Erosion and Sediment Control Report - Mackay Council · Upon completion of the bulk earthworks...

LOT 5 SARINA BEACH ROAD

Erosion and Sediment Control Report

Project Number: 249803

DATE: February 2013 Prepared for LANCE STEINDL

Lot 5 Sarina Beach Road


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Cardno (Qld) Pty Ltd

ABN 57 051 074 992

Level 1, 9 Maud Street

Maroochydore Qld 4558

PO Box 152

Maroochydore Qld 4558

Telephone: 07 5443 2555

Facsimile: 07 5443 5642

[email protected]

www.cardno.com.au

Document Control:

Version Date Author Reviewer

Name Initials Name Initials

1 February 2013 Paul McKay PMc Tony Howard TH

"© 2013 Cardno All Rights Reserved. Copyright in the whole and every part of this document belongs to

Cardno and may not be used, sold, transferred, copied or reproduced in whole or in part in any manner or

form or in or on any media to any person without the prior written consent of Cardno.”



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TABLE OF CONTENTS

1 SITE EROSION AND SEDIMENT HAZARD 1

1.1 PROPOSED DEVELOPMENT SITE 1

1.2 HYDROLOGIC IMPACT 1

1.3 SITE PHYSICAL CHARACTERISTICS CONSTRAINTS AND OPPORTUNITIES 1

1.4 EROSION HAZARD ASSESSMENT 2

1.5 SPECIAL CONSIDERATIONS 3

1.6 RAINFALL HAZARD 4

2 EROSION AND SEDIMENT MANAGEMENT 5

2.1 METHODOLOGY 5

2.2 GENERAL 5

2.3 LAND CLEARING 5

2.4 SITE ACCESS 6

2.5 SOIL AND STOCKPILE MANAGEMENT 6

2.6 ESC INSTALLATION SEQUENCE 7

2.7 STATE PLANNING POLICY – HEALTHY WATERS 8

2.8 REGIONAL VEGTATION MANAGEMENT CODE 9

2.9 URBAN STORMWATER PLANNING GUIDELINES 10

2.10 INTERNATIONAL EROSION CONTROL ASSOCIATION 11

3 EROSION AND SEDIMENT CONTROL DEVICES 12

3.1 SEDIMENT FENCES 12

3.2 MESH AND GRAVEL INLET FILTER 12

3.3 SURFACE ROUGHENING 13

3.4 ROCK CHECK DAMS 13

3.5 SEDIMENT BASINS – WET TYPE 13

3.6 CATCH DRAINS AND PERIMETER BANKS 13

3.7 MULCHING / REVEGETATION 13

3.8 FILTER DAMS 13

4 SEDIMENT BASIN 14

4.1 MATERIALS 14

4.2 CONSTRUCTION 14

5 DRAINAGE CONTROL DEVICES 17

5.1 CATCH DRAIN 17

5.2 DIVERSION CHANNEL 17

5.3 SLOPE DRAIN 17

5.4 LEVEL SPREADER 17



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5.5 OUTLET STRUCTURE 17

6 EROSION AND SEDIMENT CONTROL PHASING 18

6.1 PHASE 1 – PRIOR TO COMMENCEMENT OF EARTHWORKS 18

6.2 PHASE 2 – BULK EARTHWORKS 18

6.3 PHASE 3 - CIVIL CONSTRUCTION 18

6.4 PHASE 4 – POST CONSTRUCTION 18

7 MAINTENANCE AND MANAGEMENT 19

7.1 MAINTENANCE CONSIDERATIONS 19

7.2 SITE MANAGEMENT 19

7.3 SITE MAINTENANCE 20

7.4 MAINTENANCE PROGRAM 20

7.5 POST CONSTRUCTION 20

7.6 EROSION AND SEDIMENT CONTROL PLAN REVIEW 21

7.7 SITE MONITORING 21

8 SITE REHABILITATION 22

8.1 SEDIMENT BASIN REHABILITATION 22

APPENDICES:

APPENDIX A EROSION HAZARD ASSESSMENT

APPENDIX B INSPECTION AND TEST PLAN

APPENDIX C NON-CONFORMANCE REPORT

APPENDIX D CONSTRUCTION CHECKLISTS

APPENDIX E MAINTENANCE CHECKLISTS

APPENDIX F CONCEPTUAL EROSION AND SEDIMENT CONTROL PLANS



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EXECUTIVE SUMMARY

A 20 lot rural residential subdivision is proposed at Lot 5 Sarina Beach Road for Mr Lance Steindl.

