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Section 38-181. Backflow protection where minimum air gap cannot be provided. Devices to protect against backpressure and backsiphonage shall be installed at all fixtures and equipment where backflow may occur and where a minimum air gap cannot be provided between the water outlet to the fixture or equipment and its flood-level rim. For connections not subject to backpressure, a vacuum breaker shall be installed on the discharge side of the last valve on the line serving the fixture or equipment. For connections subject to backpressure, an approved backflow preventer shall be installed on the line serving the fixture or equipment. 10. That Section 38-185(a) of the Code of the City of Portsmouth, Virginia, 1988, be amended to read as follows: Section 38-185. Responsibility of owner as to inspection, testing, repair, etc., of backflow prevention devices. (a) The owner of any premises where backflow prevention devices are installed shall have such devices inspected and tested at time of installation and annually thereafter. Inspection and testing shall be accomplished by backflow prevention device testers certified by the director. The date of annual testing shall be within thirty (30) days before or thirty (30) days after the anniversary date of installation. If the director concludes that more frequent inspections are required, the director shall notify the owner of the premises in writing of such finding and shall further specify the basis for such conclusions. The director shall also promulgate a schedule for more frequent inspections. 11. That Section 38-186(c) of the Code of the City of Portsmouth, Virginia, 1988, be amended to read as follows: Section 38-186. Certification of prevention device testers. (c) A certificate issued under this section shall be valid for one (1) year from the date of issuance, unless sooner revoked. The holder of the certificate shall renew it annually. Such renewal certificate shall be granted upon written application, showing the holder's purposes and conditions remain unchanged, unless it is made to appear, by affidavit filed with the director, that the applicant is no longer competent or entitled to such renewal certificate, in which event, the renewal certificate shall not be granted until the applicant has undergone the examination required by this section. If any such certificate is not renewed for a period of six (6) months after the expiration date, the holder to whom such certificate was issued shall not be permitted to again engage in such occupation, nor shall a certificate be issued to