Cal. Education Code § 35724

If plans and recommendations adopted by a county committee propose changes in the boundaries or status of school districts under the jurisdiction of the superintendent of any adjacent county, the county committee of each such adjacent county shall be requested in writing to concur in the plans and recommendations. If the county committee of an adjacent county concurs in the plans and recommendations, the concurrence shall accompany the recommendations transmitted to the State Board of Education. If the county committee of an adjacent county fails to respond to the request for concurrence within 90 days of the date of the request, such failure shall be deemed to be a concurrence in the plans and recommendations. If a county committee of an adjacent county does not concur in the plans and recommendations, it shall so notify the other county committee in writing and accompany the notification with plans and recommendations for the reorganization of school districts of its county including territory that would be affected by the plans and recommendations of the other county committee. After 60 days from the notification of nonconcurrence, if the county committees are still unable to agree upon plans and recommendations for reorganization of the territory, the county committees, or any of them, may submit plans and recommendations to the State Board of Education, and the board may approve or reject the plans, or any of them, in the same manner as other plans and recommendations.