This report has been prepared to set out potential drainage, erosion and sediment control techniques for the subject site. The techniques and methodology set out herein are to ensure that the future construction on the site may be undertaken in such a manner as to ensure that adequate protection for the site and downstream areas, from sediment contaminated runoff, can be achieved. This report is meant as a management report only, with the detailed design and contractor’s construction management plan, establishing the final controls and methodology intended for use on the site.

This report is to be read in conjunction with all relevant plans and reports for the site and the relevant statutory approvals for the site.

Paul McKay

CPESC



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1 SITE EROSION AND SEDIMENT HAZARD

Where practical, the soil erosion hazard is to be kept as low as possible at all times.

1.1 PROPOSED DEVELOPMENT SITE

Lance Steindl intends to develop Lot 5 on RP 807990 Sarina Beach Road, Sarina Beach, into a 20 lot rural residential subdivision.

The site is on vacant, unimproved land and is bounded by the Sarina Inlet to the south and Sarina Beach Road to the north.

1.2 HYDROLOGIC IMPACT

1.2.1 External Catchment

Only a very minor catchment north of Sarina Beach Road enters the site via existing cross road culvert drainage. It is not proposed to interfere with or alter these culverts, or their respective discharge locations as part of the proposed development works.

These external catchments discharge into existing overland flow paths and are to be maintained in the current location and condition.

Clean water diversions are proposed to be installed to direct these external catchments around and through the prospective works area.

1.2.2 Internal Drainage Paths

The undulating nature of site directs on-site stormwater runoff into natural gullyies and overland flow paths. As far as is practical, these natural flow lines are to be remain, within the current development proposal. All site works areas are to be controlled by cut-off drains, bunds and silt fences to direct flows to the proposed sediment basins.

Clean water diversions are proposed to be installed to convey internal catchments through the prospective works area.

1.2.3 Site Discharge

Stormwater discharge from the works area, for the design rainfall event capacity of the proposed sediment basins, is proposed to be retained on site, up to the 5 day 80

th percentile rainfall event.

Rainfall events exceeding this will still be treated by the sediment basin, but to a lesser degree, prior to discharge. The erosion control measures implemented on site will minimise as far is reasonable and practial the potential for contaminated runoff exiting the site.

1.2.4 Receiving Environment

The site works areas drain to Sarina Inlet and natural wetland areas of high significance.

1.3 SITE PHYSICAL CHARACTERISTICS CONSTRAINTS AND OPPORTUNITIES

The site constraints lie primarily with the proximity to the wetland area and Sarina Inlet to the south and the undulation of the terrain. Sufficient erosion and sediment controls, along with appropriate drainage management, will mitigate potential sediment impacts as far as practicable.



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1.4 EROSION HAZARD ASSESSMENT

The following hazard factors have been considered in preparing the Soil Erosion and Sediment Control Plans. Refer to Appendix A for an Erosion Hazard Assessment completed for the project. The site is considered a high risk, from an erosion hazard perspective, and the area of disturbed ground is significant enough to warrant appropriate drainage, erosion and sediment controls to mitigate the potential impact of the earthworks on the site.

All soil data used for preliminary sediment basin calculation design has been derived from the International Erosion Control Associations Best Practice Erosion and Sediment Control Guideline.

The Soil Loss class for the site is High (501 to 740 t/ha/yr) (refer Table 1 below). Calculated soil loss using the RUSLE equation equals approximately 714t/ha/yr.

