California Code, Health and Safety Code - HSC § 9071

(a) In its annual budget, the board of trustees may establish one or more restricted reserves. When the board of trustees establishes a restricted reserve, it shall declare the exclusive purposes for which the funds in the reserve may be spent. The funds in the restricted reserve shall be spent only for the exclusive purposes for which the board of trustees established the restricted reserve. The reserves shall be maintained according to generally accepted principles.

(b) Any time after the establishment of a restricted reserve, the board of trustees may transfer any funds to that restricted reserve.

(c) If the board of trustees finds that the funds in a restricted reserve are no longer required for the purpose for which the restricted reserve was established, the board of trustees may, by a four-fifths vote of the total membership of the board of trustees, discontinue the restricted reserve or transfer the funds that are no longer required from the restricted reserve to the district's general fund.