211 1a Control of Erosion and Sedimentation

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The AUS-SPEC J oint Venture date: Feb 2002 Copying strictly prohibited

AUS-SPEC-2\NSW-211 Feb 2002 LIVERPOOLCITYCOUNCIL

SPECIFICATION 211 - CONTROL OF EROSION AND SEDIMENTATION

NOTICE

This document is a copy of one of Liverpool City Councils Infrastructure Specifications.

The Infrastructure Specifications have been developed by Council for use with civil works contracts let byCouncil, or for use on subdivision works to be handed over to Council.

Council only uses the Infrastructure Specifications in conjunction with its other standard form documentsand under the supervision of professional civil engineers who are trained and experienced in civil worksdelivery and construction. Liverpool City Council does not use these Specifications for any other purposeand does not consider them suitable for use for any other purpose.

If you use this document for any purpose which is not consistent with the above (including, without

limitation, for carrying out any construction, engineering, maintenance or other work) you do so at yourown risk.

Bound paper copies of Councils Specifications may be purchased on payment of the price published inCouncils list of Fees and Charges.

Electronic copies of LCC Specifications in editable format, generally will not be provided.

Electronic scanning, copying or decoding of Liverpool City Councils Specifications, is strictly prohibited.

This document is current at the date of this notice however, you should be aware that Liverpool CityCouncil regularly reviews and updates its Specifications. You will not be notified of any update.

Your comments and suggestions to improve any of Liverpool City Councils Specifications may be sentto:

The Manager City Assets Liverpool City CouncilLocked Bag 7064, LIVERPOOL BC NSW 1871

No advisory or support services other than those given in conjunction with specific Council tenders orSubdivision Construction projects, will be provided by Liverpool City Council.

Copyright in this document belongs to Liverpool City Council.


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Specification No. 211 CONTROL OF EROSION AND SEDIMENTATION



Amendment Record for th is Specif ication Part

This Specification is Councils edition of the AUS-SPEC generic specification part and includes Councilsprimary amendments.

Details are provided below outlining the clauses amended from the Council edition of this AUS-SPECSpecification Part. The clause numbering and context of each clause are preserved. New clauses are addedtowards the rear of the specification part as special requirements clauses. Project specific additional script isshown in the specification as italic font.

The amendment code indicated below is A for additional script M for modification to script and O foromission of script. An additional code P is included when the amendment is project specific.

AmendmentSequence No.

Key Topic addressed inamendment

Clause No. AmendmentCode

AuthorInitials

AmendmentDate

1.

When requested by theSuperintendent and added toclause to qualify exercise ofdiscretionary hold point

211.03 2. M AB 17.03.03

2.Clause renumbering 03.3 to03.3 (a)

211.03 3 (b). A AB 17.03.03

3.Council Supplied Detailsclause

211.03 3 (b). A AB 17.03.03

4.Deleted: flowing from areasof 0.5 hectares or more

211.11.1 O AB 17.03.03

5. MEASUREMENT ANDPAYMENTClause RESERVED

211.20 O AB 17.03.03

6.

7.

8.


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SPECIFICATION 211 - CONTROL OF EROSION AND SEDIMENTATION

CLAUSE CONTENTS PAGE

GENERAL .............................................................................................................................1

211.01 SCOPE..................................................................................................................................................1

211.02 REFERENCE DOCUMENTS................................................................................................................1

211.03 EROSION AND SEDIMENTATION CONTROL PLAN/SOIL AND WATER MANAGEMENT PLAN....2

211.04 EROSION AND SEDIMENTATION CONTROL MEASURES ..............................................................3

PERMANENT EROSION AND SEDIMENTATION CONTROL.............................................4

211.05 EARTHWORKS FOR PERMANENT EROSION AND SEDIMENTATION CONTROL BASINS..........4

211.06 INLETS, SPILLWAYS AND LOW FLOW OUTLETS FOR SEDIMENTATION CONTROL BASINSAND SEDIMENT TRAPS ......................................................................................................................4

211.07 DROP INLET SEDIMENT CONTROL ..................................................................................................4

211.08 CLEANING SEDIMENTATION CONTROL STRUCTURES.................................................................4

TEMPORARY EROSION AND SEDIMENTATION CONTROL ............................................5

211.09 GENERAL .............................................................................................................................................5