Table 1: Soil Loss Class

Soil Loss

Class

Calculated Soil

Loss

(t/ha/yr)

Erosion Hazard

1 0 to 150 Very Low

2 151 to 225 Low

3 226 to 350 Low-Moderate

4 351 to 500 Moderate

5 501 to 750 High

6 751 to 1,500 Very High

7 >1,500 Extremely High

The above table is taken directly from Table 3.1 Soil Loss Classes, Chapter 3 of the IECA Best Practice Erosion and Sediment Control 2008.

1.4.1 Slope

The topography of the site works area varies from relatively flat (0 – 5%) to steep (20 – 25%). With the formation of the area into the proposed rural residential estate, cut off drains and swales will be established to direct contaminated runoff to the established sediment basins. All slopes are to be maintained to lengths well less than 30m to minimise velocity generation by stormwater runoff and the potential to pick up and move soil across the site. Within the eastern portion of the site that leads up to the cul-de-sac regular cut-off drain turnouts and check dams are to be used within the contaminated water cut off drains to manage velocities.



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1.4.2 Duration of Disturbance

It is proposed that the construction program is to be sequenced.

Upon completion of the bulk earthworks areas, the site will be progressively stabilised as recommended herein and inspected by the Superintendent / Site Engineer.

It is intended to fill the site by a cellular means, to minimise the potential for exposed soils to produce sediment laden runoff. It is proposed to construct the outer limit of the earthworks fill area first and to stabilise this outer bank immediately upon completion. With the internal face sloping back into the works areas. This bund will contain all contaminated runoff within the site works area itself, which will then be directed to the proposed sediment basins for treatment prior to discharge.

1.4.3 Rehabilitation Method

The finished surface of the estate will be rehabilitated according to its location and intended final use. All batters are generally to be prepped, mulched and vegetated. Verge areas are to be turfed

All future building pad areas are to be cleared once the civil works is essentially complete. The house site areas and firebreak zones are to be cleared by means of excavator mounted mulching equipment, with all mulch material to be spread evenly over the cleared areas to prevent raindrop impact and erosion of the respective home sites.

Prior to the placement of any topsoil to earthworks areas, the surface is to be scarified/roughened along the contour.

Topsoil is only to be moved when it is in a damp condition to ensure that the soil aggregate condition is maintained. Topsoil is to be ripped/scarified along the contour prior to seeding, if smooth and compacted.

It is intended that any seeded areas are to be covered immediately with hydromulch or mulch fibre upon finalisation.

1.5 SPECIAL CONSIDERATIONS

A specific site issue to be considered is the proximity to the adjacent wetland area and the areas of vegetation within the site. Fences are to be erected at the extent of the proposed earthworks areas and clearly marked as “No Go Zones” beyond.

The areas to be cleared for house site and firebreaks are to be similarly marked out prior to clearing commencing.

Access for construction movements will only be permitted via Sarina Beach Road at the designated location.



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1.6 RAINFALL HAZARD

The site is located at Sarina Beach and the works are still to be designed and tendered for construction. Appropriate measures have been included within the attached Conceptual Erosion and Sediment Control Plans to assist in the mitigation of the potential hazard associated with carrying out works.

Table 2: Erosion Risk Identification Chart

Location Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Mackay E E H H M M VL VL VL M M H

It is proposed that all reasonable and practicable steps are to be taken to apply appropriate best practice erosion and sediment control measures to the civil works construction.

Prior to anticipated rainfall events, the works are to be stabilised/covered/protected to minimise the potential contamination of runoff from the disturbed areas of the site. All erosion and sediment control measures on the site are to be inspected to ensure they are complete and fully operational, prior to and after rainfall events.

Table 3: Erosion Risk based on monthly rainfall erosivity

Erosion risk Rating Average monthly erosivitiy (R – factor)

Very Low 0 to 60

Low 60+ to 100

Moderate 100+ to 285

High 285+ to 1500

Extreme >1500

The above table is taken directly from Table G2 Erosion Risk Rating, based on monthly rainfall erosivity, Appendix G of the IECA Best Practice Erosion and Sediment Control 2008.

