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 - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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