NR 810.14(2)(a)(a) Drain down inspections. Drain down inspections include completely draining the tank. Rigging and ladders may be necessary to access all surfaces. The tank shall be cleaned of all sediment prior to inspecting. Unless an alternative schedule is approved by the department, a drain down inspection shall be utilized a minimum of every ten years or every other inspection.

NR 810.14(2)(a)1.1. Following all drain down inspections and painting, the interior of the tank shall be disinfected in accordance with one of the methods in AWWA Standard C652-02. A minimum of 2 successive safe samples, taken at 24-hour intervals, shall be obtained which indicate bacteriologically safe water; or one safe sample shall be obtained only if a free chlorine residual of at least 0.1 mg/l is remaining when the results of the safe sample are reported.

NR 810.14(2)(a)2.2. For all concrete ground reservoirs with cracks or signs of leakage, the top shall be soaked with water and the interior shall be checked for leaks.

NR 810.14(2)(b)(b) Float down or partial drain inspections. Float down inspections involve the use of a disinfected inflatable raft and allow access to all levels of the tank. The water level shall be lowered below the normal low operating level to expose the sidewalls of the tank. If the tank is to remain in service during the inspection or the water will be sent to the distribution system following the inspection, all of the following requirements apply:

NR 810.14(2)(b)3.3. For all concrete ground reservoirs with cracks or signs of leakage, the top shall be soaked with water and the interior shall be checked for leaks.

NR 810.14(2)(b)4.4. A minimum of 2 bacteriologically safe samples shall be obtained from the tank after the inspection, one following the inspection and one 24 hours later.

NR 810.14(2)(c)(c) Diver inspections. Diver inspections shall involve the use of a commercial diver tethered to, and in communication with, the outside. Procedures shall be done in accordance with Section 4.4 of AWWA Standard C652-02 and Section 12.0 of the Consensus Standards for Commercial Diving and Underwater Inspection. The department recommends that the tank be removed from service during the inspection. If the tank is to remain in service during the inspection or if the water will be sent to the distribution system following the inspection, all of the following requirements apply:

NR 810.14(2)(c)2.2. All equipment shall be dedicated for potable water use and shall be disinfected with a 200 ppm chlorine solution. The inspector shall also be disinfected.

NR 810.14(2)(c)3.3. The inspection of the tank shall be done after the sediment is removed from the bottom of tank and shall include a visual inspection of any expansion joints.

NR 810.14(2)(c)4.4. For all concrete ground reservoirs with cracks or signs of leakage, the top shall be soaked with water and the interior shall be checked for leaks.

NR 810.14(2)(c)5.5. A minimum of 2 bacteriologically safe samples shall be obtained from the tank after the inspection, one following the inspection and one 24 hours later.

NR 810.14(2)(d)(d) Robotic inspections. Robotic inspections shall involve a rover unit with a fiber optic tether and video camera and shall include cleaning capabilities. If the tank is to remain in service during the inspection or if the water will be sent to the distribution system following the inspection, all of the following requirements apply:

NR 810.14(2)(d)3.3. For all concrete ground reservoirs with cracks or signs of leakage, the top shall be soaked with water and the interior shall be checked for leaks.

NR 810.14(2)(d)4.4. A minimum of 2 bacteriologically safe samples shall be obtained from the tank after the inspection, one immediately following the inspection and one 24 hours later.

NR 810.14(3)(3) Department notification. The department’s regional drinking water staff person shall be given 48 hours prior notice of the date and time of the inspection.

NR 810.14(4)(4) Inspection report submittal. Upon completion of the water storage facility inspection, a completed department report form shall be submitted to the department’s regional drinking water staff person documenting the condition of the storage facility. The water supplier shall submit copies of any additional reports and videos prepared by the inspector.

NR 810.14(5)(5) Manhole cover gasket. Following all inspections and maintenance, the integrity of the gasket between the access manhole cover and curbing shall be checked and replaced if necessary to prevent the entrance of dust and insects. If no gasket is present, one meeting s. NR 811.64 (7) requirements shall be provided to prevent the entrance of dust and insects.

NR 810.15NR 810.15 Cross connections and interconnections. Unprotected cross-connections are prohibited. Cross-connections shall be protected as required in s. SPS 382.41. Water system interconnections are prohibited except as provided in sub. (2). In addition the following requirements shall be met:

NR 810.15(1)(1) Cross connection control program. In order to protect the public water supply system, the water supplier for every municipal water system shall develop and implement a comprehensive cross connection control program for the elimination of all existing unprotected cross-connections and prevention of all future un-protected cross connections to the last flowing tap or end-use device. The program may include providing public education materials in lieu of inspections of low hazard portions of residential or commercial facilities. Low hazard areas consist of normal kitchen and bathroom fixtures. The water supplier shall keep a current record of the cross connection control program available for annual review by the department. The cross connection control program shall include:

NR 810.15(1)(a)(a) A complete description of the program and the administration procedures, including designation of the inspection or enforcement agency or agencies.