Table 4: Monthly erosivity (R factor) values

Location Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Mackay 2142 1875 1275 445 193 126 59.3 44.5 51.9 133 237 830

The above table is taken directly from Table E1 Monthly and Annual Rainfall Erosivity (R-factor) Values, Appendix E of the IECA Best Practice Erosion and Sediment Control 2008.

Based upon the above tables it is preferred that the work be carried out between the months of May and November and, ideally, all earthworks are to be completed in the months July, August and September.



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2 EROSION AND SEDIMENT MANAGEMENT

2.1 METHODOLOGY

The proposed erosion and sediment control methodology is to be implemented in four distinct phases, in accordance with construction activities being undertaken.

Phase 1 – Prior to Construction commencement

Phase 2 – Bulk Earthworks

Phase 3 – Civil Construction

Phase 4 – Post Construction

Sediment basins are to be established, as indicated on the attached Erosion and Sediment Control Plans, prior to works commencing in the basins catchment area.

The site is to be filled in a cellular fashion, in that the external fill batters are to be filled and stabilised first, prior to the infilling of the fill areas. The entire earthworks area will be managed by the Contractor in a logical and reasonable sequence.

Topsoil management is critical in the overall strategy for carrying out earthworks over the site. It is proposed only to strip those areas immediately required to be cut or filled and to place stripped topsoil into long, low, flat mounds to retain the seed and organism life. Topsoil is only ever to be transported in a damp condition and is to be re-placed on a roughened surface. Topsoil is to be placed back to a final depth of 200mm, or as otherwise directed, and left in a roughened condition and immediately seeded / hydromulched / mulched / turfed, as appropriate.

Dust control of the site is to be maintained at a level to ensure there are no visible dust emissions from the site during earthworks and construction activities.

2.2 GENERAL

Additional erosion and sediment control measures will be implemented and a revised Erosion and Sediment Control Plan (ESCP) proposed, in the event that site conditions and scope of works change significantly from those considered within this ESCP.

Where there is a high probability that serious or material environmental harm may occur as a result of sediment leaving the site, appropriate additional erosion and sediment control measures must be implemented, such that all reasonable and practicable measures are being taken to prevent or minimise environmental harm.

2.3 LAND CLEARING

No land clearing shall be undertaken unless preceded by the installation of adequate drainage and sediment control measures, unless such the clearing is required for the purpose of installing these measures, in which case, only the minimum clearing required to install the measures shall occur.

Prior to land clearing, areas of protected vegetation, and significant areas of retained vegetation, must be clearly identified (e.g. with high-visibility tape, or light fencing) for the purposes of minimising the risk of unnecessary land clearing.

All reasonable and practicable measures will be taken to minimise the removal of, or disturbance to, those vegetated areas that are intended to be retained.

All land clearing must be in accordance with the Federal, State and Local Government Vegetation Protection/Preservation requirements and/or policies.



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2.4 SITE ACCESS

Prior to the commencement of site works, the location of the site access point must be established. Site access will be limited to a constructed stabilised access entry / exit from Sarina Beach Road.

The site exit point is to be monitored and maintained to minimise sediment being tracked onto sealed, public roadways. Stormwater runoff from access roads and the stabilised entry/exit point is to be directed to on-site sediment control devices.

2.5 SOIL AND STOCKPILE MANAGEMENT

All reasonable and practicable measures must be taken to obtain the maximum benefit from existing topsoil. Viable topsoil is to be stockpiled in long, low, flat mounds to facilitate the survival of seed and micro-organisms vital for the topsoil.

Stockpiles of erodible material that has the potential to cause environmental harm, if displaced, must be:

Appropriately protected from wind, rain, concentrated surface flow and excessive up-slope stormwater surface flows.

Located at least 2m from any hazardous area, retained vegetation, or concentrated drainage line.

Located up-slope of an appropriate sediment control system.

Provided with an appropriate protective cover (synthetic, mulch or vegetative) if the materials are likely to be stockpiled for more than 28 days.

A suitable flow diversion system must be established immediately up-slope of a stockpile of erodible material that has the potential to cause environmental harm, if displaced, and if the up-slope catchment area draining to the stockpile exceeds 1500m

2.



