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? If the District shall not have awarded a contract or con­tracts for the performance of all of said work within said 18 0 -day period, the First Parties may thereafter award a contract or con­tracts to the contractor or contractors they deem to be the lowest responsible bidder or bidders, said contract or contracts to pro­vide for the performance of any of said work for which the District shall not have awarded a contract or contracts. If the District shall fail to complete the performance of all or any portion of said work within two (2) years after the sale date or within two (2 ) years after the First Parties have approved the plans and spe­cifications, whichever date may be later, the First Parties may thereafter award a contract or contracts for the completion of any work then remaining unperformed. If the First Parties shall award a contract or contracts pursuant to this Section 5 after the D i s ­trict shall have contracted for or acquired materials for the work to be performed pursuant to this Section 5 which materials have been, or are to be, paid for from the Relocation Fund, the First Parties shall be entitled and required to use said materials in the performance of any contract or contracts awarded by them. Any contract or contracts awarded by the First Parties shall provide for the performance of the work in accordance with the plans and specifications submitted by the District and theretofore approved by the First Parties, or in the event the District fails to submit plans and specifications or the plans and specifications submitted shall have been theretofore disapproved by the First Parties, in accordance with the general specifications contained in subpara­graphs (a) to (l) inclusive of this Section 5* Any contract or contracts let by the District or the First Parties pursuant to this section shall require the contract­or to promptly commence and diligently prosecute to completion, in a good and workmanlike manner and in accordance with sound engin­eering practice, the work referred to in said contract or contracts. The contract or contracts for the removal of the pipe lines and wire lines described In subparagraphs (h) to (l) of this Section 5 shall provide that all salvageable material removed shall be transported to and placed at such point or points upon the lands described in subparagraph (a) of Section 1 as the District may designate. E i ­ther party to this agreement shall be entitled to appoint a repre­sentative or representatives to Inspect any work during the course of construction to see that said work is performed in accordance with this Section 5* Said representative or representatives shall be given access to all work areas, work in construction, materials and equipment which are necessary for the performance of said work. It is agreed by the parties hereto that the estimated eost of the work to be performed pursuant to this Section 5* ex- 18.