NR 811.64(10)(h)2.2. A minimum 0.060 inch thick flexible waterproofing membrane shall be installed over the concrete topping. Department approval of the specific membrane proposed is required. The installation of stone ballast over the membrane is optional.

NR 811.64(10)(h)3.3. The roof planks, concrete topping, or any insulation boards installed over the topping shall be installed to provide the minimum slope of 0.015 feet per foot required in par. (f).

NR 811.64(10)(i)(i) Exposed reinforced poured-in-place flat concrete roofs. Reinforced poured-in-place flat concrete roofs exposed to the environment shall be provided with a minimum roof slope of 0.015 feet per foot to facilitate drainage and a minimum 0.060 inch thick flexible waterproofing membrane installed over the roof. Department approval of the specific membrane proposed is required. The installation of stone ballast over the membrane is optional.

NR 811.64(11)(a)(a) Ladders, ladder cages or safety climbing devices, balcony railings, landing platforms, guardrails, and safe locations of entrance hatches shall be provided where applicable.

NR 811.64(11)(b)(b) On elevated tanks where persons transfer from the access tube to the water compartment railings, handholds and landing platforms shall be provided, where applicable.

NR 811.64(11)(c)(c) On elevated tanks with riser pipes over 8 inches in diameter, protective bars shall be installed over the riser openings inside the tank.

NR 811.64(11)(d)(d) A handrail system shall be installed on the roof of any elevated tank.

NR 811.64(11)(e)(e) Storage structures shall be constructed to meet applicable local, state, including applicable portions of ch. SPS 332, and federal OSHA codes for specific safety requirements.

NR 811.64(11)(f)(f) Confined space entry should be in accordance with the requirements of s. SPS 332.29 and federal OSHA codes.

NR 811.64(12)(a)(a) All water storage structures and their appurtenances, especially riser pipes, overflows, and vents shall be designed to minimize freezing that would interfere with proper operation.

NR 811.64(12)(b)(b) Riser pipes shall be insulated where possible.

NR 811.64(12)(c)(c) Recirculation pumps and air bubbler systems may be used to minimize freezing.

NR 811.64(12)(d)(d) Equipment used for freeze protection that will come into contact with the potable water shall meet ANSI/NSF Standard 61 or be approved by the department.

NR 811.64(13)(13) Turnover. Storage facilities shall be designed to facilitate turnover of water in order to prevent freezing and stagnant water conditions. Consideration shall be given to installing separate inlet and outlet pipes, diffusers, baffle walls, adjusting controls to temporarily reduce storage capacities, or other department approved means where necessary.

NR 811.64(14)(14) Internal catwalk. Every catwalk over a storage structure containing finished water or water to become finished water shall have a solid floor with sealed raised edges to prevent shoe scrapings, dirt, and other contaminants from falling into the water.

NR 811.64(15)(a)(a) Metal surfaces shall be protected by paints or other protective coatings. The paints or coatings may be accompanied by cathodic protection devices.

NR 811.64(15)(b)(b) Interior paint and coating systems and application procedures shall be consistent with AWWA standard D102 in effect at the time of application, have ANSI/NSF Standard 61 approval for use in potable water, and be approved by the department in accordance with s. NR 810.09 (5). Paint and coating systems shall be applied, cured, and used in a manner consistent with the ANSI/NSF approval. After curing, the paint or coating shall not transfer any substance to the water that will be toxic or cause taste or odor problems.

NR 811.64(15)(c)(c) Cathodic protection shall be designed and installed by competent technical personnel.

NR 811.64(16)(a)(a) Smooth-end sampling faucet. A smooth-end sampling faucet shall be installed in the connecting main or riser pipes of elevated tanks, standpipes, and reservoirs, if design permits. The sampling faucet shall be installed in accordance with the requirements of s. NR 811.37 (5) (b) 3.

NR 811.64(16)(c)(c) Valve vaults and above grade enclosures. Valve vaults and above grade enclosures installed at the base of storage facilities shall be protected against freezing and provided with floor drainage. Floor drains may be connected to a sanitary sewer, when available, if the floor elevation is at least one foot above the rim elevation of the nearest upstream sanitary sewer manhole. If a sanitary sewer is available but a manhole is not located nearby or the manhole does not comply with the upstream location or the one-foot requirement, the department may require installation of an additional manhole on the sanitary sewer main or on the sanitary building sewer. The facility may discharge to the ground surface by gravity, if possible, or else by a floor sump with a sump pump permanently installed. If constructed outside of the storage facility, the entrance to the vault or enclosure shall be locked to prevent unauthorized access.

NR 811.64(16)(d)(d) Condensate platform drains. Condensate platform drains shall not be directly connected to the overflow piping. The condensate platform drain shall be a minimum 2-inch diameter pipe and shall be brought down to within 12 to 24 inches of the ground surface and discharge downward facing with a free air break over a drainage inlet structure, splash pad, or riprap.

NR 811.64(17)(a)(a) Disinfection required. Water storage structures shall be disinfected before being put into service or before being returned to service following maintenance or repair work to the water storage structure. Detailed procedures for disinfection, equivalent to those outlined in AWWA standard C652 in effect at the time of disinfection, shall be written into the specifications by the design engineer or contractor as applicable.