HOUSTON, Oct 17 (Reuters) - Portland gasoline traded at a35-cent a gallon premium to the NYMEX RBOB contract onMonday, up almost 16 cents from Friday's levels as the remnantsof Typhoon Songda stoked regional supply concerns.
* Tesoro Corp and Phillips 66 on Monday saidoperations were normal at their refineries in Washington
* Operations were also normal at BP's Cherry Pointrefinery, according to a source
* Shell, which also operates a refinery inWashington, did not immediately respond to a request for comment (Reporting by Liz Hampton)