Explosive ordnance detection for cycle paths and transport infrastructure

Specialist assessment should begin as soon as the route corridor, construction sections and proposed ground interventions can be identified. For roadside, independently routed and urban cycle paths, historically suspected ordnance, working width, excavation depth, crossings, drainage, lighting, retaining structures and existing utilities must be brought together before tendering. This allows early assessment of suitable investigations for areas, deep individual points and remaining zones.

The cycle path formation, verge, drainage swale, cable trench, lighting foundation, retaining wall, crossing, bridge ramp and site establishment affect different areas and depths. Measurements within the future path route do not automatically cover lateral utility alignments or deep mast and shoring points. Each working volume is therefore clearly described by location, width, depth and construction method.

If an unexpected suspicious object is found, stop work. Do not touch, move or uncover it further. Leave the immediate area and warn others without putting yourself at risk. In Germany, notify the police on 110; outside Germany, use the local emergency reporting procedure. The competent authorities determine what happens next; a project enquiry does not replace reporting the find.

Root zones, existing trees, slopes, fences and adjacent traffic areas may restrict survey lines and equipment access. Planning distinguishes accessible survey areas, deep individual points and sections accessible later. Necessary investigations and protective measures are specified before ground disturbance during vegetation clearance, demolition or breaking out. Interventions in root-protection areas are coordinated with construction and environmental planning; unrecorded areas remain unresolved.

Effort, duration and cost depend on route length, working width, intervention depth, surface, vegetation, existing utilities, deep individual points, accessibility, traffic phases and documentation scope. New crossings or relocated ancillary installations may require supplementary investigations. A site plan, typical cross-section, point schedules and construction phases are needed for costing.

A deep-ground survey becomes relevant where lighting columns, signs, retaining walls, railings, bridge connections, chambers or other elements extend deeper into the ground than the reliably investigated near-surface zone. Point location, foundation dimensions, target depth and installation method determine the investigation volume. Whether existing area measurements suffice or a deep-ground or borehole survey is needed depends on the demonstrated detection depth and actual survey conditions.

The documentation should clearly show the route, chainage, construction section, working width, intervention depth, method used, survey coverage, interference and excluded areas, anomalies, findings and subsequent decisions. With several construction sections, drawing revisions and partial handovers must remain traceable. Designers and site management can then identify the area to which the conclusion applies and where further measures are needed.

Helpful documents include site and route drawings, chainage, a typical cross-section, construction sections, maximum excavation depth, crossings, lighting and drainage points, utility drawings, existing trees, any existing aerial photograph assessments, correspondence with authorities and the requested date. Incomplete documents are also suitable if they show which working volume is to be planned or tendered next.

Information and requirements from authorities are supplied with their date, complete appendices and geographical scope. In Germany, the competent ordnance disposal service, local public-order authority and, where relevant, building-control authority are identified for the project location; outside Germany, local responsibilities apply.