I think that this issue is being addressed in Eurocode 7, BS EN 1997. Not much use for those who don't use it other than as a reference. In the Eurocode, they make a clear difference between the Geotechnical Interpretive Report, and the Geotechnical Design Report. Geotechnical organisations can complete the first, but the second report includes detailed design which in the UK most smaller Geotech [read GI/SI] companies don't/can't fulfil all the requirements. This should mean that the first report [interpretive] is used to write the second [design] and therefore the interpretive report does become 'bound up' within the overall design and specification. Its still in its infancy so we will see how it resolves itself, however in the UK we do place a great deal of emphasis on the SHW, and even BS EN 13242, via PD 6683, refers to the SHW. As such most contractors are familar with it, and interpretting the SI data in conjunction with the SHW is relatively straight forward adn common practice. However saying all that, the teeth are in the Design report, not the Interpretive.