Design Guide for Community Water Systems - The Water, Sanitation ...

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a. Overflows shall be sized to permit the waste of water in excess of themaximum filling rate with a head not more than six inches above the lip ofthe overflow. Resistance of flow through the screen or flap shall beconsidered in sizing the overflow;b. Overflows shall be brought down to an elevation between 12 and 24inches above the ground surface, shall terminate at the bottom with anelbow directed away from the foundation, and shall discharge over adrainage inlet structure or splash plate. Overflows shall not be directlyconnected to a sewer or storm drain;c. Overflows shall be protected from entrance of birds or animals by a tightfitting counterweighted flap valve. Overflows should be diverted tominimize property damage and inconvenience to adjacent propertyowners; andd. Overflows shall be provided for all clearwells.7.0.8. Freeze Protection for Unpressurized Finished Water Storage StructuresAll unpressurized finished water storage structures and their appurtenancesincluding the internal structural components riser pipes, overflows, vents, andhatches shall be designed to prevent freezing that will interfere with properfunctioning or cause structural damage to the storage vessel. Design shall bebased on a 100 year return frequency extended low temperature period andaverage wind velocity.7.0.9. CatwalksEvery catwalk over finished water in a storage structure shall have a solidfloor with raised edges so designed that shoe scrapings and dirt will not fallinto the water.7.0.10. Corrosion ProtectionProper protection shall be given to metal surfaces. Tanks constructed of steel,wrought iron, or other metals subjects to corrosion shall have both interior andexterior surfaces painted, except that bottoms of reservoirs and standpipesshould not be painted.a. Exterior paint should contain less than 100 milligrams of lead perkilogram of dried paint to prevent removed paint from beingclassified as a hazardous waste.b. Exterior paint color should be chosen to help manage thetemperature of stored water to reduce freezing or reduce excessivesummer temperatures as needed.c. Interior paint systems shall be certified for drinking water use underthe latest ANSI/NSF Standard 61.d. Interior paint systems shall be properly applied and cured and shallnot transfer any substance to the water that results in a violation of amaximum contaminant level or secondary contaminant level outlinedAug. 29, 2003Page 136
in 10 CSR 60, Chapter 4. Curing should also be done to eliminatetastes and odors. After painting and proper curing are completed andthe tank is filled, the water that exhibits such odors shall be tested foreach paint constituent that is listed in 10 CSR 60, Chapter 4 prior toplacing the tank in service.e. Tanks constructed of corrosion resistant metals shall be designed tomeet the same structural requirements outlined in section 2.1.1. andshall not be required to be painted. Corrosion resistant metals shallbe chosen to resist corrosion from all naturally occurring chemicalsin the water stored, all chemicals added as part of water treatmentincluding the addition of chlorine and other disinfectants, and thenatural atmosphere including current and expected future airpollutants in the area.7.0.11. Drains on Unpressurized Tanks and ReservoirsUnpressurized tanks and reservoirs shall be equipped with a drain and havefacilities for collecting bacteriological samples.a. Elevated tanks and standpipes with a nominal capacity of 30,000 gallonsor more that provide pressure by gravity shall be equipped with a firehydrant with one pumper (steamer) nozzle of approximately 4½ inches indiameter and two hose nozzles of approximately 2½ inches diameter. Thepiping, valves, and fire hydrant shall be designed and constructed to allowthe tank to be taken off line and drained through the fire hydrant.b. Other above ground tanks shall be equipped with a fire hydrant or flushhydrant. The piping, valves, and hydrant shall be designed andconstructed to allow the tank to be taken offline and drained through theflush hydrant or fire hydrant.c. No drain shall have a direct connection to a sewer or storm drain. Thedesign and construction shall allow tanks and reservoirs to be takenoffline, drained, cleaned, repaired, and painted without causing loss ofpressure in the distribution system.7.0.12. Roofs and Sidewalls on Unpressurized Tanks and ReservoirsUnpressurized tanks and reservoirs shall have roofs and sidewalls designedand constructed to preserve the quality of the water stored.a. The roof and sidewalls must be water tight with no openings exceptproperly constructed vents, manways, overflows, risers, drains, pumpmountings, control ports, or piping for inflow and outflow.b. Any pipes running through the roof or sidewall of a finished water storagestructure must be welded or properly gasketed in metal tanks. In concretetanks these pipes shall be connected to standard wall castings. These wallcastings should have seepage rings imbedded in the concrete.c. Openings in a structure roof or top designed to accommodate controlapparatus or pump columns shall be curbed and sleeved with properAug. 29, 2003Page 137
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Design GuideforCommunity Water Syst
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2.18. AUTOMATION. .................
