B30 Excavation and Backfill for Bridgeworks · Clause Number . Description of Revision . Authorised By . Date . Ed 3/Rev 0 (cont’d) Annex B30/1, B30/2 : Annexures renumbered B30/C

ROADS AND MARITIME SERVICES (RMS)

QA SPECIFICATION B30

EXCAVATION AND BACKFILL FOR BRIDGEWORKS

NOTICE

This document is a Roads and Maritime Services QA Specification. It has been developed for use with roadworks and bridgeworks contracts let by Roads and Maritime Services or by local councils in NSW. It is not suitable for any other purpose and must not be used for any other purpose or in any other context.

Copyright in this document belongs to Roads and Maritime Services.

REVISION REGISTER

Ed/Rev Number

Clause Number Description of Revision Authorised

By Date

Ed 1/Rev 0 First issued GM, CMS 28.02.91

Ed 2/Rev 0 Clause numbers and lists have been restructured to suit the new format. Title changed. Converted to MS Word 6.0c.

GM, RNIC (W Ho)

11.09.97

1.1 Relation to roadworks defined.

2.1, 3, 4.4 Hold Points rewritten.

1.2, 5.3 RTA T111 and T162 specified.

4.1 Blasting prohibited.

4.6 Heading and 2nd para. changed.

5 Materials, layer thicknesses and compaction redefined.

Annexure B30/2

New annexure for minimum frequency of testing.

Ed 3/Rev 0 Title “Clearing” deleted from title. GM, RNIC 22.10.03

Various “Superintendent” replaced by “Principal” References updated.

1.2 References transferred to Annex B30/M with minor changes. New introduction to annexures.

1.1, 2 Clearing requirements deleted.

1.2 New references added.

2 Compliance to environmental specifications added.

4.1 Avoid disturbance of survey marks added.

7, Annex B30/B

Payment requirements transferred to Annex B30/B.

Edition 4 / Revision 1 ROADS AND MARITIME SERVICES March 2018

Ed/Rev Number


By Date

Ed 3/Rev 0 (cont’d)

Annex B30/1, B30/2

Annexures renumbered B30/C and B30/E respectively.

Annex B30/M

New annexure for references.

Ed 3/Rev 1 1.2.2 Refer to RTA Q for definition GM, RNIC 03.11.04

1.2.3, 1.2.4, 4.4, 6

Minor editorial changes.

Annex B30/M

Refers to Clause 1.2.4. RTA Q added

Ed 3/Rev 2 1.2.3 Reference corrected. GM, RNIC 01.11.06

Global Minor formatting changes. (P Bamford)

Ed 3/Rev 3 Global Text revised to direct imperative style. GM, IC 22.03.12

3, 4, 5.1 Clauses reworded to improve clarity.

5.3 Table B30.1 – relative compaction. Absolute values replaced with characteristic values, consistent with R44.

Annex B Payment description amended. Item for mass concrete blinding layer added.

Ed 3/Rev 4 5.2, 5.3, Table B30.1

Backfill material now termed “Select Fill material”, consistent with terminology used in R44.

GM, IC 21.01.13

Ed 3/Rev 5 4.6, 5.2, 5.3, Table 1

Minor rewording. GM, IC 15.02.13

Ed 4/Rev 0 Global Clauses rearranged and reworded to improve clarity.

GM, CPS 27.03.15

1.1 Scope clarified. Excluded scope cross-referenced to specs R44, R11 and R58/R59.

1.2.1, 1.2.4 Standard sub-clauses on “Project Specific Requirements” and “Planning Documents” added; subsequent sub-clauses renumbered.

1.2.5 Previously sub-clause 1.2.3. Amended to include standard wording on frequency of testing.

1.3 New clause on Definitions added.

2 Clause title expanded to include safety.

2.1 New clause on Work Health and Safety added.

3 Clause reworded with correct terminology.

4.1 to 4.4 Individual clauses under existing clauses rearranged and reworded.

4.1 Headings added to form new sub-clauses 4.1.1 to 4.1.3.

ii

Ed/Rev Number


By Date


4.1.3 New clause on dealing with contaminated material in accordance with spec R44 added.

4.3 Headings added to form new sub-clauses 4.3.1 to 4.3.4.

5 Previously clause 4.6.

6 Previously clause 5. Individual clauses rearranged and reworded. Heading title changed.

6.1 Headings added to form new sub-clauses 6.1.1 and 6.1.2.

6.1.1 New sub-clause on extent of backfilling, with reference made to new Figures in Annex E.

6.2 Previous clause 5.2 (on Select Fill) expanded under new sub-headings to include requirements for earth fill and drainage zone material.

