Notwithstanding the provisions of Section 87815, the governing board of a community college district may adopt an alternative method of computing the salary received by an academic employee who serves less than a full school year.

The alternative method shall include the deduction from the employee’s regular salary of only that amount actually paid to a substitute or, if a substitute is not employed, the amount which would have been paid to a substitute had a substitute been employed.

For the purposes of this section, the amount which would have been paid to a substitute is that amount established by the district in a published salary schedule for substitute employees.

The alternative method shall only be applied upon authorization by the community college board based upon individual employee application and shall be limited to no more than five days per school year for each employee.