The RAL mound puzzle Mystery Cache
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Difficulty:
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Terrain:
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Size: 
(small)
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A big mound that can be walked up at work.
In my job I see a few compounds and gases as have to change gas bottles the equipment and experiments in the labs use. Have seen most of these. antimony selenium hydrogen - hydroden beryllium hydrogen - hydrogen and hydrogen argon carbon lithium and carbon
Make sure it is left out of sight and say when log paper is getting low. At the moment car can get 45m or so to cache but for how long for who knows, say if no good, makes sense when there.
Can use this geochecker as well
(visit link)
Additional Hints
(Decrypt)
Hc sebz znva ebnq ubhfrf vf gur yrsg fvqr oruvaq ovt gerr ng tebhaq yriry