well, as an architect student this post is kinda tingle my brain
soooo I tried to answer this
(finger crossed and wish me luck)

Volume
3.7 x 5.0 x 0.6 = 11.1 m3

in accordance with data in your previous post then can be counted as

Workers
0.030 x 11.1 = 0.333
Overseer
0.010 x 11.1 = 0.111
Common Ground
1.200 m3 x 11.1 m3 = 13,320 m3

yet to complete the manual compaction work can be counted as

Workers
0.500 x 11.1 = 5.55
Overseer
0.050 x 11.1 = 0.555

SO, here’s the conclusion
Workers needed 5.883 or 6 person
Overseer needed 0.666 or 1 person
Common Ground 13,320 m3

Total labors needed is about 6 or 7 person.