542Contractor Proposed Alternate to Reinforced Concrete Deck Girder This specification covers design requirements for superstructures proposed by the Contractor as a lternates to cast -in- place reinforced concrete deck girder structures. This work is limited to construction using precast reinforced or precast prestressed concrete stems, including AASHTO Type I beams. For areas not specifically covered in this specificat ion, refer to the applicable portions of the project specifications, Standard and Supplemental Specifications of the Department, and Part I of the AASHTO Specifications for Highway Bridges with interim and Guide Specifications. General Provisions 101 through 150. Section 105