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Part C - Minimum Requirements on geotechnical investigations 
4.2.2 Presentation of the results of field and laboratory tests 
4.2.2.1 Field investigations 
All surveys sites shall be illustrated in a site plan, and the findings shall be shown at the cor 
rect scale in accordance with DIN 4023 and the DIN EN ISO 22476 series of standards. These 
must result in an overall view of the various strata as well as discontinuities and local features 
in the soil which is necessary for design development. The site-based water depth and the 
associated reference system (e. g. chart datum (LAT), MSL) should be specified. 
The measuring systems used for measuring exploration starting points shall be described and 
measurement uncertainties, tolerance and reference systems (e.g. chart datum (LAT), MSL) 
shall be stated (Note: the findings should be contrasted if several measuring systems are 
used). Also reference dimensions in relation to fixed points or reference lines shall be included 
as well as comparisons of target/actual co-ordinates. 
The dates of the field investigations and any special observations made during drilling inspec 
tion shall be noted. 
The methods used for drilling and sounding have to be explained in the geotechnical site sur 
vey reports submitted. If standardised methods have been used, reference to the standard is 
sufficient. In case of deviations from standard procedures reasons have to be provided, and 
the method used has to be described. 
The geotechnical site survey reports shall include, as a matter of principle, the field reports of 
the borings carried out according to DIN EN ISO 14688-1, DIN EN ISO 14689-1, and DIN EN 
ISO 22475-1 and a report for measuring the exploration points in accordance with IHO (2008) 
for Order 1 surveys shall be included. If this is not possible in exceptional cases, a note shall 
be included stating that the reports can be inspected and where they can be inspected. The 
latter applies also to the soil samples taken. 
If core samples have been taken, colour photos of the drilling cores shall be enclosed. Such 
colour photos do not replace an analysis and evaluation of the soil samples by an expert at 
the laboratory. 
The data from penetration testing shall be documented taking into account DIN EN ISO 22476. 
As well as specifications for calculating, correlating and interpreting (classification) of sound 
ing results, specifications regarding measurement accuracy or tolerance of the measuring 
procedures used as well as documenting protocol for calibration and quality control. It is rec 
ommended to plot the data from penetration testing against the drilling logs at the same loca 
tion using a common reference system for height data (i.e. chart datum (LAT), MSL). 
For construction measures in rock, discontinuities should be illustrated such that the relative 
frequency of individual directions of division surface is readily seen. Frequency, degree of 
separation, solidity and width of openings in the interstices should all be described. 
All exploration sites with notes regarding gases and pollutants must be illustrated in a site 
plan. Concentrations should be drawn up in a table and in a drawing with temporal trends. All 
data that is important for assessing samples and for analysis shall be contained. The analysis 
procedures shall be named and reasons given if necessary.