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Section Cover Page

Section 023192000-03-22 Trench Excavating and Backfilling

Use this Section to specify requirements which apply specifically to excavating, backfilling, andcompacting trenches required for installation of underground services, occurring within and outsideperimeter of buildings or structures. Underground services may include pipes, ducts, ductbanks,conduit, cable, wire, etc.

This Master Specification Section contains:

.1 This Cover Sheet

.2 Specification Section Text:

1. General

1.1 Intent

1.2 Section Includes

1.3 Related Requirements1.4 Related Work Specified in Other Sections/Divisions

1.5 Coordination

1.6 Unit Prices

2. Products

2.1 Fill Materials

3. Execution

3.1 Excavation

3.2 Placement and Compaction of Fill Material

3.3 Utility Crossings

3.4 Pipe Trench Width

3.5 Pipe Trench Width Schedule

3.6 Backfilling Schedule

BMS Basic Master Specification

Alberta Infrastructure

Master Specification System

Page 0

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Section 02319

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1. General

1.1 INTENT

.1 Read this Section in conjunction with:

.1 [Earthwork Testing: Section 02010.]

.2 Fill Materials: Section 02056.

.3 Earthwork General Requirements: Section 02305.

1.2 SECTION INCLUDES

.1 This Section includes requirements for excavating, backfilling, and compacting trenchesrequired for installation of underground services, occurring within and outside perimeterof buildings or structures. Underground services may include pipes, ducts, ductbanks,

conduits, cable and wire.

1.3 RELATED REQUIREMENTS

.1 Mechanical and ElectricalService Connections: Division 1.

1.4 RELATED WORK SPECIFIED IN OTHER SECTIONS/DIVISIONS

.1 Pipe bedding for pipe utility systems: Section [02 ]

.2 Pipe bedding for mechanical services: Division 15.

.3 Pipe bedding for electrical services: Division 16.

1.5 COORDINATION

.1 Coordinate work specified in this Section with pipe bedding and other related workspecified in other Sections.

1.6 UNIT PRICES

.1 Trench Excavating And Backfilling:

.1 Unit Description: Temporary access, excavating, dewatering, sheathing and

shoring, [support, of existing utilities], backfilling and disposal of excess and wastematerial.

.2 Unit of Measurement: Metre length of trench.

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SPEC NOTE: Include following paragraph for gravity sewer or other graded utility lines wherepayment is to be made for different depth ranges.

.3 Method of Measurement: Where depth of utility line varies, depth shall be

measured from original grade elevation at centre line of utility to utility invert.Three depth measurements, one at each manhole and one at mid-point betweenmanholes, will be taken for each section of line. A section is defined as thecentreline distance between successive manholes. The average of the threemeasurements shall be the depth for that section.

SPEC NOTE: Include the following, Topsoil Excavation, when no other site work is being carriedout.

.2 Topsoil Excavation:

.1 Unit Description: Stripping and [stockpiling] [disposal off-site].

.2 Unit of Measurement: [Cut measure] [truck measure] [stockpile measure].

.3 [ ] Fill Material:

.1 Unit Description: [ ] material as specified in Section 02056].

.2 Unit of Measurement: [Excavated quantity, measured by [cubic metre] [truck][tonne].] [Compacted in-place quantity, measured by [cubic metre] [truck] [tonne][square metre measured parallel to surface for specified thickness].]

.4 [ ] Fill Material:

.1 Unit Description: [ ] material as specified in Section 02056].

.2 Unit of Measurement: [Excavated quantity, measured by [cubic metre] [truck][tonne].] [Compacted in-place quantity, measured by [cubic metre] [truck] [tonne][square metre measured parallel to surface for specified thickness].]

2. Products

2.1 FILL MATERIALS

.1 Refer to Section 02056 for fill material product specifications.

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3.5 PIPE TRENCH WIDTH SCHEDULE

No. of Pipes

Minimum

Trench Width

Maximum

Trench Width

Single pipe,850 mm diameteror less

300 mm greater thanexternal pipediameter

450 mm greater than external pipediameter or 750 mm totaltrench width, whichever isgreater

Single pipe,greater than850 mm diameter

300 mm greater thanexternal pipediameter

600 mm greater thanexternal pipe diameter

Multiple pipes,side by side

300 mm greater thanhorizontal dimensionacross outer edges of pipes

600 mm greater than horizontaldimension across outer edges ofpipes

3.6 BACKFILLING SCHEDULE

Location Fill MaterialMax. LiftThickness

MinimumCompaction

Under interiorslabs-on-grade

[ ] [ ] mm [ ] %

Under exteriorslabs-on-grade

[ ] [ ] mm [ ] %

Under landscapedareas

[ ] [ ] mm [ ] %

Under paved areas [ ] [ ] mm [ ] %

[ ] [ ] [ ] mm [ ] %

Other locations [ ] [ ] mm [ ] %

END OF SECTION