Woodacre resident Ashley Sanderson was arrested at Stinson Beach last Sunday after allegedly pulling down his Speedo thong, mooning people and rubbing himself, according to Marin County Sheriffs Sergeant Brian Fay. Deputies found Mr. Sanderson in the water and arrested him after he returned to land, charging him with indecent exposure, nudity in a public place and soliciting another to engage in lewd conduct. A misdemeanor arraignment is tentatively set for July 20 at Marin Superior Court.