The Zoning Board of Appeals may, in its discretion, grant a special permit to the owner of a lot, or to the lessee or licensee of an owner, to store, repair and maintain equipment, trucks and other facilities for use in a federal, state or county construction project. Said special permit shall not be effective prior to 20 days before the letting of the contract for the performance of which said equipment, trucks, and other facilities are to be used, nor later than 20 days after said contract has been performed, nor in any event after the Zoning Board of Appeals shall have determined that such use of the premises is no longer necessary for said project. The special permit may include the right to erect a building or buildings for said purposes. Said special permit shall require said owner, lessee or licensee to file forthwith, with the Town Clerk, a written agreement with the Town of Longmeadow that, within 60 days after the expiration of said special permit, he will restore said lot to its condition prior to the issuance thereof. Said agreement shall be in such form, with such sureties, as the Select Board shall determine.