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4.3.11. Waste Disposal. ...........
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CHAPTER 6 -- MINIMUM CONSTRUCTION R
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Maximum Hour Demand -- The amount o
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and deviations are subject to indiv
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(blank)Aug. 29, 2003Page viii
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a. A description of the nature and
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a. Hydrological data, stream flow,
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4. Be conducted under the same oper
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maintaining the new technology and
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1.2.1. Plans shall include:a. Suita
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name, number, effective date, publi
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e. The site will provide all-weathe
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chlorine residual by methods in "St
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etween them, a six-inch band of con
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a. Regulated recreational activitie
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e done to determine the degree and
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1. Pumping rate;2. Pumping water le
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sieve analyses of the water bearing
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e circulated in the annular space s
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emoved. Therefore, every well shoul
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3.2.6.4. Pitless well units.a. The
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SIZE (inches)6 id.8101214 od.161820
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Chapter 4 -- Tre atment4.0. General
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settling basins shall be not less t
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3. Shall have valves located outsid
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d. Be automatic. Timers on automati
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2. Uniformity coefficient not great
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j. During air scour, the backwash w
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. An easily readable meter or flow
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4.3.4. Design Pressure Drop or Tran
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4.3.9. Flow Meters.Totaling rate of
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utilized, shall be 1.0 milligrams p
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. Removal of precursors prior to ch
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5. Consideration shall be given to
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. Pre-treatment requirements. Iron,
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t. Housing. Bagged salt and dry bul
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4.7. Iron and Manganese ControlIron
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Where phosphate treatment is used,
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3. Series and parallel flow piping
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approval of the department before u
Page 104 and 105: contact time must be provided to co
Page 106 and 107: a. Sanitary sewers with the approva
Page 108 and 109: 1. Obtain a letter of approval from
Page 110 and 111: 6. The provisions for the final dis
Page 112 and 113: a. Missouri River or Mississippi Ri
Page 114 and 115: 5.0.3. General equipment design.Gen
Page 116 and 117: minimize chemical dust created by t
Page 118 and 119: 1. At least 30 days of chemical sup
Page 120 and 121: e. Hand pumps shall be provided for
Page 122 and 123: 5.2. Chemicals.5.2.1 Shipping conta
Page 124 and 125: outside atmosphere, above grade and
Page 126 and 127: 5.4.2. Acids.a. Acids shall be kept
Page 128 and 129: 4. Anhydrous ammonia contact with c
Page 130 and 131: combustible material.2. Powdered ac
Page 132 and 133: fluoride feed line when a metering
Page 134 and 135: possibility for overfeed.h. Protect
Page 136 and 137: caution.d. Where taste and odor con
Page 138 and 139: e installed to monitor the flow of
Page 140 and 141: the generator dielectrics. Sufficie
Page 142 and 143: published by the National Fire Prot
Page 144 and 145: g. Water from pump gland drainage s
Page 146 and 147: 6.3. Pumps.6.3.1.Pumps shall be siz
Page 148 and 149: 6.4.2.2. Suction lines.Suction line
Page 150 and 151: cessation of minimum essential serv
Page 152 and 153: parameters: average winter (Decembe
Page 156 and 157: additional shielding to prevent the
Page 158 and 159: largest pump out of service shall b
Page 160 and 161: 7.1.4. CostsAs part of the final en
Page 162 and 163: 7.4. Hydropneumatic Storage7.4.1. H
Page 164 and 165: provided on larger tanks as needed
Page 166 and 167: 7.5.2. Fire Suppression Rating Sche
Page 168 and 169: in areas served by rural water dist
Page 170 and 171: connected directly to any sewer. Su
Page 172 and 173: 8.6.5. Force mains.There shall be a
Page 174: 8.11.2. Filling device.A filling de
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