O.K. I'll jump in. . .
I have a basic problem "compacting" a natural soil subgrade. In the absence of geotechnical data, you may find that the natural soil is pretty strong (i.e., suited for subgrade support), but the natural moisture content is over "optimum." Now what's the contractor obligated to do? Scarify and dry?
If you just tell the contractor to compact (and it's naturally at 93 percent compaction), he'd likely do what's required and turn the site into mud. For what purpose?
A proper geotechnical study should provide a basis to design a pavement on the soil as it exists. If the natural soil is that soft, then an undercut or soil raft (i.e., with geotextile/grid) may be needed. If the soil has some natural strength, then I'd just do a proofroll with a fully loaded 10T dump truck and address those areas that rut, weave or become otherwise disturbed. After some surgical repairs, I'd then go in with my pavement section - in this case using dense-graded aggregate.
I'll point out that an aggregate road will be prone to infiltration and the water will perch on the subgrade soils (i.e., 10-in below the driving surface) and you may likely get post-construction disturbance irrespective of whether you compact the subgrade or proofroll in advance. As a engineering measure, you may want to consider open-graded aggreagate, drainage relief and a top surface of dense-graded aggregate.
Then again, I don't know the overall objectives of your project.
f-d
¡papá gordo ain’t no madre flaca!