NR 811.64(10)(e)1.1. In addition to meeting the requirements of s. NR 811.63 (6), the top of any earth covered reservoir shall be covered with a flexible waterproof membrane. The minimum membrane thickness shall be 0.060 inches. Department approval of the specific membrane proposed is required. Protective boards shall be placed over the membrane before applying the earth cover when recommended by the membrane manufacturer. NR 811.64(10)(e)2.2. Bentonite panel membranes may not be used to meet the waterproof membrane requirement. NR 811.64(10)(f)(f) Roof slope. The top of any storage structure shall have a minimum slope of 0.015 feet per foot to facilitate drainage. NR 811.64(10)(g)(g) Drainage for roof or cover. The roof or cover of the storage structure shall be well drained, but downspout pipes may not enter or pass through the reservoir. Where parapets or similar construction which would hold water and snow on the roof are constructed, adequate waterproofing and drainage shall be provided. NR 811.64(10)(h)(h) Exposed grouted precast concrete planked roofs. Grouted precast concrete planked roofs exposed to the environment shall meet the following requirements: NR 811.64(10)(h)1.1. A minimum 2 inch thick reinforced concrete topping shall be installed over the top surface of the grouted plank roof. Fiber mesh may be used to provide reinforcing. 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)(11) Safety. Worker safety shall be considered in the design of the storage structure. The following shall apply: 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(12)(12) Freezing. All of the following actions shall be taken to minimize the potential for freezing: 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)(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)(15) Painting and cathodic protection. Interior paints, coatings, and cathodic protection systems shall be installed in accordance with all of the following requirements: 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 NoteNote: A copy of the cited AWWA standards is available from the American Water Works Association, 6666 West Quincy Ave., Denver, Colorado 80235.