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being understood that unless the parties can agree on the type of said 24-inch and 8-inch pipe lines within ninety (90) days after such written notice, Union Pacific shall construct such pipe lines pursuant to good engineering practice and of the capacity herein­above mentioned in this subparagraph (b), (c) to relocate the pumping station now located at point HH to a new location shown in solid green square on Exhibit "A-l”- near point R. (d) When the said new pipe lines have been con­structed and the said pumping station relocated as provided in subparagraphs (a), (b) and (c) hereof, Union Pacific shall have the right to connect the said pipe lines with the existing transmission facili­ties of the District so as to render unnecessary the f use of the pipe lines shown by broken black and red lines between points marked A and K, A and E, and R and HH. When said new pipe lines shall have been connected into the transmission system of the Dis­trict, the Union Pacific shall have the right to disconnect from said transmission system and to re­move the said pipe lines shown by broken Hack and red lines between points marked A and K, A and E, and R and HH. Union Pacific shall credit the salvage value, if any, of the material removed, less the cost of removing and disposing of the same, upon the total cost of the work performed by Union Pacific under this Section 3. The right to construct said new pipe lines referred to in this Section 3 shall include the right to construct pumps, valves, connections and appurtenances. Section 4. In the event.the District and Union Pacific are able to agree upon the type and nature of the pipelines and -5