Explosive ordnance surveys in Koblenz for utility routes

A historical aerial photograph analysis must be compared with the route's spatial scope. Check whether additional connection areas and excavations are also covered by the sources analysed. Identify missing documents and differing investigation limits. The street name alone does not demonstrate coverage of every area.

For tendering, the investigation task and expected result documents are described for each section. Existing reports, accessible areas and preparatory work still needed form part of the service basis. Method and work scope are agreed by specialists on this basis. The specification also identifies measurement data, plans and analyses to be handed over. Services for areas still closed or accessible only later remain identified. If a change occurs, the affected scope is updated so that clients and contractors use the same plan version.

For explosive ordnance investigation before construction in Koblenz, the area analysed and construction corridor actually planned are considered together. For documents from different dates, positional reference, present property boundaries and known ground changes are clarified. An earlier utility route may differ from new planning. Launch and reception pits, shaft enlargements, trench shoring and lateral work areas required also belong in this comparison with their interventions. For a section not yet determined, explicitly identify the planning decision needed before investigation is commissioned.

For a surface survey, accessibility, existing installations and interfering metal objects are among the relevant factors. These conditions may change along a project. Therefore check, for individual sections, which findings the chosen method permits and where supplementary or different investigations may be needed.

When investigating suspected ordnance land in Koblenz, existing utilities, reinforcement, foundations and larger metallic installations are considered with their location. Their significance for interpretation is determined by specialists. Under suitable conditions, ground-penetrating radar can provide supplementary information about subsurface structures; a depicted structure is assessed according to the investigation task. A suitable combination of methods follows the target objects and findings actually achievable. For a specialist task requested as borehole clearance certification, point location, depth reference and scope of findings required are determined before commissioning.

An explosive ordnance survey during construction must not be equated with merely observing excavated material. DGUV regards visual observation alone during preventive explosive ordnance clearance as not meeting the state of the art. If a survey during construction is considered, specialists must clarify its suitability, prerequisites and investigation sequence. A short interval between two construction sections does not alone justify this approach.

For the proposed construction section, investigation sequence, interpretation and communication of findings are agreed before work begins. Participants know when specialist work takes place and which response is required before the next ground intervention. The stop signal, reporting channel and responsible contacts are identified. A contractor change or short-notice relocation of the work site is assigned to the specialist task affected. Outstanding areas remain identifiable on the site plan until further investigation needs are clarified and work actually performed is documented.