California Code, Streets and Highways Code - SHC § 5103

(a) The supplying or approval by the public utility, public agency, or mutual water company of plans and specifications for the work or improvement.

(b) The performance of work or service, for an allowance or contribution by the public utility, public agency, or mutual water company toward the cost of the work or service where provided for by its rules or regulations, and for the payment for the work or service.

(c) That the agreement shall become effective upon the effective date of the resolution or ordinance ordering the work in proceedings taken pursuant to this division.

(d) That, after the confirmation of the assessment, the public utility, public agency, or mutual water company shall have exclusive possession, control, and use of the work or improvement as long as the public utility, public agency, or mutual water company uses the work or improvement to render to the lands within the assessment district the services intended to be furnished by the work or improvement.