Retrograd: OK, OK I jumped before looking.
Neukcum: A different log by far. The earlier log had deep fill, which is not shown as being well compacted, leaving it open as to possible down drag problems. At that site you can use the blow count to compute the ultimate down drag that might occur. You also will have to be concerned about the apparent support that the fill supplies during driving of piles, which may not really be there in the long run, and may actually later be an extra load to be carried.
With regard to a geotech, my experience is that they (myself included) supply all the design info to the structural engineer. Under the circumstances you have, it would appear that they only supply the boring and test data leaving others to use it as they may. That's sort of like my neighborhood auto repair facility telling me that they will furnish the lift, the tools and the parts, but I am on my own to make the automobile repair I came in for. In my case, I probably can live with that, but that is the last time I use those guys.
In your case, it would seem a different geotech should be involved. Where I live (USA) the structural engineers usually do not want to do any interpretation of site data, but leave that up to the hired geotech as his part of the overall design and build process. It's the main part of his report. There are legal and professional risks with foundations and the wise thing I recommend is leave the interpretation and design recommendations to those most qualified. At each of those sites you have, I'd give the geotech the pile load and have them recommend the best pile type and their estimate as to how deep they might go.
I'd go to your mentors and explain the difficulty you are in and the waste of time involved with a phase of the work someone else should do. If you are to do this phase of the work in the future, have them send you off to a series of geotechnical seminars and perhaps a few terms at college learning geotech engineering. You won't learn all the tricks and problems that need solving, but also hopefully a geotech mentor (not necessarily a structural) to guide you.
As an example now ask your "mentors" what their experience tells them when a very deep fill has to have piles driven. Even that seminar or soils course will have difficulty giving a dependable answer. An experienced geotech is more likely to have had such an experience. Have they ever pre-loaded such as site and used footing foundations? I have. That site you have is most unusual and beginners should not be assigned the job of doing the design.
