Education Code § 37710
CHAPTER 6. Four-Day School Week
If a school operating on a four-day school week pursuant to Section 37710.3, 37710.5, 37711, or 37712 fails to achieve its Academic Performance Index growth target pursuant to Section 52052, the authority of that school to operate on a four-day school week shall be permanently revoked commencing with the beginning of the following school year.