PETALUMA, CALIF. (August 1, 2021) – Shawn Arriaga of Antioch became the latest to visit Western Midget Racing presented by Masters Design and Construction victory lane, scoring Saturday’s race at Petaluma Speedway. The 2007 Petaluma Speedway champion fended off early challenges from Brentwood’s Blake Bower then charged ahead for the win. Bower and Arriaga split…