211.10 TEMPORARY DRAINS.........................................................................................................................5

211.11 TEMPORARY SEDIMENT TRAPS.......................................................................................................5

211.12 BATTER PROTECTION .......................................................................................................................6

211.13 MAINTENANCE AND INSPECTION ....................................................................................................6

211.14 REMOVAL .............................................................................................................................................6

SPECIAL REQUIREMENTS .................................................................................................6

211.15 RESERVED...........................................................................................................................................6

211.16 RESERVED...........................................................................................................................................6

211.17 RESERVED...........................................................................................................................................6

211.18 RESERVED...........................................................................................................................................6

211.19 RESERVED...........................................................................................................................................6


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CONTROL OF EROSION AND SEDIMENTATION Specification No. 211


AUS-SPEC-2\NSW-211 Feb 2002LIVERPOOLCITYCOUNCIL

MEASUREMENT AND PAYMENT .......................................................................................6

211.20 RESERVED...........................................................................................................................................6


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AUS-SPEC-2\NSW-211 Feb 2002 211-1 LIVERPOOLCITYCOUNCIL

SPECIFICATION 211CONTROL OF EROSION AND SEDIMENTATION

GENERAL

211.01 SCOPE

1. The work to be executed under this Specification consists of the construction ofstructures and the implementation of measures to control erosion and sedimentation inaccordance with the approved Erosion and Sedimentation Control Plan (ESCP) or Soiland Water Management Plan (SWMP) included in the Drawings. These may betemporary or permanent.

2. The Contractor shall plan and carry out the whole of the Works to avoid erosionand sedimentation of the site, surrounding country, watercourses, waterbodies andwetlands in compliance with the requirements of the Protection of the EnvironmentOperations Act, the Soil Conservation Act 1938, the Water Act 1912 and CouncilsAdopted Policies where available.

3. All measures for erosion and sedimentation control shall be designed, installedand maintained by the Contractor in such a manner so as not to present a potentialhazard to any person or property.

211.02 REFERENCE DOCUMENTS

1. Documents referenced in this Specification are listed in full below whilst beingcited in the text in the abbreviated form or code indicated.

DocumentsStandardsTest Methods

(a) Council Specifications

212 - Clearing and Grubbing213 - Earthworks224 - Open Drains, Including Kerb and Gutter273 - Landscaping

(b) NSW State Legislation

Protection of the Environment Operations Act, 1997Soil Conservation Act, 1938Water Act, 1912

(c) Other

NSW Department of Land and Water Conservation (DLWC)- Urban Erosion and Sediment Control.

NSW Department of Housing (DOH)- Managing Urban Stormwater, Soils and Construction,

3rd Ed., Aug 1998.Institute of Public Works Engineering Australia (IPWEA)

- Local Government Salinity Management Handbook (Draft,J uly 2001).


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211-2 AUS-SPEC-2\NSW-211 Feb 2002LIVERPOOLCITYCOUNCIL

211.03 EROSION AND SEDIMENTATION CONTROL PLAN/SOIL AND WATERMANAGEMENT PLAN

1. For implementation of the ESCP/SWMP, the site shall be divided into sectionsbased on the catchment area draining to each permanent drainage structure in theworks. In addition to the area bounded by the road reserve, the sections shall include:

Site Sections

(a) access and haulage tracks,

(b) borrow pits, stockpile areas and

(c) compound areas, such as Contractor's facilities and concrete batchingareas.

2. When requested by the Superintendent and at least seven days before thenatural surface is disturbed on each of these sections, the Contractor shall submit to theSuperintendent an ESCP/SWMP for that section. This Plan shall be superimposed onhalf-sized drainage drawings of the works and shall be detailed for each catchment area

of the works and be consistent with the approved ESCP/SWMP. This action constitutesa DISCRETIONARY HOLD POINT. The Superintendents approval of the submittedsection ESCP/SWMP is required prior to the release of the hold point.

Section Plan

DHP

3 (a). The Plan shall consist of scale diagrams indicating: PlanInclusions

(a) features of the site including contours and drainage paths,

(b) relevant construction details of all erosion and sedimentation controlstructures,

(c) all permanent and temporary erosion and sedimentation controlmeasures, including the control measures to be implemented in advanceof, or in conjunction with, clearing and grubbing operations as requiredunder the Specification for CLEARING AND GRUBBING.

