The Northwest Alliance, a group formed to protect Northwest Creek and Harbor, Barcelona Neck, the Grace Estate, and the environmental quality of areas in East Hampton’s Northwest Woods, has asked candidates for East Hampton Town Supervisor and town board to answer a short list of questions on water quality, the dredging of Northwest Creek, and aircraft noise “in the hopes of building a consensus on the urgency of the protection of this area,” according to T. James Matthews and Patricia Hope, members of the alliance’s steering committee.