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

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minimize chemical dust created by the feeding process;k. Have solution tanks that are sized according to the amount of chemical tobe fed. Undersized or oversized solution tanks shall be avoided; andl. Have rate-of-flow meters on each solution-tank water line to control theamount of solution water going to dry feeder solution tanks.5.1.4. Positive displacement solution pumps.a. Positive displacement type solution feed pumps should be used to feedliquid chemicals, but should not be used to feed chemical slurries.b. Bypass piping or other methods for accurately measuring the output of thechemical solution feeders shall be provided.c. Graduated measuring chambers should be built into the feeder piping toallow the feeder output to be routinely checked.5.1.5. Liquid chemical feeders - Siphon control.Liquid chemical feeders shall be such that chemical solutions cannot besiphoned into the water supply. Liquid chemical feeders shall:a. Assure discharge at a point of positive pressure;b. Provide vacuum relief;c. Provide a suitable air gap; ord. Provide diaphragm anti-siphon devices that are spring-loaded in the closedposition on the discharge side of each metering pump head or othersuitable means or combinations as necessary. When metering pump antisiphondevices are provided, they should be selected to provide thebackpressure required by the pump manufacturer.5.1.6. Backflow Prevention.a. A reduced pressure principle backflow prevention assembly shall beprovided on the service line supplying water to the water treatment plantaccording to the requirements of 10 CSR 60-11.010.b. Backflow prevention shall be provided to ensure that the service waterlines discharging to solution tanks shall be properly protected frombackflow.1. Air gap separation shall be two times the pipe diameter of the waterline serving any chemical solution tank.2. Atmospheric vacuum breakers conforming to the American Society ofSanitary Engineering (ASSE) standard #1001, shall be applied to waterlines serving chemical solution tanks where no shut off or controlvalves are located downstream of the vacuum breaker.3. Pressure vacuum breakers conforming to ASSE standard #1020 shallbe applied to water lines serving chemical solution tanks where shutoff or control valves are located downstream of the vacuum breaker.c. No direct connection shall exist between any sewer and a drain oroverflow from a feeder, solution chamber or tank. All drains shall end atAug. 29, 2003Page 98
least six inches or two pipe diameters, whichever is greater, above theoverflow rim of a receiving sump, conduit or waste receptacle.5.1.7. Chemical feed equipment location.Unless otherwise approved by the department chemical feed equipment shall:a. Be located in a properly vented separate room(s) to reduce hazards anddust problems;b. Be conveniently located near points of application to minimize length offeed lines;c. Be readily accessible for servicing, repair and observing operation;d. Be located so as to provide feeding by gravity;e. Be located in a well-lighted area such that additional lighting is notrequired for normal operation and maintenance;f. Be located in areas provided with the drains, sumps, finished waterplumbing and the hose bibs and hoses necessary to fill solution tanks,clean up spills, and wash equipment;g. Be located in areas that have floors and walls constructed of material thatis suitable to the chemicals being stored and that is capable of beingwashed; andh. Be located in areas with floor surfaces that are smooth and impervious,slip-resistant, and well drained with three inches per ten feet minimumslope.5.1.8. Service water supply.a. The quality of service water supplied to a treatment facility shall becompatible with the purposes for which it is used. Generally, only potablewater should be used. Any proposal to use non-potable plant servicewater shall be submitted to and approved by the department beforeconstruction. When potable water is not used, the hose bibs and all waterlines carrying non-potable water shall be clearly labeled. No crossconnectionbetween potable and non-potable water lines is allowed.b. The amount of solution water used to operate the feeders in a plant shouldbe kept to the minimum necessary. This is especially important in smallwater treatment facilities. When specifying chemical feeders, the amountof service water required to operate the feeder must be considered.c. Service water supply shall be:1. Ample in supply and adequate in pressure;2. Provided with a totaling water meter to determine the amount of waterused by the plant;3. Properly treated for hardness, when necessary; and4. Properly protected against backflow.5.1.9. Storage of chemicalsa. Space shall be provided for:Aug. 29, 2003Page 99
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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
Page 65 and 66: Chapter 4 -- Tre atment4.0. General
Page 67 and 68: settling basins shall be not less t
Page 69 and 70: 3. Shall have valves located outsid
Page 71: d. Be automatic. Timers on automati
Page 76 and 77: 2. Uniformity coefficient not great
Page 78 and 79: j. During air scour, the backwash w
Page 80 and 81: . An easily readable meter or flow
Page 82 and 83: 4.3.4. Design Pressure Drop or Tran
Page 84 and 85: 4.3.9. Flow Meters.Totaling rate of
Page 86 and 87: utilized, shall be 1.0 milligrams p
Page 88 and 89: . Removal of precursors prior to ch
Page 90 and 91: 5. Consideration shall be given to
Page 92 and 93: . Pre-treatment requirements. Iron,
Page 94 and 95: t. Housing. Bagged salt and dry bul
Page 96 and 97: 4.7. Iron and Manganese ControlIron
Page 98 and 99: Where phosphate treatment is used,
Page 100 and 101: 3. Series and parallel flow piping
Page 102 and 103: 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 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 154 and 155: a. Overflows shall be sized to perm
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
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7.5.2. Fire Suppression Rating Sche
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in areas served by rural water dist
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connected directly to any sewer. Su
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8.6.5. Force mains.There shall be a
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8.11.2. Filling device.A filling de
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