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2.6 ESC INSTALLATION SEQUENCE

Table 5: Erosion and sediment control sequence

Prior to land disturbance

Item Removed

Mark out initial limits of disturbance / mark out No Go

Zones

Entry / Exit installed Upon site completion

Clear site office, sediment basin and stockpile areas

Install sediment fence to stockpile areas After stockpile removal

Install site office Upon site completion

Install Sediment Basins and stabilised outlets Upon site completion

Construct clear water diversions Upon site completion

During earthworks operations

Item Removed

Install cut off drains and diversion banks for dirty water

collection

Upon site establishment completion, cover 75%

Clear staged works area

Strip topsoil to stockpile and provide flow controls and

downstream filter fence

Carry out earthworks, profile and topsoil

Mulch / seed / turf completed staged earthworks

embankment areas immediately upon completion

Stabilise allotments / earthworks area with appropriate

measures

Install mulch berms / silt fences / contour banks to

manage sheet flow lengths

Upon site establishment completion, cover 75%

During civil works operations

Item Removed

Install pipework and pits

Pit inlet protection installed as required

Construct road ways and kerb and channel

Install kerb inlet protection Upon site establishment completion, cover 75%

Install grass strips to back of kerb / path areas

Install end of pipe sediment device



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2.7 STATE PLANNING POLICY – HEALTHY WATERS

Appendix 1 of the State Planning Policy 4/2010 – Healthy Waters is reproduced, in part, below.

Only those specific Performance Outcomes of the Development Assessment Code relevant to

Erosion and Sediment Control of the proposed works have been addressed.

Table 6: State planning policy compliance

Part A Urban Stormwater Management - Protecting Water Quality

Performance Outcomes Acceptable Measures Demonstrated Compliance

PO3

Construction activities for the

development avoid or

minimise adverse impacts on

stormwater quality.

AO3.1

Any development application for the

development is accompanied by an erosion

and sediment control plan (ESCP)

prepared in accordance with the guideline

that demonstrates release of sediment

laden stormwater is avoided for the

nominated design storm, and minimised

when the nominated design storm is

exceeded by addressing design objectives

in the guideline, Chapter 4, for:

drainage control;

erosion control;

sediment control; and

water quality outcomes.

Addressing the design objectives may

include enhancing the achievement of

some objectives if achievement of other

objectives is impractical.

And

AO3.2

Erosion and sediment control practices

including any proprietary erosion and

sediment control products are design,

installed, constructed, operated, monitored

and maintained, and any other erosion and

sediment control practices carried out, in

accordance with local conditions and

appropriate recommendations from a

suitably qualified person.

Or

The ESCP demonstrates how stormwater

quality will be managed in accordance with

an acceptable regional or local guideline so

that target contaminants are treated to a

design objective at least equivalent to

Acceptable Outcome AO3.1.

Timing.

Works are only to be undertaken

during periods of dry weather and

ideally as noted in section 1.6.

Works are to be undertaken in a

progressive manner in that only

the necessary area for immediate

construction works is to be

cleared.

Sequencing.

Works are to follow orderly

sequence in terms of clearing,

construction works and

revegetation to occur sequentially

as areas are opened up,

constructed and established.

Drainage controls.

Drainage controls are paramount

in terrain as per this proposal.

Upstream clean water diversions

are to be in place and stable at all

times. Contaminated water

diversions are to be progressively

established as works are

progressed.

Erosion Controls.

Area of works left open at any

one time is to be minimised. Site

works are to be covered and / or

protected before forecast rainfall

events. Site areas are to be

stabilised as soon as practical

upon completion.

Sediment Controls.

Two sediment dams are proposed

for the site. Sediment fences,

mulch bunds and cut off drains

are required as works areas are

commenced.



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Clearing.

All clearing is to occur to

nominated areas only. Clearing of

house sites is to be undertaken

by excavator mounted mulching

equipment or similar.

