Design and Construction Standards - Tualatin Valley Water District

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Precast Concrete Vaults Section 7g. Vault Joints1. Preformed plastic gaskets for horizontal vault joints shall meet requirements ofFederal Specification SS-S-00210.2. Gaskets shall be:i. Kent Seal No. 2 manufactured by Hamilton Kent Manufacturing Companyof Kent, OHii. Ram-Nek by K.T. Snyder Company, Inc. of Houston, TXiii. Approved equalh. Grout and Dampproof Coatings1. Damp-proof the exterior below-grade walls and base with a water-based blend thatreacts with the free lime and calcium hydroxides in the concrete to seal the vault.An asphalt compound of brush or spray consistency conforming to FederalSpecification ASTM D449 may be used with the District Engineer's approval.2. Vaults damp-proofed using clear compounds shall be marked in black paint ashaving received such a coating. The markings shall indicate the type of materialused.7.3 Vault Installationa. Excavation, base rock, and backfill shall conform to Sections 2.1 and 2.8. Ifmaterial in bottom of excavation is unsuitable for supporting unit, excavate andbackfill to required grade with foundation stabilization as specified in Section2.1.6b. Place precast vaults in conformance with Standard Details 300, 310, and 811.c. Install preformed plastic gaskets for vault sections in accordance withmanufacturer's instructions and the following:1. Carefully inspect precast vault sections to be joined. Do not use sections with chipsor cracks in the tongue.2. Install gasket material in accordance with manufacturer's instructions. Use onlyprimer furnished by gasket manufacturer.3. Completed vaults shall be rigid and watertight.4. Top of vault lid shall be six inches above adjacent finished landscape grade.d. Pipe Penetrations1. Openings in vault walls shall be no larger than two inches greater than flangediameter of pipe being installed.2. Openings in knockout shall be made using a core drill or a series of smallerdiameter drill holes along the circumference of the opening with centers no morethan two inches in diameter.3. Prior to backfilling around vaults, use non-shrink grout to seal all joints and wallpenetrations, and patch wall areas with rock pockets.TVWD Water System Standards June 2012 Page 7-3
Section 8Backflow Prevention GeneralRequirements8.1 Purpose and General Requirementsa. Preservation of the quality of the public water supply is vital. No person maypurposefully create a cross-connection that may cause any wastewater, foreignliquids or substances, or water from an alternate water source to enter the publicwater system. When a cross-connection is identified, the owner must immediatelyremove the cross-connection or install an approved backflow preventer.b. This chapter is meant to provide a brief, though not exhaustive, overview ofbackflow assembly requirements. Cross-connections and backflow assembliesshall comply at all times with Oregon Administrative Rule (OAR) 333-61-0070,OAR 333-61-0071, the Uniform Plumbing Code (UPC), District Resolution 4-11,and amendments thereto. Contact the District Cross Connection Specialist forfurther information.c. Backflow assemblies shall be customer owned and maintained. Assemblies shallbe tested annually as well as after installation, repair, and relocation. The ownershall bear the testing costs. Tests shall be conducted by a certified tester orjourneyman plumber, as specified by OAR 333-061-0072.d. Backflow assemblies shall be installed on the service line at the property line, onprivate property outside of public easements. Per the District resolution,assemblies shall be available to inspection at all reasonable times.e. When a backflow assembly is installed behind the meter, thermal expansion mayoccur due to the building's hot water heater. The Uniform Plumbing Code requiresadditional equipment to be installed to control the thermal expansion.f. The District reserves the right to discontinue water service if a required backflowassembly is not installed, tested, and maintained, if it is removed or bypassed, orif an unprotected cross-connection exists. Service may not be restored until suchconditions or defects are corrected and verified by the District.8.2 Cases Where Backflow Prevention Assemblies are Requireda. Where there is an auxiliary water supply such as a well that is, or can be,connected to potable water piping.b. Where there is pressurized piping for conveying liquids other than potable water,and where that piping is in proximity to the potable water piping.c. Where there is intricate plumbing that makes it impractical to ascertain whetheror not a cross connection exists.TVWD Water System Standards June 2012
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 and 42: Fire Hydrants Section 5Section 5Fir
Page 43 and 44: Water Service Connections Section 6
Page 49: Precast Concrete Vaults Section 74.
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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