveying by FONTANA-EOD

Explosive ordnance surveying in Darmstadt

An explosive ordnance assessment for your Darmstadt project requires the groundworks plan, existing findings and details of the proposed work. FONTANA-EOD clarifies the investigation scope and site requirements with you. We also agree which documents are still needed before work can begin.

Commissioned scope

State the groundworks, areas and depths.

Records

Provide the official statement, appendices and current plans.

Execution

Agree responsible persons, access and required notifications.

Assess the construction project

Coordinate preparation with the work actually commissioned

For an explosive ordnance assessment in Darmstadt, the area enquiry, technical commission and details of the proposed work are coordinated. We review the available records and identify requirements still to be met. Changes to participants or work areas are accounted for transparently before the activities concerned.

Project references

Selected project examples

Project site

Connect the site with the specific construction task

Schematic map with a coat of arms, alongside a tablet, safety helmet, notebook and pen.

Read the Darmstadt cycle path notice as a specific sequence of events

The notice dated 24 March 2026 describes a last-minute change of specialist contractor and difficulties submitting the clearance site notification in time for that project. For your project, participants, work areas and required documents are agreed early. The relevant timing requirements follow from your own commission and the current requirements of the responsible authorities. Darmstadt is an independent city in Hesse. Identify the actual construction area, for example in Innenstadt and Mathildenhöhe, Bessungen, Arheilgen, Kranichstein, Eberstadt, Wixhausen or Martinsviertel. For projects in Griesheim, Weiterstadt, Pfungstadt, Dieburg and Groß-Gerau, the actual project location and its responsible authorities must be established. The project owner and designers show the areas and depths actually affected; an adjacent address or neighbouring investigation report is used within its own scope of conclusions.

The Darmstadt administrative district overview provides further local information to place your project in its regional context.

Local context

Darmstadt’s wartime history and project preparation today

Relate historical records to the current construction area

On the night of 11–12 September 1944, Darmstadt suffered extensive destruction. The city’s history also documents the subsequent clearance of rubble and the establishment of businesses on the former parade ground and surrounding barracks sites. During historical investigation, these recorded wartime effects, uses and ground alterations are brought together spatially with the available files, wartime aerial photographs and current groundworks plan. The city’s history establishes the historical context, rather than providing a conclusion for an individual borehole location. For the actual construction area, existing evaluations and technical reports are checked for their spatial reference, date or revision and outstanding questions. Documented filling, redistribution of soil and later construction are included in this review with their dates and spatial extent.

Consider the documented cycle path project in its own context

On 24 March 2026, Darmstadt reported a delay to the extension of the cycle path towards Roßdorf. The notice linked it to a last-minute change of the specialist contractor commissioned and a clearance site notification that could not be submitted in time. This case does not establish a general notice period for other projects.

Prepare the enquiry and notification with your own documents

The explosive ordnance clearance service at Darmstadt Regional Council, responsible throughout Hesse, distinguishes an aerial photograph evaluation request from notification of explosive ordnance clearance work. For notification, it lists, among other requirements, the permit holder’s signature, a site plan, and evidence of the permit and responsible supervisor’s competence. Compile the required information and evidence before the planned start of work.

Working together

Distinguish the tasks of client, designers and specialist contractor

Client and operator

The project owner describes the project and provides existing project documents. The operator adds requirements for use, access and timing. A coordinating contact agrees the tasks assigned to them with those responsible. Before commissioning, the missing information, who obtains it and the decision the result is intended to prepare are recorded clearly.

Planning and construction management

Technical planning describes areas, depths, construction methods and changes. Site management coordinates the proposed workflow with the contractors and agreed technical work. Results are assigned to the relevant groundworks. A technical design change is passed on early enough for its effect on the investigation task to be assessed before execution. Boundaries between construction stages remain distinguishable from technical investigation limits. Site management accounts for access, existing utilities, necessary protective measures and agreed hold points. Changes or unexpected findings are passed to the designated contacts. In its documentation, the specialist contractor records the spatial and technical scope actually covered, including inaccessible areas and interference.

