Cal. Educ. Code § 16068

If any school district receives a final apportionment under this chapter and after November 12, 1952, receives money from the federal government as reimbursement for any expenditures by the state or school district for constructing any school facilities included in the construction project for which the district is receiving an apportionment, the amount of the district’s annual repayment next succeeding the date on which the district receives the money shall be increased by the amount of the money so received; provided, however, that the annual repayment of the district shall not be so increased where the money received from the federal government constitutes a contribution toward the cost of school facilities which are to be acquired, in part, with an apportionment, and the federal funds are encumbered or expended by the district in accordance with the purposes of the apportionment.