6.2.2 Select Fill property requirements changed.

6.2.3 Earth fill property requirements (identical to that in R44) added.

6.2.5 New clause on corrugated subsurface drainage pipe.

6.3 Age of structure before backfilling permitted distinguished between various types of structures.

6.4 Previously clause 5.3.

6.4.1 New clause on field moisture content added.

6.4.2 Maximum layer compacted thickness changed.

6.4.3 New clause on determination of field density and relative compaction added.

6.4.4 New clause on compaction method added.

6.4.5 Requirement to limit difference in levels to 500 mm when backfilling on opposing sides of frame structures moved here from spec R44.

6.5 New clause on drainage zone behind retaining structures added.

Annex B Pay Items changed.

Annex C2 Schedule of Identified Records added.

Annex D Planning Documents added.

Annex E Figures E.1 to E.5 showing indicative excavation and backfill volumes for payment added.

iii

Ed/Rev Number


By Date


Annex L Previously Annex E. Minimum frequency of testing amended.

Annex M Referenced Documents updated.

Ed 4/Rev 1 6.2.2 New clause on chemical properties of fill and drainage material added. Subsequent clauses renumbered.

DCS 29.03.18

6.2.2, 6.2.3, 6.2.4

Particle size distribution requirements for fill and drainage material further refined. Coefficient of uniformity added as additional requirement.

6.4.3 Table 6: “cohesionless materials” changed to “sand”.

Annex L Minimum frequency of testing amended.

Annex M Referenced Documents updated.

iv

QA SPECIFICATION B30


Copyright – Roads and Maritime Services IC-QA-B30

VERSION FOR: DATE:

Edition 4 / Revision 1 ROADS AND MARITIME SERVICES March 2018

Excavation and Backfill for Bridgeworks B30

CONTENTS

CLAUSE PAGE

FOREWORD ............................................................................................................................................... II RMS Copyright and Use of this Document ................................................................................... ii Revisions to Previous Version ....................................................................................................... ii Project Specific Changes ............................................................................................................... ii

1 GENERAL ........................................................................................................................................ 1 1.1 Scope .............................................................................................................................. 1 1.2 Structure of the Specification ......................................................................................... 1 1.3 Definitions ...................................................................................................................... 2

2 SAFETY AND ENVIRONMENTAL PROTECTION ................................................................................ 2 2.1 Work Health and Safety ................................................................................................. 2 2.2 Environmental Protection ............................................................................................... 3

3 COFFERDAMS AND SHORING .......................................................................................................... 3

4 EXCAVATION .................................................................................................................................. 3 4.1 General ........................................................................................................................... 3 4.2 Excavation of Stream Channel ....................................................................................... 4 4.3 Excavation for Construction of Structures ..................................................................... 4 4.4 Inspection of Foundation Material ................................................................................. 4

5 MASS CONCRETE BLINDING LAYER .............................................................................................. 5

6 BACKFILLING AGAINST STRUCTURES ............................................................................................ 5 6.1 General ........................................................................................................................... 5 6.3 Age of Structure Before Backfilling .............................................................................. 7 6.4 Placing and Compaction ................................................................................................. 8 6.5 Drainage Zone Behind Earth Retaining Structures ........................................................ 9 6.6 Disposal of Surplus Excavated Material ...................................................................... 10

ANNEXURE B30/A – PROJECT SPECIFIC REQUIREMENTS ...................................................................... 11

ANNEXURE B30/B – MEASUREMENT AND PAYMENT ............................................................................ 11

ANNEXURE B30/C – SCHEDULES OF HOLD POINTS AND IDENTIFIED RECORDS .................................... 13 C1 Schedule of Hold Points ............................................................................................... 13 C2 Schedule of Identified Records .................................................................................... 13

ANNEXURE B30/D – PLANNING DOCUMENTS ........................................................................................ 13

ANNEXURE B30/E – EXCAVATION, SELECT FILL AND DRAINAGE ZONE VOLUMES FOR MEASUREMENT AND PAYMENT PURPOSES ............................................................................................................ 14

ANNEXURES B30/F TO B30/K – (NOT USED)......................................................................................... 19

ANNEXURE B30/L – MINIMUM FREQUENCY OF TESTING ..................................................................... 19

ANNEXURE B30/M – REFERENCED DOCUMENTS .................................................................................. 20

Ed 4 / Rev 1 i

B30 Excavation and Backfill for Bridgeworks

LAST PAGE OF THIS DOCUMENT IS .......................................................................................................... 20

FOREWORD

RMS COPYRIGHT AND USE OF THIS DOCUMENT

Copyright in this document belongs to Roads and Maritime Services.

When this document forms part of a contract

This document should be read with all the documents forming the Contract.

When this document does not form part of a contract

This copy is not a controlled document. Observe the Notice that appears on the first page of the copy controlled by RMS. A full copy of the latest version of the document is available on the RMS Internet website: http://www.rms.nsw.gov.au/business-industry/partners-suppliers/specifications/index.html

REVISIONS TO PREVIOUS VERSION

This document has been revised from Specification RMS B30 Edition 4 Revision 0.

