California Code, Public Resources Code - PRC § 5090.41

(a) The division shall designate and set aside 280 acres for nature study, which shall be closed to the operation of off-highway motor vehicles. The division shall, in carrying out this subdivision, protect the natural and cultural values of the designated lands by taking appropriate measures, which may include the erection of physical barriers to off-highway vehicle use.

(b) The division shall identify approximately 395 acres as a “Buffer Zone” on the Record of Survey filed by the State of California with the County Recorder of San Benito County, California, on April 2, 1990, in the Book of Maps, Number 10, Page Number 79, plus the three southernmost areas, consisting of approximately 196 acres identified on Figure I-2, Page 5, Appendix, Environmental Impact Report for Acquisition of Additional Land at Hollister Hills SVRA, State Clearinghouse Number 88051716, which shall be closed to the operation of off-highway motor vehicles.