An enexpensive solution for keeping odor in and water out is the Lockdown-Lockdry manhole security lids that you can find here:
http://www.lockdown-lockdry.com/
It's been my experience that once you have an odor problem with a manhole, it can be very expensive to remedy via removing the source...
Thanks for the tip. However, when I try to download that manual their link does not work. I browsed their FTP contents but still can't locate #15. Any other places you can get it?
I am looking for a good source or chart/table for presumed/probable bearing capacities of various compacted fill soil types at various compaction (90% to 95%) specifications.
Any help locating a source would be appreciated.
bearing capacity in rock:
http://www.usace.army.mil/inet/usace-docs/eng-manuals/em1110-1-2908/c-6.pdf
The us army field manuals and chapters are a great source of formulae and definitions and they are all available online:
http://www.usace.army.mil/inet/usace-docs/eng-manuals/em.htm