Specialist company and competent bodies

The private explosive ordnance contractor carries out the agreed investigation and documentation work. Official requirements and decisions are clarified with the responsible authorities. The documents required for a particular procedure depend on the location and project. The technical report describes the specialist work performed; its conclusions are not presented without review as general authorisation for further groundworks or as an official decision. The explosive ordnance clearance service at Darmstadt Regional Council, responsible for all of Hesse, arranges removal and, where necessary, defusing and destruction of explosive ordnance. This state responsibility is considered when planning schedules and notifications. Required notifications and handover of results are coordinated with the relevant parties according to the specific activity and Hesse’s requirements.

Investigation task

Which specialist task comes next?

Determine the technical task from the plans

The method depends on the information required, the proposed groundworks and actual site conditions. Organisational details of the commission supplement this preparation, but do not replace technical method selection. For the area concerned, suitability, access and investigation limitations are assessed together in a traceable way.

Compare specialist services for the planned groundworks

Update the technical assessment when the groundworks change

An additional area or greater depth is compared with the existing findings. This establishes whether the agreed task needs to change. The parties affected are also informed. A notification already prepared or an earlier commission does not automatically describe the expanded scope of the new groundworks.

Compare investigation methods
Project types

Bring records, participants and execution together

Illustration: two people review plans and documents at a table beside a construction vehicle.

Link the enquiry to the correct area

An initial assessment needs an unambiguous spatial reference and a description of the proposed groundworks. Existing correspondence is attached with its date and appendices. The enquiry provides a basis for further planning, but does not document that a technical investigation has been commissioned or carried out.

Coordinate the sequence and tasks
Illustration: two people review plans and documents at a table beside a construction vehicle.

Record responsibilities and the full commission

To prepare the work, the responsible parties and current technical task are brought together. A change of contractor is reflected in the relevant records. Earlier information remains as project history. The work actually agreed and its applicable requirements govern the next activity.

Document findings and their limitations
Illustration: two people review plans and documents at a table beside a construction vehicle.

Base the start of work on clarified requirements

Coordinate the planned start with available access, required records and responsible parties. Identify outstanding information specifically. A date in the construction programme does not by itself constitute technical confirmation. Execution is prepared according to actual progress and the commission’s requirements.

Coordinate the sequence and tasks
Preparation

Prepare the scope and commission together

Establish what needs to be known before commissioning the work

First establish which decision the commission needs to support. Is the task an initial assessment of existing documents, an investigation of a specific area or examination of an anomaly that has already been assessed? These tasks require different evidence. A general wish for safety does not define an investigation that can be carried out. The enquiry therefore specifies the groundworks, location, depth and available findings. Suitable specialist work and the required reporting are then agreed on that basis.

Define the specialist task

Coordinate preparatory work with the investigation

Required access and survey conditions are clarified before the site visit. This may include keeping areas clear, obtaining service information and coordinating with other trades. The method and site determine which preparations are actually needed. Changes to the surface or additional groundworks are not undertaken unilaterally simply to prepare for a survey. Their sequence is agreed with the specialist designers and responsible parties.

Clarify preparatory work in the programme

Agree a clear scope and schedule

A sound workflow distinguishes work already clarified technically from outstanding prerequisites. If an area will be accessible only in part, commissioning must take this into account. Handover and assessment of results also need time in the construction sequence. An enquiry therefore does not imply a blanket commitment on dates or cost. Specific coordination connects the described scope with access, documents, execution conditions and the date by which a decision is needed.

Discuss the scope and schedule
Tasks at the site

Prepare the commission and identify contacts

01

Planned groundworks, areas and depths

Describe the work ahead and the areas or depths affected. Labels such as construction project or refurbishment alone do not establish investigation needs. Possible preparatory drilling, new utilities or additional foundations are recorded with their own spatial reference. Show excavations, shoring, foundations and underground car parks with the volumes affected horizontally and vertically. Utility construction and crossings are assigned to the relevant road and network sections on the groundworks plan. The specialist contractor can then check which question an existing investigation already answers and which groundworks require supplementary work.

02

Provide official statements with all appendices

Provide the official records with their appendices and file reference, if available. Check which plan revision and area they concern. Pass on the complete documents so that conditions and spatial limits remain clear. When commercial, production, storage or research sites are repurposed, retained construction and use plans, records of previous groundworks and complete technical reports are also helpful. The parties compare the spatial information in these documents with the current project. Different plan revisions or missing appendices are recorded as specific questions before an additional investigation is commissioned.

