I grew up in that area and will be returning to our ranch in Elk Grove in a couple of weeks for some remodeling work.
Aerojet tests the big rocket and hyperspeed engines for the space and specialized military programs over there along US-50 between Rancho Cordova and Folsom, and you can hear the 'boom' for a long ways up and down the valley when they do it. Our place is about 15 miles from there and it is very loud when they test the engines which can go from a quick 'boom' to a longer 'rumbling roar' which can last for a minute or more.
The CAANG flies the F-16 and they maneuver up and down the state in their air interceptor role all the time, sometimes breaking the sound barrier when doing so.
There is also a lot of heavy road construction going on right now to improve US-50 heading up the mountain through Placerville just to the East of El Dorado Hills, and they sometimes need to do blasting to break up the large granite formations encountered in that portion of the foothills.
Must've been a slow news day for the local news network.
Richard 
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“Sometimes the Bible in the hand of one man is worse than a whisky bottle in the hand of (another)… There are just some kind of men who – who’re so busy worrying about the next world they’ve never learned to live in this one, and you can look down the street and see the results.” - To Kill A Mockingbird (Atticus Finch)
“Almost any sect, cult, or religion will legislate its creed into law if it acquires the political power to do so.” - Robert Heinlein
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