All revisions to the previous version (other than minor editorial and project specific changes) are indicated by a vertical line in the margin as shown here, except when the document has been extensively revised as in a new edition.

PROJECT SPECIFIC CHANGES

Any project specific changes are indicated in the following manner:

(a) Text which is additional to the base document and which is included in the Specification is shown in bold italics e.g. Additional Text.

(b) Text which has been deleted from the base document and which is not included in the Specification is shown struck out e.g. Deleted Text.

ii Ed 4 / Rev 0

http://www.rms.nsw.gov.au/business-industry/partners-suppliers/specifications/index.html

(RMS COPYRIGHT AND USE OF THIS DOCUMENT - Refer to the Foreword after the Table of Contents)

RMS QA SPECIFICATION B30


1 GENERAL

1.1 SCOPE

This Specification sets out the excavation and backfilling requirements associated with bridgeworks, including earth retaining structures. It also sets out the requirements for cofferdams and shoring, and mass concrete blinding layers.

Backfilling includes both backfilling of excavations up to the adjacent surface level, and backfilling to the levels shown on the Drawings, such as that behind bridge abutments and earth retaining structures.

This Specification does not cover:

(a) backfilling from the natural surface level up to the underside of the sill beam at “spill-through” bridge abutments – refer to Specification RMS R44 for the relevant requirements;

(b) backfilling against and over culverts or box section underpasses – refer to Specification RMS R11 for the relevant requirements;

(c) backfilling for reinforced soil walls – refer to Specification RMS R58 or R59 for the relevant requirements.

1.2 STRUCTURE OF THE SPECIFICATION

This Specification includes a series of annexures that detail additional requirements.

1.2.1 Project Specific Requirements

Project specific details of work are shown in Annexure B30/A.

1.2.2 Measurement and Payment

The method of measurement and payment is detailed in Annexure B30/B.

1.2.3 Schedules of HOLD POINTS and Identified Records

The schedules in Annexure B30/C list the HOLD POINTS that must be observed. Refer to Specification RMS Q for the definition of HOLD POINTS.

The records listed in Annexure B30/C are Identified Records for the purposes of RMS Q Annexure Q/E.

1.2.4 Planning Documents

The PROJECT QUALITY PLAN must include each of the documents and requirements listed in Annexure B30/D and must be implemented.

Ed 4 / Rev 1 1



1.2.5 Frequency of Testing

The Inspection and Test Plan must nominate the proposed frequency of testing to verify conformity of the item, which must not be less than the frequency specified in Annexure B30/L. Where a minimum frequency is not specified, nominate an appropriate frequency. Frequency of testing must conform to the requirements of RMS Q.

You may propose to the Principal a reduced minimum frequency of testing. The proposal must be supported by a statistical analysis verifying consistent process capability and product characteristics. The Principal may vary or restore the specified minimum frequency of testing, either selectively or permanently, at any time.

1.2.6 Referenced Documents

Unless specified otherwise, the applicable issue of a referenced document, other than an RMS Specification, is the issue current at the date one week before the closing date for tenders, or where no issue is current at that date, the most recent issue.

Standards, specifications and test methods are referred to in abbreviated form (e.g. AS 1234). For convenience, the full titles are given in Annexure B30/M.

1.3 DEFINITIONS

The terms “you” and “your” mean “the Contractor” and “the Contractor’s” respectively.

The following definitions apply to this Specification:

Contaminated material

Material classified as Restricted, Hazardous or Special Waste in accordance with EPA Waste Classification Guidelines.

Earth retaining structures

Structures which are designed and constructed to retain earth. They include retaining walls and bridge abutments (including the sill beam of spill-through abutments).

Frame structures

Structures with their members joined together by moment resisting connections, such as integral and semi-integral bridges.

Select Fill Fill material of specified quality placed against or adjacent to structures. This material is different from Selected Material (refer RMS R44 for definition of Selected Material).

2 SAFETY AND ENVIRONMENTAL PROTECTION

2.1 WORK HEALTH AND SAFETY

Implement work health and safety measures, including preparation of Safe Work Method Statements, in accordance with Specification RMS G22.

2 Ed 4 / Rev 0



2.2 ENVIRONMENTAL PROTECTION

Implement appropriate environmental control measures in accordance with Specifications RMS G36 and G38.

3 COFFERDAMS AND SHORING Cofferdams must be constructed sufficiently watertight to prevent water seepage through the sides during concreting, which can cause damage to the freshly placed concrete.

Position the toe of the cofferdam sufficiently below the level of the bottom of the excavation, to avoid piping at the bottom of the excavation from water seepage.

Provide adequate bracing to the cofferdams. The construction of the cofferdam must be such that removal of the cofferdam will not damage the concrete structure.

