Part A - Introduction 
9 
Construc 
tion 
Fundamental 
design 
(basic 
design) 
- The scope of the 
geotechnical survey 
and studies, and the 
choice of investiga 
tion methods is 
determined by the 
type, size and im 
portance of the con 
struction of the wind 
energy plants/sub 
stations, the uni 
formity of the struc 
ture of the ground 
conditions, the mor 
phology of the sea 
bed and existing 
ground types. 
- The area under in 
vestigation must 
also take possible 
deviations from the 
plan into account 
with regard to the 
location of struc 
tures. 
- The structure of the 
ground conditions 
and the sediment 
characteristics must 
be individually 
recorded for each 
construction site. 
- Review and assess 
ing available sup 
porting documents; 
- Direct explorations 
by drilling at the 
sites of the offshore 
structures; 
- Indirect explorations 
by probing at the 
sites of the offshore 
structures; 
- Laboratory tests via 
sediment samples 
on sites 
- Main geotechnical 
investigations (drill 
ing and/or probing, 
laboratory and/or 
field tests); 
Supporting docu 
ments to be submit 
ted in connection 
with the basic de 
sign: 
- Main geotechnical 
site survey report, 
- Soil and foundation 
expertise, (Con 
struction phase) 
- Supplementary re 
port regarding cy 
cles, 
- Geotechnical evi 
dence of structural 
safety and suitability 
for use 
All documents audited 
by an inspector 
Implementa 
tion planning 
- Final design of the 
structure; 
- The necessary stud 
ies depend on the 
type of foundation. 
They must be suita 
ble in type and in 
scope for establish 
ing all dimensions of 
the foundation and 
to keep all records 
appertaining to 
structural safety and 
suitability for use 
- Supplementary 
direct exposures at 
the sites of the foun 
dation elements; 
- Supplementary indi 
rect explorations at 
the sites of the foun 
dation elements; 
- Laboratory tests via 
sediment samples 
on sites; 
- In certain circum 
stances pile driving 
and pile load tests 
may be carried out 
Supplementary explo 
ration and investiga 
tion 
Supporting docu 
ments to be submit 
ted in connection 
with the final plan 
ning documents: 
- Supplementary re 
port regarding cycli 
cal loads in the con 
text of the Standard 
Design audited by 
an inspector