(d) an order of works based upon construction and stabilisation of allculverts and surface drainage works at the earliest practical stage, and

(e) proposed time schedules for construction of structures andimplementation of measures to control erosion and sedimentation.

3 (b). Where council provides erosion and/or sedimentation control plans or details,these must be incorporated into the above plan and supplemented with any of the aboverequirements as necessary.

CouncilSuppliedDetails

4. The DLWC publication Urban Erosion and Sediment Control and the DOH

publication Managing Urban Stormwater, Soils and Construction provides guidance ontypical permanent and temporary erosion and sedimentation control measures whichmay be required and guidance in the preparation of an ESCP/SWMP.

Guidance

5. In known salt affected areas, the Contractor shall seek advice from the relevantland and water resource authority to ensure that its Erosion and Sedimentation ControlPlan conforms with the current salinity prevention measures outlined in the IPWEApublication, Local Government Salinity Management Handbook.

SalinityPrevention

6. Release of the hold point approving the section ESCP/SWMP as submitted shallnot relieve the Contractor of the full responsibility to provide whatever measures arerequired for effective erosion and sedimentation control at all times.

Contractor'sResponsibility

7. The Contractor shall adhere to the approved ESCP/SWMP. The Contractor shallsubmit a revised ESCP/SWMP for approval by the Superintendent seven days in

Adherence toPlan


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AUS-SPEC-2\NSW-211 Feb 2002 211-3 LIVERPOOLCITYCOUNCIL

advance of an intended variation from the approved plan.

8. The cost of preparing, submitting and revising the ESCP/SWMPshall be borne bythe Contractor.

Contractor'sCost

211.04 EROSION AND SEDIMENTATION CONTROL MEASURES

1. Erosion and sedimentation control measures shall include, but shall not belimited to, the following:

Scope

(a) The installation of permanent drainage structures before the removal oftopsoil and commencement of earthworks for formation within thecatchment area of each structure.

(b) The prompt completion of all permanent and temporary drainage works,once commenced, to minimise the period of exposure of disturbed areas.

(c) The stabilisation of diversion and catch drains to divert uncontaminatedrunoff from outside the site, clear of the site. Catch drains shall beinstalled and lined, as approved by the Superintendent, before the

adjacent ground is disturbed and the excavation is commenced.

(d) The passage of uncontaminated water through the site without mixingwith contaminated runoff from the site.

(e) The provision of contour and diversion drains across exposed areasbefore, during and immediately after clearing and the re-establishmentand maintenance of these drains during soil removal and earthworksoperations.

(f) The provision of sediment filtering or sediment traps, in advance of andin conjunction with earthworks operations, to prevent contaminated waterleaving the site.

(g) The restoration of the above drainage and sedimentation control works

on a day to day basis to ensure that no disturbed area is left withoutadequate means of containment and treatment of contaminated water.

(h) The limitation of areas of erodible material exposed at any time to thoseareas being actively worked. Any area that is not approved by theSuperintendent for clearing or disturbance by the Contractors activitiesshall be clearly marked, fenced off or otherwise appropriately protectedagainst any such disturbance.

(i) The minimisation of sediment loss during construction of embankmentsby means such as temporary or reverse superelevations during fillplacement, constructing berms along the edge of the formation leadingto temporary batter flumes and short term sediment traps.

(j) The progressive revegetation of the site, in accordance with theSpecification for LANDSCAPING, as work proceeds.

(k) All stockpile sites shall be situated in areas approved for such use by theSuperintendent. A 5m buffer zone shall exist between stockpile sitesand any stream or flow path. All stockpiles shall be adequately protectedfrom erosion and contamination of the surrounding area by use of themeasures approved in the Erosion and Sedimentation Control Plan

(l) Access and exit areas shall include shake-down or other methodsapproved by the Superintendent for the removal of soil materials frommotor vehicles.

2. All permanent and temporary erosion and sedimentation control measures shallbe constructed in accordance with the construction details in the ESCP/SWMP and thedetails as shown on the Drawings.


