Design and Construction Standards - Tualatin Valley Water District

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Fire Hydrants Section 52. Kennedy K-813. Waterous Pacer4. M & H Model 1295. American AVK5.3 Constructionh. Drain rock for hydrant installation shall be 1-1/2”-3/4” and meet therequirements of ODOT Section 00430.11.a. Hydrant Installation1. Hydrant installation shall conform to Standard Details 100, 101, and 102 as wellas Section 3.7 of ANSI/AWWA C600, except where otherwise specified.2. Connect to existing mains with tapping sleeve and gate valve installed per Section3.3.c and Standard Detail 8. Tapping valve shall be flange by MJ gate valve andshall match hydrant line size.3. For hydrant installations in conjunction with new main construction, connect tomain with standard MJ by MJ by flange tee fitting and flange by MJ gate valve.4. Do not excavate below sub base grade. Backfill overexcavated areas with crushedrock per the requirements of Section 2.2.b to provide a firm foundation.5. Provide a square, level, concrete pier block underneath the hydrant. Block shall beeight inches thick and 12 inches on each side.6. Place hydrant carefully to avoid damage to the pier block. Jointing procedures shallconform to Section 4.3 of ANSI/AWWA C600.7. All joints shall be restrained using MJ restrained joint follower glands per Chapter 3.8. After hydrant is in place and connected to the pipeline, place temporary blocks tomaintain the hydrant in a plumb position during subsequent work.9. Place geotextile fabric on base rock before placement of drain rock around baseblock and hydrant bottom after hydrant has been placed. The drain rock pocketshall be not less than four cubic feet, and the top of gravel shall be not less thansix inches above the hydrant drain opening. Once drain rock is in place bringremaining geotextile fabric over the top of the drain rock. Do not connect drainagesystem to sewer.10. Set all hydrants plumb and nozzles parallel with, or at right angles to, the curb.When placed behind the curb or sidewalk, set hydrant barrel so that no portion ofthe pumper hose nozzle cap is less than 18 inches from the top face of the curb orbackside of the sidewalk (if curbtight).11. With the pumper nozzle facing the curb, set hydrants so that the safety flange is aminimum of three inches and a maximum of six inches above finished grade orsidewalk level.12. Improperly positioned hydrants shall be disconnected and relocated at theContractor's expense.TVWD Water System Standards June 2012 Page 5-2
Water Service Connections Section 6Section 6Water Service Connections6.1 General Requirementsa. The customer shall pay for service installations in advance, based on meter size.Contact the District for fees.b. For new services in partitions and subdivisions, the Developer shall submit a copyof the preliminary plat showing lot numbers at least ten days prior to prepaymentof service fees.c. Service installation fees are based on excavation of clean native materials. Extracosts, including but not limited to excavation of hard rock material or boulders,removal of excess material, and re-compaction for trenches, shall be borne by theDeveloper.d. Curbs1. Curbs shall be installed prior to the installation of service lines and meter boxes.The area behind the curb shall be leveled within ten feet of the back of curb toallow room to facilitate the installation of service boxes at proper elevation.2. If no curbs are planned, meter location and grade hubs shall be staked for eachmeter. See Standard Details 7, 7D, 7PD, 7P for water service typical installations.3. The lot lines shall be clearly marked with lot numbers on the face of curb beforeservice layout will be completed by the Inspector. The District’s installation crew willbe notified once the service layout has been completed.e. Service Installation1. All water meters, meter boxes, meter vaults, and service lines and taps for 2-inchand smaller services shall be installed by District crews unless otherwiseauthorized by the District Engineer. Service installation will be scheduled only afterwork activities outlined in Section 6.1.d have been completed.2. Water service installation shall be after road subgrade is cut and road baserock isinstalled, and before installation of “dry” utilities is complete. Otherwise, additionalcosts may be incurred. The District will not be responsible for restoring finishedsubgrade.3. 1” and smaller taps for service connections shall be tapped directly into the ductileiron pipe. Taps larger than 1” shall use a tapping saddle.f. Water Services and Meters1. Pressure in Mainsi. District policy is to provide water service at a minimum pressure of 50 psi.Available pressure at specific locations may fall below this value dependingon geographic features within a particular pressure zone.TVWD Water System Standards June 2012 Page 6-1
Page 1 and 2: Design andConstruction StandardsDel
Page 3 and 4: Table of ContentsList of TablesList
Page 5 and 6: Water System Design and Constructio
Page 19 and 20: Trench Excavation and Backfill Sect
Page 21 and 22: Trench Excavation and Backfill Sect
Page 23 and 24: Water Mains Section 3Section 3Water
Page 25 and 26: Water Mains Section 33.2 Materials3
Page 27 and 28: Water Mains Section 3ii.iii.f. Flan
Page 29 and 30: Water Mains Section 33. Casing seal
Page 31 and 32: Water Mains Section 3ii.iii.c. Tapp
Page 33 and 34: Water Mains Section 3v. Measure the
Page 35 and 36: Water Mains Section 35. Operate all
Page 37 and 38: Valves and Valve Boxes Section 44.2
Page 39 and 40: Valves and Valve Boxes Section 44.
Page 41: Fire Hydrants Section 5Section 5Fir
Page 45 and 46: Water Service Connections Section 6
Page 47 and 48: Water Service Connections Section 6
Page 49 and 50: Precast Concrete Vaults Section 74.
Page 51 and 52: Section 8Backflow Prevention Genera
Page 53 and 54: Backflow Prevention General Require
Page 59: Standard DetailsTVWD Water System S

Design and Construction Standards - Tualatin Valley Water District

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