Provide sufficient clearance within the cofferdam for construction and inspection of the exterior surfaces of the formwork and for pumping out water both inside and outside the forms as required.

HOLD POINT

Process Held: Construction of cofferdams and/or shoring.

Submission Details: At least 5 working days prior to the proposed date for commencement of construction, submit details of the cofferdams and/or shoring with details of clearances provided, together with a statement by a Chartered Professional Engineer experienced in this type of work, certifying the design.

Release of Hold Point: The Principal will consider the submitted documents prior to authorising the release of the Hold Point.

Do not incorporate material used in the construction of the cofferdam or shoring within the concrete of the finished structure, unless shown otherwise on the Drawings.

Remove any cofferdams and shoring, including temporary piles, to a minimum of 0.5 m below natural or finished surface, whichever is lower.

4 EXCAVATION

4.1 GENERAL

4.1.1 Survey Marks

During excavation and backfilling, do not disturb any survey bench marks, survey or level peg, plug, pipe or marking. Comply with the requirements of Specification RMS G71 on the care, protection and preservation of survey control marks.

Ed 4 / Rev 1 3



4.1.2 No Blasting

Do not use blasting in excavation for foundation members.

4.1.3 Contaminated Material

If contaminated material is encountered during excavation, notify the Principal immediately and deal with the contaminated material in accordance with RMS R44.

4.2 EXCAVATION OF STREAM CHANNEL

Where excavation of a stream channel is required, the excavation must extend to join the existing stream bed in such a manner as to allow the smooth flow of water past the structure.

4.3 EXCAVATION FOR CONSTRUCTION OF STRUCTURES

4.3.1 General

Excavate for construction of structures to the depth and profile shown on the Drawings. The Principal may direct excavation to a different level from that shown on the Drawings.

Avoid disturbing the material below the required excavation level shown on the Drawings.

Remove all loose material from within the excavation before placing concrete.

4.3.2 Foundations on Rock

For foundations bearing on rock, thoroughly clean out any minor fissures in the rock and refill the fissures with concrete, mortar or grout. Wet the rock surface prior to placing concrete.

Fill any over-excavation in rock with concrete of the same quality as that of the overlying concrete structure.

4.3.3 Foundations on Earth

For foundations bearing on earth, backfill any over-excavation under the foundation member with Select Fill complying with Clause 6.2.2, or concrete of the same quality as the overlying concrete structure.

4.3.4 Excavation for Anchor Beams

Excavate for anchor beams, anchor blocks, and other similar members in a manner such that concrete for the member placed within the excavation is in direct contact with the sides of the excavation.

If side forms are used, fill the space between the concrete member and the sides of the excavation remaining when forms are removed with concrete of the same quality as that of the member.

4.4 INSPECTION OF FOUNDATION MATERIAL

Prior to placing concrete for the mass concrete blinding layer, present the excavated foundation area for inspection by the Principal.

4 Ed 4 / Rev 0



HOLD POINT

Process Held: Placing of concrete for mass concrete blinding layer for each foundation member (except foundation members supported by piles).

Submission Details: Conformity records for levels and dimensions of excavation, for each foundation member.

Release of Hold Point: The Principal will inspect the foundation material, and may direct further excavation, prior to authorising the release of the Hold Point.

Where further excavation is directed, the above Hold Point will again apply after the completion of the excavation to the new levels or new dimensions.

5 MASS CONCRETE BLINDING LAYER Where shown on the Drawings, place unreinforced mass concrete as a blinding layer over the earth foundation material. Do not place concrete in the presence of surface or seepage water.

The concrete for the blinding layer must be of the same quality as that of the overlying concrete structure, unless shown otherwise on the Drawings.

The mass concrete layer must be brought to a level finish unless shown otherwise on the Drawings and allowed to harden sufficiently before any subsequent operation over it can take place, to avoid damage to the layer.

6 BACKFILLING AGAINST STRUCTURES

6.1 GENERAL

6.1.1 Extent

Backfill against structures to the details shown on the Drawings. Where not shown on the Drawings, backfill against structures with Select Fill and drainage zone material to the extent indicated in Figures B30/E.1 to B30/E.5.

6.1.2 Remove Foreign Material

Prior to backfilling, remove all foreign material such as waste concrete and timber from within the excavation.

6.2 FILL AND DRAINAGE MATERIAL

6.2.1 General

Fill material for backfilling and granular drainage material must be free of timber and rubbish.

Where these materials are imported, provide the Principal with details of the proposed source locations, quantities and types of material before the imported material is delivered to site.

Ed 4 / Rev 1 5



6.2.2 Chemical Properties

The chemical properties of placed Select Fill, earth fill and drainage material must conform to Table B30.1.

