(1) (b):

RCW 46.61.522
Vehicular assault—Penalty.
(1) A person is guilty of vehicular assault if he or she operates or drives any vehicle:
(a) In a reckless manner and causes substantial bodily harm to another; or
(b) While under the influence of intoxicating liquor or any drug, as defined by RCW 46.61.502, and causes substantial bodily harm to another; or
(c) With disregard for the safety of others and causes substantial bodily harm to another.
(2) Vehicular assault is a class B felony punishable under chapter 9A.20 RCW.
(3) As used in this section, "substantial bodily harm" has the same meaning as in RCW 9A.04.110.

Also per http://komonews.com/news/local/motorcyclist-struck-seriously-injured-by-suspected-dui-driver-on-whidbey-is
The driver of the Jeep, a 59-year-old Freeland woman, was not injured but showed signs of intoxication, the State Patrol reports. She was booked into the Island County Jail for investigation of DUI and vehicular assault.