10% is the Chevron Standard.
General standard is 15% a few places may have 10% as mentioned olsen bros, as well as redland and y mart in molalla have ethanol free, highly recommended for small engines (boats, bikes, mowers, etc) to avoid costly carb repairs, otherwise I'm a firm believer chevron gas is far better than other big chains. Also all pre 2005ish vehicle owners don't forget to change your fuel filter! Odot upped the interval to once a yr or 15k, newer vehicles tend not to have a serviceable filter and can handle the ethanol better, though still benefit from cleanings
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