302 Agreement-Contd . SEVENTIETH CONGRESS . SESS. I. CH. 200. 1928 . tha t any contrib ution or asse ssment, which may be arrang ed by either party to be paid by a county, township, or municipality within the respective States, shall be guaranteed by the respec- tive parties hereto and that all payments and transactions in the handling of the construction of this project shall be directly between the parties hereto, each of whom agrees to act as its own collecting agent in dealing with the other contributing parties in the ir res pective States . 4. All contracts shall be let jointly by the first and second pa rties hereto, who sh all jo intly c onstitu te the first party t o all such contracts and no contracts shall be let until after formal approval of awards by each party . The work of construction shall be administered under the joint supervision of the first and second parties as first party of all of the aforesaid contracts to be let under the terms of this agreement, but the second party hereto agrees that its inspection and supervision shall be admin- istered through the representatives of the first party and not through direct dealings with the contractors, and that any mat- ters of dispute in regard to the administration of the contracts sha ll be adjuste d joint ly by the bri dge eng ineers of the respec tive parties hereto . Each party may retain such engineering assist- ance in supervisin g the work as it may deem n ecessary and the cost of such engineering, including office work and administra- tion as may become necessary, shall be considered a legitimate charge to the project . Estimates to the contractor shall be paid direct by each party hereto, each in the amount of 50 per centum of the total estimated amounts due under the provisions of the specifications of the first party and as approved by the second party , all estimat es being prepa red by the fi rst party at two week intervals or thereabouts, approved by the first party and submitted to the second party for approval, the second party making payment direct to the contractor on approval of esti- mates a nd the first party likewise making payme nt to the con- tractor on receipt of copies of the estimates after being approved by the second party. Authorizations for extra work will be handled in the same manner as the original contracts . The engineering costs on this project will be considered as including expenditures made by each party prior to the date of the execu- tion of this agreement as well as all such costs subsequent thereto . 5 . The work to be covered by this agreement is further indi- cated i n an approxim ate preliminar y estimate of cost known as Exhibit B, based on Exhibit A, attached herewith and considered as an integral part of this agreement . This estimate is for preliminary budget purposes, it being agreed that the shares of the respective parties shall be based upon the actual cost of the work. 6. For the purpose of future maintenance it is hereby agreed that the first and second parties shall, upon completion of this project, each maintain that portion of the pro ,j ect (or bear the expense of doing so) which lies north and south respectively of the center of the third span measured from the north end of the river struct ure . 7. That the first and second parties shall, through their respe ctive United Stat es Sen ators and Co ngres smen f rom th e districts within which the project is situated, take the necessary steps to secure the approval of the United States Congress at the 1928 session, authorizing the construction of said project,
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