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Roddy Ranch is a 2,000-acre ranch in southern Antioch and includes rolling grasslands that were thought to host the San Joaquin kit fox. The fox is known from the southernmost parts of the San Joaquin County but in the past had been observed as far north as north-central Contra Costa County. Using recent research, environmental data on prey conditions, and ecological analyses of predator relationships, Zentner Planning and Ecology demonstrated that the kit fox was not likely to occur at Roddy Ranch or its environs. We then incorporated thus information into the biotic section of the EIR documents and a resource management plan for the project open space adjacent.