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t <br /> valve in the lateral pipe run is of the type used in water mains. <br /> A key or wrench is necessary to open or close the valve . One had <br /> to be obtained at maintenance . Once the key was obtained, the <br /> valve was closed approximately 3/4 of a turn . The riser was <br /> again filled with water , to the same level as the flange . The <br /> water level was monitored for over an hour . No change in level <br /> was observed. <br /> CONCLUSION: The overflow pipe system teeing off of the level <br /> sensor riser was leaking through the valve . Once the valve was <br /> closed, the leak stopped. This is thought to be a second leak <br /> which was not seen when the tank was tested last week . The <br /> reason for this thinking is based on the level of testing. The <br /> tank test last week was conducted at a level not exceeding 4.5 <br /> 0 . <br /> The level sensor riser pipe was inspected and measured. The <br /> water level in the riser would have to be higher than 9° to flow <br /> into the overflow pipe . <br /> REC ENDATION: Additional testing. Helium test of the tank <br /> system should be the next step . <br />