A petition by the Salmon Protection and Watershed Network (SPAWN) requesting that Marin County rewrite an Environmental Impact Report (EIR) on coho salmon and steelhead trout habitat in the San Geronimo Valley was denied this week by a Marin County Superior Court judge. In her final ruling, Judge Lynn Duryee found that the existing EIR, prepared as part of the county’s 2007 Countywide Plan update, was sufficient in scope its conclusions supported by substantial evidence.…