Forty feet of black 6 inch Waste, Drain, Vent pipe run up to just 3 feet above the gutter line will do everything he needs it to and the odds are really good that the township won't even ask about it.
A rain hat on top and a cleanout tee at the bottom and Bob's your uncle.
You will want a pretty strong fan to move the volume you need through that small of a diameter due to the static pressure losses but he will know about that.
For that matter he can run the stack outlet around several corners to get it away from occupied areas.
He could disguise it as a sump pump out let and run it out to the street curb.
Perhaps research along the lines of Radon mitigation will give him some answers.
The trouble with a buried stack is going to be critter nesting and moisture collecting but it is doable..
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