Everything I have read and been told says your biologist told you wrong. Lime doesn't move much within the soil and should be incorporated into the top 3-6 inches of soil. If your lime does happen to leach 1 inch and your forage grows roots 6 inches deep, the acid soil below 1 inch would have to be a problem for your crop.
I agree too.
When I get my soil tests back from the state extension office, it has a lime recommendation along with some other literature. The literature says something like "all lime recommendations are assuming an 8 inch incorporation". If you only incorporate, say 3", there is a table of correction factors. example. suppose the the suggested amout of lime is 2000 lbs per acre. with 3" of incorporation, i would just need to apply 750 lbs of 100% lime.
of course, the lime at the quarry is only 62% ECC. so that would bump me up to around 1200 lbs / acre.