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(4) Temporary removal for repair. A device may be removed for repair or service, provided water use is either discontinued until repair is completed and the device is returned to service, or the service connection is equipped with backflow protection approved by the agency. A retest will be required, prior to return to service, following the repair or service of the device. (5) Temporary removal for replacement. A device may be removed and replaced, provided water use is discontinued until the replacement device is installed. All replacement devices must be approved by the agency prior to being put into service and must be commensurate with the degree of hazard involved. A retest will be required, prior to return to service, following the replacement of the device. (g) Water system survey. (1) Plans and specifications must be submitted to the agency upon request for review of possible cross -connection hazards for new or existing service connections. If it is determined that a device is necessary to protect the public water system, the required device must be installed before service will be provided or continued. (2) The agency may conduct an on -premises inspection or reinspection to evaluate cross -connection hazards. Any customer which cannot or will not allow an on - premises inspection of their piping system shall be required to install the device the agency considers necessary. (h) User supervisor. At each premises where it is necessary in the opinion of the agency, a user supervisor shall be designated by and at the expense of the customer. This user supervisor shall be responsible for the monitoring of the devices and for avoidance of cross -connections. In the event of contamination or pollution of the drinking water system due to a cross -connection on the premises, the agency shall be promptly notified by the user supervisor so that appropriate measures may be taken to overcome the contamination. The customer shall inform the agency of the user supervisor's identity on, as a minimum, an annual basis and whenever a change occurs. (i) Type of protection required. (1) The type of protection that shall be provided to prevent backflow into the approved water supply shall be commensurate with the degree of hazard that exists on the customer's premises. The type of device shall be one of the following: (A) Approved air gap separation (hereinafter "AG"); (B) Approved double check valve assembly (hereinafter "DC"); or (C) Approved reduced pressure principle assembly (hereinafter "RP"). Ordinance No. NS -2921 Page 26 of 57