| 11. | Walden Pond is a perfect glacial " kettle, " fed by underground spring and rainwater.
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| 12. | The cause was thought to be underground springs released during the pile driving and excavations.
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| 13. | When digging the foundation, excavators discovered an underground spring.
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| 14. | It is nicknamed " the city of waters ", because of its abundant underground springs.
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| 15. | The lake salinity increases towards the middle and northern parts due to underground spring waters.
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| 16. | It may also be found near underground springs.
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| 17. | It continued until the 1960s when small underground springs made the extraction too expensive to continue.
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| 18. | "When they were moving dirt to build what's now turn 11, they found an underground spring,"
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| 19. | The source of much of the water comes from cold underground springs rising from a bedrock aquifer.
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| 20. | Upon return all that was there was pools fed by an underground spring but no vigorous water.
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