03

Client, designers and access to the site

Preparation must establish who commissions the work, who communicates design changes and who organises site access. The responsible technical supervisor and official contacts retain their respective duties. An organisational contact list does not replace required permits or certificates of competence. For road, railway and bridge work, operational conditions, access and accessible investigation areas are agreed with the relevant operators. This also applies to stations, tracks, freight facilities and underpasses. Contacts for utilities and existing structures remain identifiable. Those responsible assign necessary preparatory work and handover dates to the individual sections. Changes in requirements are communicated to the specialist contractor before its deployment.

04

Communicate changes to the commission or execution

If the contractor, work scope or proposed sequence changes, the relevant information and records must be checked again. The notifications required in the specific case are clarified with the responsible parties. Before work begins, check whether the technical and organisational requirements have been met. A planned date does not confirm this. After a change of contractor, the work specification, named supervisor, planned work areas and current progress are brought together. Existing results are retained with their appendices. Based on the new commission, the parties clarify which information or notifications need updating and which technical requirements remain unresolved before the activity concerned.

Project documents

Documents that establish the next step

File preparation records and results separately

Enquiries, notifications and commissioning records explain how the work was prepared. After execution, the report documents the area actually covered and the results. Both types of record remain identifiable. Site management can then trace which steps had been prepared and which technical conclusions are actually available for further groundworks. The results file brings together the site plan, areas and depths covered, method used, surveying conditions and technical assessment. Restrictions caused by installations, interference or lack of access are assigned to the relevant section. Where clearance work has actually been commissioned, its records form part of this evidence. Designers and site management can then compare the forthcoming groundworks with the documented investigation volume.

Pass on the complete file when the contractor changes

Provide the newly involved specialist contractor with current plans, previous findings and outstanding questions. Responsibilities for any necessary updates are agreed. An earlier scheduling agreement does not replace this comparison. The handover also preserves restrictions and appendices that may matter for the new work. Current plan revisions, existing survey and results records, and outstanding tasks are compiled for the handover. The investigation purpose, actual scope completed and decisions still required remain clear. Parties joining the project later also need these complete appendices. New investigation needs are agreed against the changed task and the existing results that remain usable.

Construction sequence

Coordinate investigation and construction sections

Establish a shared current record before execution

Use a current groundworks plan and bring together the correspondence and reports needed for it. The responsible parties check their respective contributions. Outstanding requirements receive a clear task. The proposed start can then be agreed using complete information, without treating an earlier enquiry as confirmation to proceed. For the initial enquiry, state the project address, proposed groundworks with their depth, and the next work step. Mark preparatory drilling, utility diversions or changes to existing foundations. An agreed contact brings together questions about missing plans, unresolved access or differing investigation limits. Further preparation follows these specific tasks.

Check the arrangements again after an organisational change

If the contractor, responsible persons or work area change, the affected part of preparation is reviewed. The necessary records are updated specifically. Existing technical results are retained. Further scheduling follows the updated commission and the requirements actually met for the activity concerned. When agreeing services, the existing information, any research required, preparation, investigation, assessment and documentation are identified separately. Those responsible assign the evidence needed to the relevant groundworks and date. For staged execution, the record states when each area becomes accessible and which results must be available before work there begins.

Method selection

Select methods according to the task and survey conditions

Historical records and aerial photographs

Historical aerial photograph assessment and other old records help place the basis for suspicion in its spatial context. The available images, their evidential value and the limits of the area considered matter. The absence of an identifiable indication must be distinguished from a technically surveyed ground area. The assessment is considered together with the planned intervention and other available findings. It can support the choice of a survey, but is not a measurement of the present-day subsurface or confirmation for all future works.

Understand aerial photograph assessment

Magnetometric survey

Magnetometric methods detect magnetic anomalies. Whether they can address the specific survey task depends, among other things, on the expected objects, ground conditions, interference and required survey area. Fences, utilities or existing structures may affect interpretation. A measurement signal is therefore not described as ordnance solely because of its strength. Method, interpretation and any further investigation are planned as a connected specialist task.

Understand the scope of magnetometry

Electromagnetic methods

Electromagnetic investigations can be suitable for particular metallic targets and site conditions. Their suitability must be explained for the task, rather than inferred simply from the availability of equipment. Interfering installations, accessible areas and the findings required must also be considered. Results are documented with their location and survey conditions. The specialist assessment determines whether a supplementary method is needed; this remains a project-specific decision.

