619Water Lines

Water Lines

Description

619.01This work consists of the construction of water lines per these specifications, the latest

revision of the American Water Works Association (AWWA) Standards and in conformity with the lines and grades shown on the plans or established. This work also includes furnishing pipe and installing it by jacking it into place at the location and in conformity with the lines and grades shown on the plans.

Materials

619.02Materials shall meet the requirements specified in the following subsections:

Cast Iron Pipe 716.01 Welded Steel Pipe 716.02 Galvanized Pipe 716.03 Copper Pipe 716.04 Plastic Pipe 716.05 Valves and Valve Boxes 716.07

Specific type of material, when required, will be shown on the plans or as designated. The maximum working water pressure will be shown on the plans. Welded steel pipe, when used as a casing and not as a carrier pipe, will not require full depth welds or welds from both sides, and will not require coatings. Sections of the casing shall be welded firmly together on the inside to prevent separation. Certification of the welder/operator will not be required.

Construction Requirements

619.03Trench shall be excavated to a width sufficient to allow for proper jointing of the water

line and thorough compaction of the backfill material per Section 206. Where ground water occurs, the bottom of the trench shall be kept free of water during pipe laying and until backfilled.

Backfilling shall consist of suitable materials uniformly distributed in layers of not more than 8 inches.

Each layer shall be thoroughly compacted as required. All joints, connections, valves and fittings shall be watertight.

construction methods. Method of installing pipe other than jacking may be used only with written approval from the Engineer. Trenching, jetting, or any other method that may cause damage to the embankment or highway area, or be hazardous to the traveling public, will not be permitted. When jacking is specified, the pipe must be jacked without disrupting highway traffic.

619.04 The sides of the jacking pit shall be supported in such a manner as to prevent any movement or slippage of the earth during the jacking operations.

A jacking frame shall be constructed of guide timbers or rails to the exact line and grade of the casing and shall be capable of maintaining the desired alignment and gradient throughout the jacking operation.

Depending upon the soil conditions, the excavation operation inside the pipe shall proceed approximately 1 foot ahead of the lead pipe. The excavation around the pipe shall be cut accurately to line and grade and as reasonably close to the outside diameter of the pipe as possible.

Each section of pipe in its final position shall be straight and true in alignment and grade. Deviation in alignment and grade from beginning to end of the jacked pipe shall not exceed plus or minus 0.3 foot per 100 feet of length.

Method of Measurement

619.04Water lines of the various types and sizes will be measured by the linear foot in

place and shall include all fittings. Valves, including valve boxes, will be measured by the actual number of the specified type and size used in the completed water lines and accepted.

The quantity of jacked pipe will be measured by the linear foot complete in place and accepted.

Basis of Payment

619.05The accepted quantities of water line will be paid for at the contract unit price for

each of the pay items listed below that appear in the bid schedule. Payment will be made under:

Pay Item Pay Unit ___ Inch Cast Iron Pipe Linear Foot ______ Inch Welded Steel Pipe Linear Foot ______ Inch Galvanized Pipe Linear Foot ______ Inch Copper Pipe Linear Foot ______ Inch Plastic Pipe Linear Foot ______ Inch (Type) Valve and Valve Box Each ______ Inch Welded Steel Pipe (Jacked) Linear Foot

Structure excavation and structure backfill for lines 12 inch and less will not be measured and paid for separately but shall be included in the work. Structure excavation and structure backfill for lines larger than 12 inch will be measured and paid for per Section 206.

All work incidental to installing jacked pipe will not be measured and paid for separately but shall be included in the work.

620.01