Katie Hernandez said she heard the boat speeding into the harbor, and she was shocked at what she saw when she came outside.
She said she saw a dark-colored wakeboard boat inside the small harbor area near the Discovery Bay Marina docks chasing after a person on a jet ski. They were going around in circles, creating waves and wakes which rocked the boats at nearby docks.
As the boat driver rushed to turn around and leave, the boat crashed into the boats on the opposite side of the dock, video shows.
She said she lived in the area since she was a little, and recently, she said she has noticed a lot more problems on the water, especially with those who don't live in Discovery Bay but instead bring their boats in and launch them from the nearby marinas.
The Contra Costa Fire Department said one person was taken to the hospital with minor injuries. Katie said she's amazed no one was seriously hurt.
Now, she's questioning whether people are safe in their own backyard, the area right off the end of their docks.
The Contra Costa Sheriff's Department said the case is still under investigation, but so far they haven't made any arrests in the case.
Friends of the jet skier said he's pretty shaken up and banged up after the accident, but is expected to be OK.
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