Cal. Pub. Util. Code § 102552

The agreements and leases shall be duly acknowledged before a person authorized by law to take acknowledgments of deeds and in the form required for acknowledgment of deeds, and such agreements, leases, and equipment trust certificates shall be authorized by resolution of the district and shall contain such covenants, conditions, and provisions which may be deemed necessary or appropriate to insure the payment of the equipment trust certificates from legally available sources or sources of funds specified in such certificates.