Understand electromagnetic surveying

Ground-penetrating radar

Under suitable conditions, ground-penetrating radar can provide information about subsurface structures and reflections. Ground conditions, moisture, installations and the particular survey task affect interpretability. An anomaly is not automatically ordnance, and an area with no apparent anomalies is not general evidence for arbitrary depths. The specialist interpretation and its limits are documented with the instruction. A survey for another purpose is not adopted without checking as ordnance evidence.

GPR and limitations

Deep-ground and downhole surveys

For deeper groundworks, it may be necessary to establish whether a surface investigation can provide the required findings or another approach is needed. Preparation includes the location, depth, borehole layout and existing services. Creating access for the investigation must also be properly planned by specialists. A general depth figure or standard grid cannot replace that work. Findings remain limited to the areas actually investigated and the method used.

Prepare deep interventions

Survey during construction

If a necessary preliminary investigation cannot be completed, the specialists assess whether a planned approach during construction is suitable. This includes coordinated investigation, interpretation and communication of findings within the intended work sequence. Visual observation of excavated material is not an interchangeable substitute for a necessary survey. Site management needs a clear description of when specialist work will take place, how new findings will be handled and which areas remain unresolved.

Agree the approach during construction
Technical assessment

Clarify investigation information and surveying conditions

Existing aerial photograph evaluation and other records

The Historical aerial photograph analysis and other existing findings help define the technical question for the project. They are related to the planned groundworks. Use them to determine which technical investigation is needed. An equipment list alone does not adequately describe the investigation commission.

Check access, installations and interference

A Surface survey requires an assessment of access and site conditions. Existing installations and possible interference may limit interpretation. Identify unresolved requirements when agreeing the work. Schedules and expected results must account for these outstanding points.

Assess the technical suitability of supervision alongside construction

The explosive ordnance clearance during construction requires a suitable technical task. A preliminary investigation organised late does not by itself justify using this method. The DGUV highlights the limitations of visual observation alone; professional execution requires more than the presence of an observer.

Next steps

From the enquiry to a prepared investigation

01

Complete the enquiry

Provide the groundworks plan, existing findings and outstanding questions. For the initial contact, state the project address, construction phase and forthcoming groundworks. Official statements, historical evaluations and existing investigation reports are reviewed with their appendices for plan revision, areas and depths covered, and outstanding questions about the current task. Incomplete records and differing boundaries are noted for further coordination.

02

Supplement historical information

Where information is missing, the necessary historical research or aerial photograph evaluation is carried out for the construction area. Recorded wartime effects, former uses and later ground alterations are located using available files and images. The findings are related to the current groundworks plan and assessed for investigation planning. Existing information that is already sufficient can be reused.

03

Define the commission

Agree the investigation objective and required services on a technical basis. The specialist contractor assigns the excavation, utilities, borehole locations or other groundworks to the volumes and depths actually affected. The suitable method is determined from the investigation objective, records, access, installations and interference. The service scope, preparation required, responsible parties and handover date are agreed before the work concerned.

04

Perform the agreed investigation

Agree responsible persons, documents and required notifications. The specialist team carries out the agreed survey or technically defined supervision using the agreed method. Data and findings are recorded with their spatial reference and actual coverage. Access restrictions, interference or changes are documented and coordinated through the designated contacts. Necessary notifications are assigned to the specific activity.

05

Assess findings by specialists

The recorded data and findings are assessed against the investigation objective, method and local conditions. A survey anomaly is interpreted technically; detecting it alone does not identify explosive ordnance. Progress, interference, unresolved areas and necessary additions are documented in the report with the associated site plans. This determines the next investigation or coordination step for the planned construction task.

06

Hand over results

Document the work carried out, its spatial extent and further tasks. The handover includes the report and plans showing methods, volumes and depths investigated, results and limitations. Required submission of results to the explosive ordnance clearance service is coordinated with those responsible. Designers and site management compare the forthcoming groundworks with the documented investigation volume. Additions needed for extra areas or changed depths receive technical clarification before execution.

Documentation

What is documented before and after the investigation

Findings and their scope

Before work begins, the records define what is to be investigated and which requirements must be met. After execution, the documentation describes what was actually covered and the resulting conclusions. A notification or order confirmation does not establish that an investigation has been carried out.

