620Adjustment of Valve Boxes and Fire Hydrants

Adjustment of Valve Boxes and Fire Hydrants

620.1DESCRIPTION

1 This section describes the requirements for adjusting valve boxes, fire hydrants, and associated waterlines.

620.2MATERIALS

1 Provide materials in accordance with the following:

Material Subsection Admixtures 801.4 Aggregate for Concrete 803 Aggregate for Flowable Backfill 803 Bed Course Material 803 Curing Materials 802.1 Ductile Iron Water Pipe 808.12 Fly Ash 801.2 Portland Cement 801.1 Water 814.1

2 Provide polyvinyl chloride pressure pipe and associated fittings that meet the requirements of AWWA C900, AWWA C905, or AWWA 907 as appropriate.

620.3EQUIPMENT

1 Ensure that equipment meets the following:

Equipment Subsection Batch Plant 513.3.1 Mixers 513.3.2 Placing Equipment 513.3.3

620.4CONSTRUCTION

620.4.1 General

1 Adjust valve boxes and fire hydrants in accordance with the installation and material standards of the current Wyoming Public Works Standard Specifications and the owner.

2 Lay waterlines associated with adjustments on undisturbed material in trenches wide enough for proper installation and testing. Excavate in accordance with Subsection

Adjustment of Valve Boxes and Fire Hydrants SECTION 620

206.4.1, Excavation. When excavating below grade, place, shape, and compact bed course material as specified.

3 Before starting work, give the engineer and owner 24-hour notice. Do not start without the owner’s approval. Give notification for connections, service interruptions, line cleaning, pressure testing, and system disinfection. Minimize service interruptions, and notify users two hours or more before interrupting service. Unless otherwise required by the owner, notify fire departments 24 hours before interrupting service to hydrants.

4 Handle pipe, valves, and fixtures without causing damage; keep clean and store to prevent damage and excessive handling. Remove damaged or unsuitable material from the project.

5 Inspect each pipe joint or fixture and clean the inside before lowering into the trench. Prevent contaminants from entering during installation. Drain or pump water encountered during laying so that it does not enter the pipe.

6 Center each joint, fit tightly, and fasten in accordance with manufacturer’s recommendations.

620.4.2 Adjustments of Waterlines, Valves, Valve Boxes, and Fire Hydrants

1 When specified, adjust existing waterlines, valves, and hydrants for grades, locations, and street elevations . Remove and adjust items carefully to enable reuse. When salvaged items cannot be reused, install new items that meet specified requirements and the waterline owner’s specifications and standards. Place a concrete collar around valve boxes in accordance with the applicable sections of the current edition of Wyoming Public Works Standard Specifications.

620.4.3 Testing and Disinfecting Lines

1 Test and disinfect lines before backfilling in accordance with applicable municipal requirements or as specified.

620.

4.4Thrust Blocks

1 Brace fixtures that could blow off the line under pressure with a cast- in-place wedge block of class B concrete in accordance with Subsection 513.4.4, Mix Design. Mix and place in accordance with applicable portions of Subsection513.4, Construction. Cast the block between the fixture and undisturbed vertical trench wall in accordance with municipal requirements or as specified.

620.4.5 Backfilling

1 Do not place backfill containing rock or hard lumps larger than 2 in [50 mm] alongside or within 12 in [300 mm] of the pipe’s top. Place and compact backfill in accordance with

Adjustment of Valve Boxes and Fire Hydrants SECTION 620 Subsection 206.4.5, Backfilling, or, if the waterline is not located in the roadway, to at least the density of the adjacent material. When specified, use flowable backfill in accordance with Subsection 206.4.5.2, Flowable Backfill. During backfilling, brace hydrants, valve boxes, or other vertical fixtures and adjust the fixture’s top to correspond with the fixture’s established elevation.

620.5MEASUREMENT and PAYMENT

1 The engineer will measure Valve Boxes___ in [mm]; Fire Hydrant; Adjustments, Fire Hydrants; Adjustments, Valve Boxes; and Thrust Blocks by the each. 2 The department will measure and pay as follows: Pay Item Pay Unit Measure to the Nearest Pay to the Nearest Adjustments, Fire Hydrants EA [Ea] EA [Ea] EA [Ea] Adjustments, Valve Boxes EA [Ea] EA [Ea] EA [Ea] Fire Hydrant EA [Ea] EA [Ea] EA [Ea] Thrust Blocks EA [Ea] EA [Ea] EA [Ea] Valve Boxes in [mm] EA [Ea] EA [Ea] EA [Ea]