i would assume a combo of methane and whatever other gasses get trapped in the tank, although thats a guess. i have never delt with on farm confined spaces only through my job and i was always kinda nervous going down below street level and always took way too much time to ventilate and purge and always kept my gas meter close by. they had a double fatality in a manhole years b4 i started working at that job and any manhole work was atleast a 2 person operation until recently b4 i left, now they say its ok to go into a confined space with 1 person, thats just asking for trouble imo atleast with 2 people 1 person can call 911 if theres an emergency, while if your alone and something happens it may be awhile b4 someone notices your missing.
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Today's Featured Article - Farmall 460: That's My Girl - by LeAnn R. Ralph. How many sounds can you think of that are as familiar to you as your own breathing? What about the hum of your refrigerator? Or the thump of your clothes dryer? Maybe the engine of your car? You hear those sounds every day, and you don't think much about them, do you. I can think of a few common, ordinary sounds in my daily life, too.
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