Table B30.1 – Chemical Properties of Fill and Drainage Material

Property Test Method Requirement

pH RMS T123 ≥ 5.5

Sulfates (expressed as SO4) RMS T1011 ≤ 1,000 mg/L

Chlorides RMS T1010 ≤ 200 mg/L

6.2.3 Select Fill

Select Fill must conform to the requirements shown in Table B30.2, and must be capable of achieving the relative compaction specified in Clause 6.4.

Table B30.2 – Select Fill Material Properties


Particle size distribution: RMS T106, T107 (1)

Percentage passing AS Sieve (by mass)

53 mm 100%

37.5 mm > 60%

2.36 mm < 50%

75 µm < 15%

Coefficient of uniformity (2) RMS T106, T107 (1) > 5

Plasticity Index RMS T108, T109 ≤ 15

Notes: (1) After pretreatment in accordance with Test Method RMS T102. (2) Coefficient of uniformity = D60/D10, where D60 and D10 are the equivalent sieve sizes in mm which 60%

and 10% of the Select Fill passes respectively, as interpolated from particle size distribution curve.

6.2.4 Earth Fill

Earth fill must conform to the requirements shown in Table B30.3, and must be capable of achieving the relative compaction specified in Clause 6.4.

6 Ed 4 / Rev 0



Table B30.3 – Earth Fill Material Properties


Maximum particle dimension RMS T280 200 mm

Particle size distribution: RMS T106


37.5 mm > 60%

Coefficient of uniformity (1) RMS T106, T107 > 5

Notes: (1) Coefficient of uniformity = D60/D10, where D60 and D10 are the equivalent sieve sizes in mm which 60%

and 10% of the Earth Fill passes respectively, as interpolated from particle size distribution curve.

6.2.5 Drainage Zone Material

Drainage zone material must be clean, graded, hard and durable, of either crushed stone or river gravel, conforming to the requirements shown in Table B30.4:

Table B30.4 – Drainage Zone Material Properties


Particle size distribution: RMS T106


53 mm 100%

9.5 mm < 5%

6.2.6 Corrugated Perforated Plastic Subsurface Drainage Pipe

Corrugated perforated plastic subsurface drainage pipe must comply with Specification RMS 3552.

6.3 AGE OF STRUCTURE BEFORE BACKFILLING

Unless specified otherwise on the Drawings, carry out backfilling only at the following times:

(a) Against concrete members other than those in items (b) or (c)

Do not carry out backfilling until at least 7 days has elapsed after concrete placement, or at least 75% of the specified minimum 28 day concrete compressive strength of the member has been achieved, whichever is earlier.

(b) Against concrete earth retaining structures (e.g. cantilever retaining walls and conventional bridge abutments)

Do not carry out backfilling until at least 100% of the specified minimum 28 day concrete compressive strength of the structure has been achieved, but in any case not earlier than 7 days after concrete placement.

(c) Against concrete frame structures (e.g. integral and semi-integral bridge abutments)

Ed 4 / Rev 1 7



In addition to the requirements of item (b) above, do not carry out backfilling until the compressive strength of the concrete in the bridge deck (or horizontal connecting slab) has reached at least 75% of the specified minimum 28 day concrete compressive strength.

6.4 PLACING AND COMPACTION

6.4.1 Field Moisture Content

Unless otherwise specified or authorised by the Principal, the field moisture content of the Select Fill and earth fill at the time of placing must be between 60 to 90% of the optimum moisture content.

Determine the field moisture content in accordance with Test Methods RMS T120, T121 or T180. Only use T121 and T180 where results have previously been checked against those of T120 for the range of materials being compacted, using Test Method RMS T2105.

6.4.2 Layer Thickness and Relative Compaction

Place Select Fill and earth fill in layers of (compacted) thickness not exceeding that shown in Table B30.5, and compact to the relative compaction requirements shown in Table B30.5.

Conformity of a Lot is achieved if the characteristic value of relative compaction of that Lot is not less than the lower limit specified in Table B30.5.

Table B30.5 – Fill Materials, Layer Thickness and Compaction

Fill Type Location Maximum

Layer Thickness (2)

Relative Compaction

(3)

Select Fill Below foundations on earth where over-excavation has occurred (refer Clause 4.3.3).

150 mm (4) 102%

Select Fill Behind abutments and retaining walls (1) within a distance of H/2 from edge of base slab, where H is distance between the base of the footing and the top of the wall, as indicated in Figures B30/E.1 to B30/E.4.

150 mm (4) 98%

Earth Fill All other locations as indicated in Figures B30/E.1 to B30/E.5

300 mm 98%

Notes: (1) “Behind … walls” refers to the backfilled side of the walls. (2) Layer thickness after compaction. (3) Lower limit of characteristic value of relative compaction. (4) May be increased to 200 mm away from abutments or retaining walls where machines heavier than one tonne

are permitted in compaction.