Project responsibilities

The General Provisions for Hesse require information about the client, responsible person, start of work and file reference, together with site plans documenting the areas investigated. FONTANA-EOD records the agreed specialist service and its actual scope transparently. Outside their direct scope, supplementary BFR principles provide technical guidance rather than a blanket replacement for local requirements.

Working approach

How FONTANA-EOD works

Document the agreed specialist service clearly

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 task

The task before the equipment

We 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.

Keep limitations visible

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.

Clarify changes before intervening in the ground

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.

Hand over the report and plan together

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.

Understand the results

Use technical statements for the next decision

An acknowledgement of receipt records a processing step

Interpret each response according to its actual content. Receipt of an enquiry initially confirms transmission, whereas a technical statement may provide a different conclusion. An investigation report, in turn, documents work carried out. These distinctions remain visible in the project overview so that the next step is prepared on the correct basis.

Understand investigation reports and their limitations

The construction programme needs technical prerequisites

Alongside the preferred date, identify the documents, access and coordination needed beforehand. Assign a responsible person and a traceable status to outstanding points. The overview supports coordination. A date alone can neither fill gaps in the findings nor anticipate the notifications and decisions required.

Understand the service scope
Design and findings

Documents for the next construction decision

Illustration: aerial photographs and maps on two screens and printed on a desk.

Historical evidence and the current design

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
Illustration: two people review plans and documents at a table beside a construction vehicle.

Specialist reports for site management

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
Person in an orange high-visibility vest with a MALÅ survey cart on a meadow.
Person in a high-visibility vest in front of a marked construction area with piles of soil.
Questions from planning

Questions about preparing an explosive ordnance assessment in Darmstadt

Does an aerial photograph enquiry already constitute a clearance site notification?

No. Darmstadt Regional Council describes aerial photograph evaluation and notification of explosive ordnance clearance as different procedures. The enquiry serves to obtain the official statement for the area. Notification of the planned work requires its own information and evidence.

Which documents does the Regional Council list for notification?

It lists a site plan, a copy of the permit under Section 7 of the Explosives Act and a copy of the certificate of competence of the supervisor on site. According to the published guidance, the permit holder must sign the notification. The current requirements for the specific commission remain decisive.

Does the Darmstadt cycle path example establish a fixed notice period?

No. The city’s notice describes preparation of a particular project at a particular time. For another project, required information, notifications and timing requirements must be clarified separately. The scheduling situation described there cannot be transferred indiscriminately to other commissions.

What matters when the specialist contractor changes?

After the change, check the information about the commission, responsibilities and proposed execution. Pass on the relevant records in full and agree necessary updates with the responsible authorities. The start of work is agreed against the requirements of the new commission; an earlier proposed date is not a commitment for it.

What applies if a possible item is found during preparation?

Stop the work concerned and keep your distance. Do not touch, move or further expose the object. Notify the police immediately on 110 and follow the authorities’ instructions. Never take a suspicious object to a police station or other official premises yourself.

What determines the work involved and cost of an investigation?

The work and cost depend on the investigation objective, area or number of points, proposed depths, available records and actual surveying conditions. Access, necessary preparatory work, staged execution and documentation affect the service scope. To agree the work, provide the current plan revision and the conclusion needed. Official procedures and commissioned private specialist services are considered with their respective tasks.

What should happen when the investigation area is extended?

The new area is shown on the current plan and technically compared with the commission. The relevant records and information are coordinated accordingly.

Which information helps establish a reliable schedule?

Alongside the preferred start, the current technical task, available access, complete records, responsible participants and outstanding requirements are needed.

Project enquiry

Plan an explosive ordnance assessment for your Darmstadt project

Describe the current commission

Send the groundworks plan, existing official statements with appendices and a description of the next groundworks. Identify project contacts, access requirements and the preferred sequence. FONTANA-EOD agrees the investigation required and its preparation with you. Name the specialist bodies already involved and the conclusion needed for the next groundworks.

Identify changes

Also state which earthworks should begin first and which areas are not yet accessible. Necessary preparatory work and handover of results can then be coordinated in good time. Identify changed responsibilities, dates or work areas with the current plan revision. Add existing utility and site plans, known conditions and any appendices still missing.

Project enquiry

Have your project assessed

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.