Alaska Dispatch by Rena Delbridge.   ...two new bills hit the Senate on Monday, delivering, as promised, a major change to the state's oil and gas tax structure as a pipeline open season approaches.  The bills, SB 305 (.pdf), and SB 306, would tax oil and gas separately instead of as a combined resource. Senate President Gary Stevens (NGP Photo-l) , R-Kodiak, took the unusual step of referring the bills to only one committee. Typically, bills are sent to three for hearings.  Some lawmakers -- most vocally, Sitka Republican Sen. Bert Stedman (NGP Photo-l) [...]