Wiring 2 outlets to 2 dedicated 20 amp circuits with a single 10/3 electrical wire.

Here's an idea (and it is code compliant), using one 10/3 romex electrical wire (three insulated conductors, and a bare ground wire - 10 gauge), you can wire two outlets to a double pole breaker (and yes the legs would not be the same, which on a quiet electrical system is not a big deal).
 

In this situation, 2 hot wires from the outlets would be wired directly to each of the circuit breakers, the neutral would be bridged between the two outlets and then connected to the appropriate spot on the panel, and the grounds for each outlet would be attached to the single ground wire that goes back to the panel.  This would all appear within a quad outlet wall panel (ie. Two 20 amp outlets side-by-side)

For a long 70 foot run this seems prudent thing to do, less costly and kosher.