Ron, I can't answer your (Il) question specifically, hopefully someone
else will.

 But.

 I did OW in Florida and moved home to Tennessee.

 Quarries are everywhere, Illinoisans are frequent to Gilboa in Ohio.

 http://www.divegilboa.com/

 Myself, I dive lakes, rivers and quarries as well.

 It was quite a shock, though, water temps, -very generally- in the 50's &
60's, can be   down to 40's.

 Very generally, 10 to 30 ft viz, with near zeeeero viz not being uncommon.

 5 and 7 mill wetsuits and drysuits common.

 But that was 600 dives ago, and a better diver I am for it.

 I think the most important thing would be for your guy to find a good LDS,
and experienced local divers to hang with.

 As far as varying his training?

 Make sure he knows how to -properly- , -repeatedly-, reconfigure
weighting, get him some thick rubber and swap in a steel tank and let him
work it.

 Getting used to a thick wetsuit isn't easy.

 Get a blackout mask, or get him very comfortable without a mask (I had the
benefit of both).

 Get him in some close quarters at night, liken under the docks at Singer
Island marina was helpful (and bug heavy, IMA).

 Once I got used to the temps, it was cake for me, and it would scare a lot
of people where I'm willing to dive now.

If he's smart, he'll get on a plane and fly to someplace warm for his
diving.

Lee

Mermet Springs, Illinois - not KY

there is s spring in Northern KY that some of the dive shops go to -
I'll find the name

Come up and dive the Great Lakes.  Lake Michigan may not be as warm as
Florida, but we have the best wrecks you will find anywhere and thw
visibility sis a whole lot better than the quarries the LDS's use for
training dives.

Safe diving,
Cpt. Dale