2.8 REGIONAL VEGTATION MANAGEMENT CODE

Part P of the Regional Vegetation management Code for Coastal Bioregions – version 2 is

reproduced, in part, below. Only those specific Performance Outcomes of the Code relevant to

Erosion and Sediment Control of the proposed works have been addressed.

Table 7: Regional vegetation management code compliance

Part P: Requirements for clearing for Public Safety and Infrastructure

Performance Requirement Acceptable Solution Demonstrated Compliance

PR P.5: Soil Erosion

To regulate the clearing of

vegetation in a way that does not

cause land degradation and

maintains ecological processes –

the effect of clearing does not result

in –

a) Mass movement, gully erosion,

rill erosion, sheet erosion, tunnel

erosion, stream bank erosion,

wind erosion, or scalding; and

b) Any associated loss of

chemical, physical or biological

fertility – including but not

limited to water holding

capacity, soil structure, organic

matter, soil biology, and

nutrients, within and/or outside

the lot(s) that are the subject of

the application.

AS P.5

P.5.1

Mechanical clearing only occurs on

–

a) Stable soils on a slope less than

30%; and

b) Unstable soils on a slope less

than 10%; and

c) Very unstable soils on a slope

less than 1%.

All clearing is to occur to nominated

areas only.

Only those areas required for

immediate works are to be cleared

at any one time.

Clearing of house sites is to be

undertaken by excavator mounted

mulching equipment or similar.

Mulched material is to be spread

over cleared area to protect house

area site from erosion.



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2.9 URBAN STORMWATER PLANNING GUIDELINES

Water quality objectives for the purpose of this report have been derived from Table 2.1 of the

Urban Stormwater Quality Planning Guideline, December 2010, by the Department of

Environment and Resource Management. Table 2.1 is reproduced in part below.

Table 8: Construction Phase stormwater design objectives

Drainage Control Design life and design storm of temporary drainage works:

Disturbed area open for< 12 months – 1 in 2 ARI

Erosion Control 1. Minimise exposure of disturbed soils at any time

2. Avoid or minimise large construction activities in the wet season

3. Divert water run-off from undisturbed areas around disturbed areas

Use erosion risk ratings to determine appropriate erosion control measures

Sediment Control Use soil loss rates to determine appropriate sediment control measures

Design storm for sediment control basins should be based on retaining the

maximum sediment quantity for the maximum volume of water runoff. (5

day 80th percentile nominated)

Site discharge during sediment basin dewatering should not exceed

50mg/L TSS and pH between 6.5 – 8.5

Water Quality

Outcomes

Stormwater flows from undisturbed and disturbed areas – managed to help

protect environmental values

Coarse Sediment – coarse sediment is retained on site

Fine Sediment – Site discharge during sediment basin dewatering has a

TSS concentration less than 50mg/L

Turbidity – Site discharge during sediment basin dewatering has a turbidity

(NTU) less than 10% above receiving waters turbidity – measured

immediately upstream of the site

pH – Site discharge during sediment basin dewatering has a pH range 6.5-

8.5

Stormwater

drainage/flow

management

Hydraulics and hydrology – Take all reasonable and practicable measures

to minimise significant changes to the natural waterway hydraulics and

hydrology

Proposed sediment basins are designed to cater for the five-day rainfall depth 80th percentile

storm depth (design storm event) for Type D or F soils.



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2.10 INTERNATIONAL EROSION CONTROL ASSOCIATION

Refer to the International Erosion Control Association – Best Practice Erosion and Sediment

Control guideline for additional technical support, standard drawings, specification information

and management methods.



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3 EROSION AND SEDIMENT CONTROL DEVICES

All necessary erosion and sediment control measures must be applied and maintained.

The application of liquid-based dust suppression measures must ensure that sediment-laden runoff resulting from such measures does not create a traffic or environmental hazard.

All temporary earth banks, flow diversion systems, and embankments associated with constructed sediment basins must be machine-compacted, seeded and mulched for the purpose of establishing a temporary vegetative cover within 10 days after grading.

Unprotected slope lengths must not exceed 30m, or an equivalent vertical fall of 3m.

