(a) When a Class A condition is discovered, the operator shall lock off the gas supply at the meter, unless the affected piping or gas-fired appliance can be effectively isolated and secured from the rest of the system, and issue a warning tag.

1. (1) If the operator is not advised by the customer within 10 calendar days that the condition has been corrected and service is ready to be reinstituted, the operator shall contact the customer no later than the end of the first business day after the 10-day period to determine the status of service.

(d) Whenever a warning tag is issued, regardless of the class of the condition, the operator shall attempt to notify the customer and obtain a signature acknowledging receipt of such notice.

1. (1) In apartment buildings, the operator shall notify the property owner or agent (such as superintendent, custodian or maintenance worker) of the condition and state the corrections that are required.
2. (2) If the operator can not obtain a signature, an additional notice shall be provided to the customer stating that a notice of hazardous condition tag has been issued and the corrective actions that are required.