Two separate grass fires broke out in Marshall and Nicasio over Labor Day weekend. At around midnight Sunday morning, fire crews fought a 10-acre blaze in Nicasio that flared up after a super-charged electrical line experienced an intense power surge—what PG&E calls a “fire ball.” Though a connection was not confirmed, there was also a brief power outage at that time for West Marin residents. The fire was contained in an hour, though a battalion chief suffered injuries caused by a vehicle accident. He was treated and released from Marin General Hospital. On Monday morning, a quarter-acre vegetation fire was reported at the 8000 block of Marshall-Petaluma Road in Marshall, at the old Grossi Ranch. It spread into nearby brush on the S2 ranch and grew to 13 acres before a helicopter and air tankers from Sonoma doused the flames in the afternoon. The cause of that fire is still under investigation.