Sec. 23-39. Inspection of devices; time limits.
(a) The customer, at the customer's sole expense, shall install and maintain in working order at all times any cross connection control device or booster pump control device required by this article, as amended from time to time.
(b) To ensure that each cross connection control device required by this article is in working order, the customer shall, at the customer's sole expense, have each device inspected or tested by a cross connection control device inspector at the time of construction or installation, and at the following intervals, in the following manner:
(1) Air gaps shall be inspected at intervals not exceeding one year to ensure that they continue to meet the requirements of section 23-38 of this article.
(2) Reduced pressure principle backflow preventers shall be tested at intervals not exceeding six (6) months to ensure that:
a. Both check valves are drip-tight under all pressure differentials; and
b. The pressure differential relief valve will maintain pressure in the center chamber at least two (2) pounds per square inch below that of the inlet chamber.
(3) Double check valve assemblies shall be tested at intervals not exceeding one year to ensure that both check valves are drip-tight under all pressure differentials.
(4) Pressure vacuum breakers shall be tested at intervals not exceeding one year to ensure that the air inlet opens fully when water pressure is at or below atmospheric pressure.
(c) The customer shall permit access to the customer's premises by the utility and/or its inspector, the customer's public water system, at reasonable times, and upon presentation of identification, for inspection of the customer's water system or testing of cross connection control devices installed in accordance with the provisions of this article.
(d) Those customers granted an exemption in accordance with subsection (e) of section 23-35 of this article shall report to the utility any proposed change in process, plumbing, or materials used or stored at the exempted facility at least fourteen (14) days prior to making the change. Failure to do so shall void the exemption.