Optimum benefit must be made of every opportunity to trap sediment within the work site, and as close as practicable to its source. Sediment traps must be installed and operated to both collect and retain sediment.

The potential safety risk of a proposed sediment trap to site workers and the public must be given appropriate consideration, especially those devices located within publicly accessible areas.

Suitable all-weather maintenance access must be provided to all sediment control devices.

Materials, whether liquid or solid, removed from sediment control devices during maintenance or decommissioning, must be disposed of in a manner that does not cause ongoing soil erosion or environmental harm.

Constructed sediment basins must be maintained and fully operational throughout the construction period and until the basin catchment area achieves 75% ground cover on all soil surfaces.

Settled sediment must be removed from the sediment basin when the volume of the sediment exceeds the designated sediment storage volume, or the design maximum sediment storage elevation.

The following devices are proposed to be used during the construction of the proposed works and are from the International Erosion Control Association Best practice Erosion and Sediment Control Manual 2008.

3.1 SEDIMENT FENCES

Sediment fences are to be constructed to follow the contours of the site as closely as possible.

3.2 STABILISED SITE ACCESS

Stabilised site access is to have the topsoil removed and the area levelled and compacted. The access is to have geotextile placed and a minimum 200mm thick rock gravel layer placed over. The structure must be at least 15m long and 3m wide. A hump within the rock blanket may be required where there is the risk of site flows exiting over the access and onto streets. As an alternative to the above, a cattle grid may be installed to vibrate loose material from vehicles exiting the site. The grid must be set up with sufficient gap underneath to allow capture of loose sediment and must be periodically cleaned out.

3.3 MESH AND GRAVEL INLET FILTER

A gravel filled, mesh sock is placed in front of kerb inlet pits, with a spacer behind, to ensure the sock is not pushed into the pit inlet and potentially blocking off the inlet. To be considered in the use of this type of inlet protection is the potential of runoff diversion and the impact bypass flows may have on the drainage system and overland flowpaths.



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3.4 SURFACE ROUGHENING

Tracking or ripping to roughen the surface of soils exposed to raindrop impact can greatly reduce the risk of minor rainfall events producing runoff and removing sediment from the site. Using a tracked machine, walk up and down the slope of the fill area, with the cleats leaving impressions in the surface parallel to the contour, or, alternatively ,ripping along the contour may be considered.

3.5 ROCK CHECK DAMS

Rock check dams will generally consist of large rock rubble weirs, with a trough in the centre to maintain flows in the drain. The check dams will allow trickle flows through the structure, with the intention that sediment and suspended particles will drop out before exiting the drain.

3.6 SEDIMENT BASINS – WET TYPE

Sediment basins are proposed to be constructed with the commencement of works on the site. The sediment basins are to be wet type basins. The basin is to have a specifically sized spillway to be constructed and armoured with rock rubble, overlaying a geotextile layer. The spillway for each of the sediment basins has been sized for the Q10 flow event. Sediment basin flocculation will be undertaken and carried out in accordance with the manufacturer’s specifications, as and when required. Any retained water may be reused on site for construction purposes. Sediment material deposited in the sediment basin is to be dried out and mixed into site soils and used as fill.

3.7 CATCH DRAINS AND PERIMETER BANKS

Catch drains and perimeter banks will be used, where required, to divert flow around unstable areas and stockpiles. The drains may also be used to limit the flow path length down steep grades or unstable or newly grassed areas.

3.8 MULCHING / REVEGETATION

All batters and significant slopes not being turfed are to be mulched and planted, or other alternative covering treatment applied, as approved by the superintendent, immediately after final formation.

3.9 FILTER DAMS

A filter dam consists of a large rock rubble weir, faced on the upstream side with 20-30mm screenings. The weir will allow trickle flows through the structure, with the intention that sediment and suspended particles will bind to the screenings and/or drop out before exiting the site and entering the creek line proper. A type C soil sediment basin, however, this detail on a smaller scale for use in drainage channels and swales is very effective in removing coarse sediment.



