Alex,
Thanks for replying. You wrote,
First of all, coffees that are sold throughout the supply chain beginning at the farm level are 100% Rainforest Alliance Certified and there is no allowance for coffees traveling from farms to exporters to importers and to roasters to be less than 100%.
There is some sort of problem, then, with producers (or RA reps) not understanding this rule. At the conference I attended, one of a number of producers in the room asked, "How much are we allowed to mix in without penalty?" and the RA rep answered, nearly verbatim, "I'd have to check, but probably the same amount roasters can mix in, about 10%". A big roomful of people walked away with the same impression I did. Hopefully, this was a one-time dispension of bad information -- is that what you are saying? Just to be explicit: No mixing allowed at the farm level, period?
The rest of your explanation provides your reasoning for the "slippage allowance." You said,
The 90% labeling threshold is based upon the fact that many large roasters do not batch roast, but rather roast with a continuous flow of coffee throughout the factory. The labeling requirements ensure that the 100% coffee equivalent is purchased, but allows such companies to use their funds to invest in certification, farmers and the environment rather than in separate roasting facilities.
It sounds to me that you are describing the same situation Tim did when providing an example from cocoa/sugar, only at the roaster rather than the mill and with a 90% limit. Here's Tim's description:
Farmer A brings in 1 ton of FT cocoa or sugar. The mill won't process less than 4 tons at a time. It is entirely acceptable for the mill to add Farmer B's 3 tons of non-FT cocoa/sugar to the 1 ton of FT cocoa in order to justify turning on the machines and process the cocoa/sugar
The resulting pile is just under <4 tons of processed cocoa/sugar. It is legitimate under current FT policy to sell 1 ton of this as FT, even though it has been blended with 75% non-FT cocoa/sugar. The balance may not carry the label.
Organic, FT, and Bird-Friendly do not have a slippage allowance, according to their representatives. Apparently, these coffees are processed by roasters that do not have separate facilities, as you indicated would be necessary without the rule.
I'm not a coffee professional, so perhaps I'm missing something here, but I don't know that we are any further along than where we started.
Can you point me to a link to a PDF of sample agreements between SAN/RA and producers and roasters? Maybe it would make more sense for me to see the actual rules in writing.