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(3) Tri-water system or circulated closed-loop systems, such as a combination fireline, heating and cooling system, are prohibited. (4) Full-flow testing or assembly tear-down requirements for firelines. Backflow prevention assemblies installed on firelines must either be full-flow tested at least once each five years, or must be completely torn down and rebuilt at least once each five years if full-flow testing cannot be accomplished. The assembly must be cleaned and all rubber parts replaced when deemed necessary by the certified tester or the assembly manufacturer. Assemblies must be tagged by the tester to indicate the tear-down date. If within a five year period, an assembly is torn-down, a new five year tear-down period will begin at that time. If a backflow prevention assembly is found to be malfunctioning in an annual testing process, the assembly must be completely torn-down and rebuilt at that time. The director will track individual assemblies to ensure compliance with these requirements. (5) Test and maintenance report form for fireline backflow prevention assemblies. Test and maintenance report forms used by fireline testers must include a confirmation that the system has been placed back in operation upon completion of a test. Additionally, these forms must include an indication by the tester of whether a flow test was performed on an assembly within the previous 12 months as established in NFP A 25 Section 9.6.2.2. The tester will attach full-flow documentation to the form when submitted to the director. (6) Single check valve. The single check valve is not considered to be an approved assembly, and will be used only in limited instances such as for directional flow control. Sec. 86.593-86.599. Reserved. DIVISION 4. PROCEDURES. Sec. 86.600. In general. (a) The procedures outlined in this division are based on the principle of containment of all actual and potential contamination hazards within the customer's system. (b) A customer may request approval from the director for a proposed deviation from or exception to the standards in this article. The director may approve a deviation or exception only if it does not involve a significant risk of increased contamination to the city water system. (c) If a customer refuses to allow access to water and wastewater department representatives for an inspection or a water use survey, the director may either refuse or discontinue the customer's water service, or assume that a high contamination hazard exists, and therefore require the highest degree of protection on the customer's system. Sec. 86.601. New facilities. (a) All new facilities are required to comply with the requirements of this article. Compliance by a new city water system customer with the requirements for installation of one or more backflow prevention assemblies will be verified in conjunction with the customer's application for water service, or with the customer's building and plumbing permits. (b) The director may require field inspection of the customer's premises, in addition to plan submittal and review, to determine the actual or potential hazards and backflow prevention assembly requirements. (c) All mechanical layouts or building plans submitted to the building inspections division will be reviewed to assure compliance with the requirements of this article and the plumbing code. All 11 C:\TEMP\backflow.doc