A Santa Rosa gang member has been sentenced to eight years in prison for an assault at the Sonoma County Fair last summer. David Jesse Tapia, 19, pleaded no contest in October to assault with a deadly weapon and admitted being a member of a street gang. He was sentenced on the charges Wednesday. Tapia and Marquis Anthony Gonsalves, 20, of Santa Rosa, were charged with punching and kicking two brothers in the carnival area of the fair on Aug. 6. The brothers then left the fair and separated. Tapia, Gonsalves and a 14-year-old boy attacked one of the brothers who was hit with a rock and stabbed in the neck, District Attorney Stephan Passalacqua said. Gonsalves pleaded guilty in October to assault with a deadly weapon and being a street gang member. He was sentenced to three years probation and nine months in the Sonoma County jail. The district attorney’s office dismissed four other assault charges against each of the two defendants as part of their plea agreement.