A petty cash fund is authorized to be established in the amount determined by the utility authority with recommendations from Yurok Public Utility District staff. This fund may be used to pay small expenses, when necessary, and to pay small obligations when it is not feasible to pay by check on the official depository. The fund may be reimbursed periodically from the official depository of the Yurok Public Utility District in the amount of and upon the submittal of receipts, vouchers, and statements signed by the payees of their proof of expenditure. The treasurer shall certify petty cash reimbursement vouchers. Petty cash shall be maintained in a locked safe.