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for the purpose of maintaining and renewing the same, but that the District at its sole eost and expense shall be re- ?, ’ ? t qulred to take such steps as are required by sound.engineer­ing practice to prevent damage to or Interruption of service over said railroad facilities by reason of work performed by the District in the maintenance or renewal of said pipe lines* at the request of the union Pacific the District shall, at the expense of Union Pacific, relocate said pipe lines to other locations upon the property of Union Pacific, provided that such relocation would not prevent the use of said pipe lines for the conveyance of water to the areas and facilities then being served by said pipe lines. trlet, effective upon the sale date, license and permission to maintain the pipe lines and pole linea Indicated in broken black and white lines, broken black and red linea and broken black and green lines on said Exhibit "A* pending the removal of said pipe lines and pole lines in the manner and within the periods herein set forth, and while said pipe lines and pole lines remain upon the property of Union Pacific, to use strips'of land seven and one-half (7§) feet in width on each aide of the center line of said pipe lines and pole lines, for access to said lines, for the purpose of enabling the District to maintain or remove the same. The license and permission herein granted shall be subject to the right of Union pacific to construct roads, highways, pipe lines and wire lines over and across said strips and to use its property for any purpose whatsoever which will not unreasonably inter­fere with the use of said pipe lines and power lines by the District during the period during which the District shall have the right to maintain said lines upon the property of Said grants of easements shall also provide that Union Pacific -10