6.4.3 Determination of Field Density and Relative Compaction

Determine the field (insitu) density using either Test Methods RMS T173 using a nuclear gauge, RMS T119 using the sand replacement method, or RMS T165 using the fixed volume extractive method. The situations where these test methods are applicable are shown in Table B30.6.

8 Ed 4 / Rev 0



Table B30.6 – Applicable Test Methods for Determining Field Density and Relative Compaction

Fill Material Properties Test Method / Actions

≤ 20% by mass retained on 37.5 mm AS sieve Either T173 (nuclear gauge) or T119 (sand replacement method)

> 20%, ≤ 40% by mass retained on 37.5 mm AS sieve T119 (sand replacement method) (1)

> 40% by mass retained on 37.5 mm AS sieve Report only % by mass of oversize material (2)

Fine to medium grained sand, including single size material or gap graded material

T165 (fixed volume extractive method)

Notes: (1) If % by mass retained on 37.5 mm AS sieve is between 20% and 40%, do not use the nuclear gauge method. (2) If % by mass retained on 37.5 mm AS sieve is greater than 40%, do not report the relative compaction as the

test result obtained is not valid.

Do not use RMS T173 (nuclear gauge) for insitu density tests if the layer thickness exceeds 300 mm.

Calculate the relative compaction using Test Method RMS T166.

Determine the characteristic value of relative compaction in accordance with RMS Q. Round off the relative compaction value and the characteristic relative compaction value to the nearest 0.1%.

6.4.4 Compaction Method

Start the compaction at areas immediately adjacent to the wall, and then gradually proceed away from the wall.

Do not use vibrating rollers of mass exceeding one tonne, or any other equipment that may potentially cause damage to the earth retaining structure, to compact fill material located within 2 m behind the structure. Provide, as part of your PROJECT QUALITY PLAN, details of your method for compaction of fill located within this zone.

6.4.5 Backfilling Against Several Sides

When backfilling against several sides of a structure is required, maintain the level of the backfill at approximately the same levels on opposing sides during backfilling.

In the case of frame structures (refer Clause 1.3 for definition), at any time during backfilling, the difference in level of the backfill at opposing sides must not exceed 500 mm.

6.5 DRAINAGE ZONE BEHIND EARTH RETAINING STRUCTURES

Place granular drainage material complying with Clause 6.2.4 in the drainage zone behind retaining structures to the extent shown on the Drawings; or where not shown on the Drawings, to the extent shown in Figures B30/E.1 to B30/E.5.

Provide within the drainage zone a corrugated perforated plastic subsurface drainage pipe, discharging into the drainage system.

Provide a geotextile complying with Specification RMS R63 to separate the granular drainage material from the adjoining fill material.

Ed 4 / Rev 1 9



Alternatively, subject to the Principal’s concurrence, where the drainage zone is less than 3 m high, the granular drainage material may be substituted by a geocomposite membrane of equivalent drainage capacity, at no additional cost to the Principal.

6.6 DISPOSAL OF SURPLUS EXCAVATED MATERIAL

Unless otherwise specified or approved by the Principal, remove and dispose of all surplus excavated material from the Site.

10 Ed 4 / Rev 0



ANNEXURE B30/A – PROJECT SPECIFIC REQUIREMENTS Refer to Clause 1.2.1.

NOTES TO TENDER DOCUMENTER: (Delete this boxed text after completing Annexure B30/A)

Detail here any project specific requirements.

ANNEXURE B30/B – MEASUREMENT AND PAYMENT Refer to Clause 1.2.2.

In the Schedule of Prices accompanying the Lump Sum Tender, payment for the cost of excavation and backfilling for bridgeworks will be made under the following items (a) to (f).

The volumes of excavation and backfilling are measured net, with no account taken in the measurement for payment of any additional excavation and backfilling necessitated by the construction method adopted, and the rates are deemed to have made due allowance for any additional excavation and backfilling, or temporary support in lieu of the additional excavation, so required.

(a) Excavation to Required Levels

The unit of measurement is the “cubic metre” of bank volume of excavation.

The volume for payment is the volume of excavation necessary to construct the structures shown on the Drawings, and guided by the principles shown in Figures B30/E.1 to B30/E.5. It includes excavation for construction of mass concrete blinding layer and placing of Select Fill, but excludes any over-excavation and any additional excavation necessitated by the construction method adopted, such as having to form temporary batters.

The rate is an average rate to cover excavation in all types of materials and includes disposal of surplus excavated material.

(b) Additional Excavation as Directed - Provisional Quantity

The unit of measurement is the “cubic metre” of bank volume of additional excavation, as directed by the Principal. The quantity is a Provisional Quantity.

The volume for payment is determined by survey or manual measurement, and calculation.

The rate is an average rate to cover excavation in all types of materials and includes disposal of surplus excavated material.

(c) Backfilling to Required Levels

The unit of measurement is the “cubic metre” of compacted volume of backfilling.

