Errors , Ambiguities and Omissions : Any errors ambiguities and omissions in drawings and specifications shall be reported to the Owner and/or Agent for correction before any part of the work involved is started. Unless otherwise expressly stipulated, no additional allowances will be made in the Contractor's favor because of errors , ambiguities and/or omissions which should reasonably have been discovered by him during the preparation of bid estimate and directed to the attention of the Owner and/or his Agent in a timely manner. The written decision of the Owner and/or his Agent will be final.