82 groundwaters in this region have been there for several thousand years. Part D Question 17 If a Plowshare explosive is detonated at a depth which takes it very nearly down to sea level, would the contaminated water from the cavity have to migrate all the way to the sea before it could possibly surface? Or are there geological conditions under which it might rise, and surface at elevations above the detonation level? Part D Answer Question 17 There are geological and hydrological conditions under which ground water occurring at depths of about sea level might move to points of discharge at the land surface. Such conditions could occur if the water bearing formation were so inclined or tilted that it outcropped at the surface and at the same time the water pressure in the formation was lower at the outcrop than at its sea level location. Such factors are investigated and evaluated during review of site hydrology for any proposed Plowshare application. Part E Question 17 Is it correct to conclude that nuclides like tritium and krypton-85, which contaminate the natural gas from the GASBUGGY experiment, eventually will end up in the air no matter what we do? Is it true that our only choice once we create them, is to flare them into the atmosphere by burning gas at the detonation site, or--after selling contaminated gas and oill--to burn them into the air in our industrial centers, in our automobiles, or in our furnaces. . ‘Part EAnswer Question 17 fo a degree one can correctly conclude that tritium and krypton-85 which contaminate the gas of a Plowshare natural gas stimulation program will end up in the air. However, the levels of gaseous radionuclides which have been or will be released are weil below the accepted guidelines governing