The volume for payment is the volume of backfilling to the levels shown on the Drawings, and guided by the principles shown in Figures B30/E.1 to B30/E.5. It excludes any backfilling due to over-excavation, and backfilling for any additional excavation necessitated by the construction method adopted, such as having to form temporary batters.

Ed 4 / Rev 1 11



The rate covers supply and placing of conforming backfill material, including compaction and testing.

Separate rates are provided for backfilling with:

(i) Select Fill

(ii) Earth fill (where backfilling with earth fill is not paid under RMS R44 but paid under B30)

(d) Additional Backfilling as Directed - Provisional Quantity

The unit of measurement is the “cubic metre”, measured as compacted volume of backfilling directed by the Principal. The quantity is a Provisional Quantity.

The volume for payment is determined by survey or manual measurement, and calculation.

The rate covers supply and placing of conforming backfill material, including compaction and testing.

Separate rates are provided for backfilling with:

(i) Select Fill

(ii) Earth fill (where backfilling with earth fill is not paid under R44 but paid under B30)

(e) Drainage Zone Behind Earth Retaining Structures

The unit of measurement is the “cubic metre” of volume of the drainage zone behind earth retaining structures, as shown on the Drawings or as indicated in Figures B30/E.1 to B30/E.4.

The rate includes all costs associated with the supply and placing of granular drainage material complying with Clause 6.2.4, geotextile, and corrugated perforated plastic subsurface drainage pipe.

(f) Mass Concrete Blinding Layer

The unit of measurement is the “cubic metre” of mass concrete blinding layer.

The quantity is calculated from the plan area of the blinding layer shown on the Drawings, multiplied by the thickness of the blinding layer.

This item covers all costs associated with the supply and placing of mass concrete blinding layer.

12 Ed 4 / Rev 0



ANNEXURE B30/C – SCHEDULES OF HOLD POINTS AND IDENTIFIED RECORDS

Refer to Clause 1.2.3.

C1 SCHEDULE OF HOLD POINTS

Clause Description

3 Submission of cofferdam and/or shoring details

4.4 Inspection of foundation prior to placing mass concrete blinding layer

C2 SCHEDULE OF IDENTIFIED RECORDS

The records listed below are Identified Records for the purposes of RMS Q Annexure Q/E.

Clause Description of Identified Record

6.2.1 Details of source, location, quantities and type of imported Select Fill.

ANNEXURE B30/D – PLANNING DOCUMENTS Refer to Clause 1.2.4.

The following documents are a summary of documents that must be included in the PROJECT QUALITY PLAN. The requirements of this Specification and others included in the Contract must be reviewed to determine additional documentation requirements.

Clause Description

3 Details of cofferdam and/or shoring.

3 Method of installation and removal of cofferdam.

6.4.4 Method of compaction of fill material located within 2 metres behind earth retaining structure.

Ed 4 / Rev 1 13



ANNEXURE B30/E – EXCAVATION, SELECT FILL AND DRAINAGE ZONE VOLUMES FOR MEASUREMENT AND PAYMENT PURPOSES

Notes: (1) The details shown above serves only to indicate the extent of the volumes of excavation, Select Fill backfill and drainage zone that are measured and paid for under

Annexure B30/B. These volumes are measured net, with no account taken in the measurement for payment of any additional excavation and backfilling necessitated by the construction method adopted, and the rates are deemed to have made due allowance for any additional excavation and backfilling so required.

(2) The actual details shown on the Drawings may differ from the details and dimensions shown above, in which case the details and dimensions shown on the Drawings take precedence over those shown above.

(3) The features other than the Select Fill backfill and drainage zone shown adjacent to the retaining structure serves merely to illustrate possible configurations in the finished works. The actual works required will be shown on the Drawings, and constructed in accordance with the relevant specifications.

Figure B30/E.1

Finished surface (shown for illustration purposes only)

H/2

H

Natural surface (shown for illustration purposes only)


Mass concrete blinding layer

300 mm

1000 mm

Excavation volume measured and paid for under Annexure B30/B Pay Item (a)

Select Fill volume measured and paid for under Annexure B30/B Pay Item (c)

Drainage zone volume measured and paid for under Annexure B30/B Pay Item (e)

Indicative extent of excavation (shown for illustration purposes only)


See Note (1) See Note (1)

LEGEND


14 Ed 4 / Rev 0







Figure B30/E.2


H/2

H Natural surface (shown for illustration purposes only)


1000 mm

300 mm Indicative extent of excavation (shown

for illustration purposes only)

Pavement

Upper Zone of Formation





See Note (1)

See Note (1)

LEGEND


Shown for illustration

purposes only

Footpath (shown for illustration purposes only)

Ed 4 / Rev 1 15







Figure B30/E.3

Pavement

H/2

Bridge superstructure


H

Pile

1000 mm

300 mm



Natural surface (shown for illustration purposes only) Indicative extent of excavation (shown for illustration purposes only)

Approach slab





See Note (1)

See Note (1)

LEGEND


Shown for illustration

purposes only

Shown for illustration purposes only

16 Ed 4 / Rev 0



Notes: (1) The details shown above serves only to indicate the extent of the volumes of Select Fill backfill and drainage zone that are measured and paid for under Annexure B30/B.

