Public Utilities Code § 105232

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. The agreements, leases, and equipment trust certificates shall be authorized by resolution of the district and shall contain the covenants, conditions, and provisions deemed necessary or appropriate to insure the payment of the equipment trust certificates from legally available sources of funds specified in the certificates.