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PERMANENT EROSION AND SEDIMENTATION CONTROL

211.05 EARTHWORKS FOR PERMANENT EROSION AND SEDIMENTATIONCONTROL BASINS

1. Earthworks for permanent erosion and sedimentation control basins shall beconstructed to the planned levels and dimensions shown on the Drawings or such levelsand dimensions as determined by the Superintendent.

PlannedLevels

2. The entire storage and embankment foundation area of permanent erosion andsedimentation control basins shall be cleared in accordance with the Specification forCLEARING AND GRUBBING and shall be stripped of topsoil and any unsuitable materialunder embankments removed in accordance with the Specification for EARTHWORKS.

SitePreparation

3. The embankments shall be constructed in accordance with the Specification forEARTHWORKS.

CompactionRequirements

4. Where payment for embankment construction is on a Schedule of Rates basis, atleast three days before construction of the embankment the Contractor shall provide theSuperintendent with survey information which will be sufficient to subsequently measurethe volume of the constructed embankment.

Contractor toProvideSurveyInformation

211.06 INLETS, SPILLWAYS AND LOW FLOW OUTLETS FOR SEDIMENTATIONCONTROL BASINS AND SEDIMENT TRAPS

1. Inlets and spillways shall be constructed using rock filled woven galvanised steelmattresses and geotextile, as shown on the Drawings or as directed by theSuperintendent. The rock filled mattresses shall be installed in accordance with therequirements for rock filled wire mattress and geotextile in the Specification for OPEN

DRAINS, INCLUDING KERB AND GUTTER.

RockMattresses

2. A low flow outlet consisting of a 150mm diameter plastic pipe shall be installedas shown in the Drawings. No extra payment shall be made for this work which shall beregarded as part of the construction of the sedimentation control basin.

Plastic PipeOutlet

211.07 DROP INLET SEDIMENT CONTROL

1. Permanent drop inlet sediment traps and inlet control banks shall be constructedon completion of gully pits as indicated on the Drawings. These permanent drop inletsediment traps and inlet control banks are additional to the temporary sedimentationcontrol measures that may be required under Clause 211.10 during construction of the

gully pits.

PermanentTraps

2. The drop inlet sediment traps are intended to remove sediment from the surfaceflow before it enters the drainage system. The inlet control banks shall be constructed asrequired to prevent the surface flows bypassing the gully pits.

Purpose

3. The drop inlet sediment traps shall be constructed as shown on the Drawings.The associated inlet control banks shall consist of at least two courses of sandbagscontaining a 10:1 sand/cement mix. The bags shall be keyed at least 25mm into thesurface, dampened sufficiently to ensure hydration of the cement and tamped lightly toprovide mechanical interlock between adjacent bags.

Control Banks

211.08 CLEANING SEDIMENTATION CONTROL STRUCTURES

1. The Contractor shall clean out permanent sedimentation control structures, Contractor's


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remove sediment from sediment-laden runoff before the runoff enters stormwaterdrainage systems, natural watercourses or adjacent land.

Traps

211.12 BATTER PROTECTION

1. The Contractor shall take all necessary action to protect batters from erosionduring the Contract.

Contractor's

Responsibility

2. Scour of newly-formed fill batters during and after embankment construction shallbe minimised by diverting runoff from the formation away from the batter until vegetationis established.

Scour Control

211.13 MAINTENANCE AND INSPECTION

1. The Contractor shall inspect all temporary erosion and sedimentation controlworks after each rain period and during periods of prolonged rainfall. Any defectsrevealed by such inspections shall be rectified immediately and these works shall becleaned, repaired and augmented as required, to ensure effective erosion andsedimentation control thereafter.


2. The Contractor shall provide and maintain access from within the road reserve orfrom other locations acceptable to the Superintendent, for cleaning out sedimentationcontrol works.

Access

211.14 REMOVAL

1. All temporary erosion and sedimentation control works shall be removed by theContractor when revegetation is established on formerly exposed areas before the end ofthe Contract. All materials used for the temporary erosion and sedimentation controlworks shall be removed from the site or otherwise disposed by the Contractor to thesatisfaction of the Superintendent.


SPECIAL REQUIREMENTS

211.15 RESERVED

211.16 RESERVED

211.17 RESERVED

211.18 RESERVED

211.19 RESERVED

MEASUREMENT AND PAYMENT

211.20 RESERVED

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