A Los Angeles Superior Court judge has given the go-ahead for a Saugus subdivision that environmental groups had tried to block. The Center for Biological Diversity, Sierra Club, California Water Impact Network and Friends of the Santa Clarita River had challenged the Santa Clarita City Council’s approval of River Village, a 1,089-home division planned by The Newhall Land and Farming Co. north of the Santa Clarita River. They said the developer’s Environmental Impact Report was not thorough enough and did address the project’s possible impact on the river and native plants and animal species. Judge Dzintra Janavs disagreed and sided with the city, clearing the way for construction to start.