Explosive ordnance surveying in Stuttgart

The Historical aerial photograph analysis provides findings from the documents assessed. The Baden-Württemberg KMBD states that its preliminary investigation generally applies to the underlying construction project. Check whether area changes or a changed task still correspond to the existing documents; current official guidance must be considered.

Where historical information is missing, the necessary research and aerial photograph analysis are commissioned for the specific area. Existing statements, map appendices and later investigation reports are brought together. For an area suspected of containing explosive ordnance in Stuttgart, describe which questions have already been answered and which remain to be investigated. Also draw the planned excavation boundaries, utility alignments and boreholes. For changed areas or construction tasks, further use of an older preliminary investigation is agreed with specialists and, where applicable, the KMBD before the works affected.

During a Surface survey, local measurement conditions must also be assessed. Terrain, accessibility and interfering installations may affect the conclusions. An area previously inaccessible must not appear as investigated in the results. Specialist planning determines whether another method or separate work is required.

Method selection follows the investigation objective, soil profile, existing utilities, metal installations and depth range required. For excavations, pile foundations, shoring and deep utility works, the respective starting points and end positions are described. Any required deep surveying or borehole clearance is assigned to the specific ground disturbance. The drawing states whether depth is measured from the present ground surface or a later working level. Limitations caused by inaccessible areas or interference remain visible in the analysis and results plan. The Surveying is matched to this investigation commission.

For inclined boreholes or anchors, state the direction and lateral extent as well as the starting elevation and final depth. The volume of ground needed for investigation may therefore extend beyond the area shown as a vertical excavation. Draw such ground disturbance in plan and section and identify the associated construction sections. For shafts, sumps or deeper foundation elements, identify additional low points individually. The specialist planner can then check which areas an existing investigation result covers and where supplementary work is needed before construction.

According to the DGUV, ordnance surveying during construction is not simply visual observation of excavator spoil. If investigation is to be combined with progressing earthworks, suitable prerequisites and a coordinated investigation sequence must be in place. Even when ground is being removed, the investigation method needs a technical justification.

For suitable excavation monitoring, the investigation sequence and earthworks are coordinated. Before the next section, site management must be able to identify which area was addressed with which method and what limitations remain. Changed excavation bases, deeper shafts or additional drilling are communicated to the specialist planner. During phased work, handover points are agreed with those responsible. A possible find leads to stopping the affected works and immediate notification through the responsible bodies.