These two areas (which SunRich refers to as "bunkers") are enclosed by concrete barricades. For the most part, these bunkers are used to store grain trucks and various pieces of farming machinary (which I assume is rented out to their customers). The larger of the two is also occasionally used to store genetically modified / non-food grain (such as corn destined for ethanol processing). Usually said grain is covered with tarp and tile to protect it from the elements, but sometimes not (as pictured below).
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