I was going to ask the same question about the availability of an analysis as well. Chances are that there's a good load of N and it may be in a form that microbes do not need to mineralize it.
The problem with chemistry reports is that they tend to show only what nutrients are immediately available.
I have no direct experience in using bio solids and we do not sell anything that contains them, but my opinion is that it has to go somewhere. Nature tends to hate anything in great concentration.
You have the right idea about putting it down gradually. It sounds like there quite a nutrient load there! Try to post some pics in another 10 to 14 days!