Cal. Education Code § 48660

(a) The governing board of a school district may establish one or more community day schools for pupils who meet one or more of the conditions described in subdivision (b) of Section 48662. A community day school may serve pupils in any of kindergarten and grades 1 to 6, inclusive, or any of grades 7 to 12, inclusive, or the same or lesser included range of grades as may be found in an individual middle or junior high school operated by the school district. If a school district is organized as a school district that serves kindergarten and grades 1 to 8, inclusive, but no higher grades, the governing board of the school district may establish a community day school for any kindergarten and grades 1 to 8, inclusive, upon a two-thirds vote of the governing board of the school district. It is the intent of the Legislature, that to the extent possible, the governing board of a school district operating a community day school for any of kindergarten and grades 1 to 8, inclusive, separate younger pupils from older pupils within that community day school. (b) The average daily attendance of a community day school shall be determined by dividing the total number of days of attendance in all full school months, by a divisor of 70 in the first period of each fiscal year, by a divisor of 135 in the second period of each fiscal year, and by a divisor of 180 at the annual time of each fiscal year.