The difference in the constructions is between passive constructions of simple present and present progressive. Situate is not generally used with present progressive. The factory is situated (is being situated) ten miles away from this town. Anyway give us the context to give you more information.
Generally speaking, "Being + past participle" is a construction used to describe passive actions of immediacy. This German Shapherd is being trained for police patrol. - This means, the training is still in process, not finished yet. This German Shapherd is trained for police patrol. This says, the trained is completed and the it is ready for duty. Your car