| 31. | He built off-street filling stations with underground tanks for the gasoline and electric pumps to dispense it.
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| 32. | Underground tanks became such a problem because for decades, they were made of steel, which corrodes easily.
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| 33. | Water is heavier than gasoline and normally settles to the bottom of the filling station's underground tanks.
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| 34. | Gas stations had no way to pump gasoline from underground tanks and restaurants couldn't even heat coffee.
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| 35. | The trouble is that MTBE is water-soluble, so leaks from underground tanks can spread through water supplies.
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| 36. | My personal favorite gas station is permanently closed, because of environmental regulations having to do with underground tanks.
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| 37. | Possible sources include such disparate sources as wood-burning stoves, residual discharge of old underground tanks and vehicle emissions.
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| 38. | Creating hydrogen from methanol has advantages because methanol can be stored in underground tanks at existing gasoline stations.
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| 39. | Even an underground tank can float.
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| 40. | The most significant challenge at Hanford is stabilizing the of high-level radioactive waste stored in 177 underground tanks.
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