Tom, did you find what you were looking for? I'm a bit late to this thread but I have installed a lot of outdoor fiber. Nailing down the specs is fairly simple once you determine if you should have loose tube or tight buffered. That choice depends on how long of runs you are looking at, if its terminated in an indoor rack or a junction box on a pole out in the weather, and your cost of labor and availability of skilled terminators.
Since you stated conduit I'm assuming the run isn't over a few hundred feet, plus 12 strands is a fairly low number, so tight buffered is probably the best option. Make sure that the fiber you choose has an NEC Chapter 8 jacket type that can be run more than 50 feet indoors. Tight buffered terminates more easily than loose tube, but loose tube is cheaper. My fiber runs are outdoors in a refinery between control houses, instrumentation shelters, and substations and range from 400 ft to 8500 ft. At these distances and 24-36 fibers per cable loose tube makes the most sense.
