A proposal to appropriate $58.4 million for a new elementary school in Hanson is the key item of business set to come before the Special Town Meeting that convenes on Monday at 7:30 p.m. at the Middle School. The Massachusetts School Building Authority has committed to funding 59.17 percent of the project’s eligible costs. Approval of the article would be contingent on passage of a debt exclusion, or temporary tax increase, to fund the town’s share, at a special election tentatively set for Nov. 16. The project calls for replacing the Maquan and Indian Head elementary schools with a new 800-student, pre-kindergarten to 5th grade school. The Special Town Meeting will also consider adopting a temporary moratorium, through June 30, on medical marijuana dispensaries, allowing the town time to develop zoning rules governing those facilities. The meeting will take up a number of other spending requests. Included are appropriations from the Community Preservation Fund to upgrade three Little League fields at the Botieri Field baseball complex; for exterior renovations to the historic Bonney House; and to purchase the Harris Stone Properties, 115 acres of land on West Washington Street; a separate article would authorize that land purchase. Other spending issues include requests for projects to repair the septic system at fire headquarters, to renovate the Factory Pond Dam, and to replace a storm-damaged water main.