Teil B - Minimum Requirements on geological survey 
15 
• For geophysical methods a minimum resolution of 1 m is required close to the surface. 
• The composition of the seabed in the planning area should be sufficiently captured down to 
the foundation depth with suitable geophysical methods. In areas with a gas or basin effect 
where seismic procedures (partially) fail, ground conditions can be sufficiently captured on 
the basis of geotechnical extraction processes (boreholes and cone penetration testing). 
• The findings from geophysical investigations or the interpretation thereof must be checked 
on the basis of sufficient boreholes and cone penetration testing carried out in the course of 
the preliminary geotechnical survey. Seismic units are to be connected with the lithological 
soil profiles. 
• An initial assessment should be submitted as a preliminary geological report (Stage 1 - see 
Part A, Table 1). An interpretation of the geophysical investigations based on the findings of 
the preliminary geotechnical survey must be prepared and assessed (Stage 3 - see Part A, 
Table 1) for the geological report (Stage 4 - see part A, Table 1). 
• Raw data should be saved in digital format. 
• Maps (locations of sections and boreholes, survey tracks, etc.) should be submitted digit 
ally in GIS or CAD format, preferably as shape files. 
• The applicant or approval holder is responsible for long-term data archiving including clear 
documentation of said data. 
3 Chronological order of events 
1. As a basis for planning the site survey a detailed literature review must be drawn up in ac 
cordance with DIN 4020, which contains all available and relevant information regarding 
water depths, geological and hydrographical conditions, existing cables and pipelines in 
the area, other structures, fishing activities, maritime transport, leisure activities, ordnance, 
protected and prohibited areas in the area or surrounding areas of where the offshore 
structures are planned to be located (desk study in accordance with Part A, Table 2). 
2. Bathymetric and geophysical investigations (multi beam survey, side scan sonar and seis 
mic recordings as well as magnetometric investigations) must be carried out in the planned 
area whilst taking the planned sites into consideration. 
3. An initial interpretation of the geophysical investigation findings should be submitted as a 
preliminary geological report (Stage 2 - see Part A, Table 1). The preliminary geological re 
port can be oriented towards the geological report in content terms, see Part B, Sec 
tion 7. 
4. A calibration of the seismic results should also be carried out based on direct and indirect 
geotechnical methods such as e.g. boreholes and cone penetration testing from the pre 
liminary geotechnical survey, the location of which is expediently coordinated with geo 
logical survey. The interpretation of the seismic results must therefore be checked based 
on the findings of the preliminary geotechnical exploration and be revised in case of con 
siderable déviances if necessary. 
5. The geological report must be submitted to the approval authority along with the certified 
documentation for the first release after all investigations have been concluded. 
6. The findings from supplementary geophysical investigations which arise as a result of cali 
brating seismic investigation findings must be integrated in the main geotechnical site sur 
vey report (Stage 5 - see Part A, Table 1). 
7. The findings of the geological investigations in the monitoring phase must be submitted as 
a inspection report.