California’s logging rules and enforcement are too weak, allowing excessive tree cutting that leads to mudslides, damaged water supplies, and endangered fish and wildlife, according to a study released yesterday by a U.S. Forest Service geologist. Meanwhile, as part of a 50-year habitat conservation plan, Seattle Mayor Paul Schell (D) yesterday proposed that logging be banned in the city-owned 90,546-acre watershed that is the primary water source for the Seattle region. The mayor’s plan, which needs to be approved by the City Council and the feds, would also implement other fish protection measures while shielding the city from potentially more stringent and costly restrictions under the Endangered Species Act.