These volumes are measured net, with no account taken in the measurement for payment of any additional excavation and backfilling necessitated by the construction method adopted, and the rates are deemed to have made due allowance for any additional excavation and backfilling so required.



Figure B30/E.4

Pavement

H/2

Bridge superstructure

H Extent of wing wall (shown for illustration purposes only)

300 mm


Pile



Spill through bridge abutment fill material measured and paid for under RMS R44

LEGEND

See Legend

Approach slab

1000 mm Shown for

illustration purposes only

Shown for illustration purposes only


Ed 4 / Rev 1 17



Notes: (1) The details shown above serves only to indicate the extent of the volume of excavation that is measured and paid for under Annexure B30/B. The volume is measured net,

with no account taken in the measurement for payment of any additional excavation and backfilling necessitated by the construction method adopted, and the rates are deemed to have made due allowance for any additional excavation and backfilling so required.


(3) The features other than the earth fill backfill shown adjacent to the footing/pile cap serves merely to illustrate possible configurations in the finished works. The actual works required will be shown on the Drawings, and constructed in accordance with the relevant specifications.

Figure B30/E.5

Footing (Pilecap similar)

Pier column




Excavation volume measured and paid under Annexure B30/B Pay Item (a)

Earth fill complying with Clause 6.2.3

See Note (1) See Note (1)

LEGEND


18 Ed 4 / Rev 0



ANNEXURES B30/F TO B30/K – (NOT USED)

ANNEXURE B30/L – MINIMUM FREQUENCY OF TESTING Refer to Clause 1.2.5.

Clause Characteristic Tested Test Method Minimum Frequency of Testing

Select Fill

6.2.1 Chemical properties RMS T123, T1010, T1011

One per 500 m3

6.2.2 Particle size distribution and coefficient of uniformity

RMS T102, T106, T107

One per 500 m3

6.2.2 Plastic Index RMS T108, T109 One per 500 m3

6.4 Relative compaction RMS T119, T165, T166, T173

One per layer, or one per 100 m2, or one per day, whichever is more frequent

Earth Fill


One per 500 m3

6.2.3 Maximum particle dimension RMS T280 One per 500 m3

6.2.3 Particle size distribution and coefficient of uniformity

RMS T106, T107 One per 500 m3

6.4 Relative compaction RMS T119, T165, T166, T173

In accordance with RMS Q

Drainage Zone Material


One per 500 m3

6.2.4 Particle size distribution RMS T106 One per 500 m3

Ed 4 / Rev 1 19



ANNEXURE B30/M – REFERENCED DOCUMENTS Refer to Clause 1.2.6.

RMS Specifications

RMS G22 Work Health and Safety (Construction and Maintenance Works)

RMS G36 Environmental Protection

RMS G38 Soil and Water Management

RMS G71 Construction Surveys

RMS Q Quality Management System

RMS R44 Earthworks

RMS R63 Geotextiles (Separation and Filtration)

RMS 3552 Subsurface Drainage Pipe (Corrugated Perforated and Non-perforated Plastic)

RMS Test Methods

RMS T102 Pre-treatment of Road Construction Materials by Compaction

RMS T106 Coarse Particle Size Distribution of Road Construction Materials (by Dry Sieving)

RMS T107 Fine Particle Size Distribution of Road Construction Materials

RMS T108 Liquid Limit of Road Materials

RMS T109 Plastic Limit and Plasticity Index of Road Construction Materials

RMS T119 Field Density of Road Construction Materials (Sand Replacement Method)

RMS T120 Moisture Content of Road Construction Materials (Standard Method)

RMS T121 Moisture Content of Road Construction Materials (Sand Bath or Hot Plate Method)

RMS T123 Ph Value of a Soil (Electrometric Method)

RMS T165 Density In Situ of Road Construction Materials (Fixed Volume Extractive Method)

RMS T166 Relative Compaction of Road Construction Materials

RMS T173 Field Wet Density of Road Construction Materials (Nuclear Gauge in Direct Transmission Method)

RMS T180 Moisture Content of Road Construction Materials (Microwave Oven Method)

RMS T280 Determination of Maximum Particle Dimension of Road Construction Materials by Direct Measurement

RMS T1010 Quantitative Determination of Chlorides in Soil

RMS T1011 Quantitative Determination of Sulphates in Soil

RMS T2105 Correlation of Moisture Content with Standard Method

20 Ed 4 / Rev 0