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4 SEDIMENT BASIN

4.1 MATERIALS

Earth fill:

Clean soil with Emerson Class 2(1), 3, 4, or 5, and free of roots, woody vegetation, rocks and other unsuitable material. Soil with Emerson Class 4 and 5 may not be suitable, depending on particle size distribution and degree of dispersion. Class 2(1) should only be used upon recommendation from geotechnical specialist.

Spillway rock:

Hard, angular, durable, weather resistant and evenly graded rock with 50% by weight larger than the specified nominal (d50) rock size. Large rock should dominate, with sufficient small rock to fill the voids between the larger rock. The diameter of the largest rock size should be no larger than 1.5 times the nominal rock size. The specific gravity should be at least 2.5.

Geotextile fabric:

Heavy-duty, needle-punched, non-woven filter cloth, minimum Bidim A24 or equivalent.

4.2 CONSTRUCTION

Notwithstanding any description contained within the approved plans or specifications, the Contractor shall be responsible for satisfying themselves as to the nature and extent of the specified works and the physical and legal conditions under which the works will be carried out. This shall include means of access, extent of clearing, nature of material to be excavated, type and size of mechanical plant required, location and suitability of water supply for construction and testing purposes, and any other like matters affecting the construction of the works.

Refer to approved plans for location, dimensions, and construction details. If there are questions or problems with the location, dimensions, or method of installation, contact the engineer or responsible on-site officer for assistance.

4.2.1 Embankment

Scarify areas on which fill is to be placed before placing the fill.

Unless otherwise specified on the approved plans, compact the soil at about 1% to 2% wet of optimum and to 95% modified or 100% standard compaction.

Where both dispersive and non-dispersive classified earth-fill materials are available, non-dispersive earth-fill must be used in the core zone.

After completion of the embankment, all loose uncompacted earth-fill material on the upstream and downstream batters must be removed prior to spreading of topsoil.

Topsoil and revegetate/stabilise all exposed earth, as directed within the approved plans.

4.2.2 Spillway Construction

Ensure excavated dimensions allow adequate boxing-out, such that the specified elevations, grades, chute width, and entrance and exit slopes for the spillway will be achieved after placement of the rock, or other scour protection measures, as specified on the plans.

Place specified scour protection measures on the spillway. Ensure the finished grade blends with the surrounding area, to allow a smooth flow transition from spillway to downstream channel.



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If a synthetic filter fabric underlay is specified, place the filter fabric directly on the prepared foundation. If more than one sheet of filter fabric is required, overlap the edges by at least 300mm and place anchor pins at minimum 1m spacing along the overlap. Bury the upstream end of the fabric a minimum 300mm below ground and, where necessary, bury the lower end of the fabric or overlap a minimum 300mm over the next downstream section, as required. Ensure the filter fabric extends at least 1000mm upstream of the spillway crest.

Take care not to damage the fabric, during or after placement. If damage occurs, remove the rock and repair the sheet by adding another layer of fabric, with a minimum overlap of 300mm around the damaged area. If extensive damage is suspected, remove and replace the entire sheet.

Where large rock is used, or machine placement is difficult, a minimum 100mm layer of fine gravel, aggregate, or sand may be needed to protect the fabric.

Placement of rock should follow immediately after placement of the filter fabric. Place rock so that it forms a dense, well-graded mass of rock, with a minimum of voids. The desired distribution of rock throughout the mass may be obtained by selective loading at the quarry and controlled dumping during final placement.

The finished slope should be free of pockets of small rock, or clusters of large rocks. Hand placing may be necessary to achieve the proper distribution of rock sizes to produce a relatively smooth, uniform surface. The finished grade of the rock should blend with the surrounding area. No overfall or protrusion of rock should be apparent.

Ensure that the final arrangement of the spillway crest will not promote excessive flow through the rock, such that the water can be retained within the settling basin at an elevation no less than 50mm above or below the nominated spillway crest elevation.

4.2.3 Settling Pond

Establish all required inflow chutes and inlet baffles, if specified, to enable water to discharge into the basin in a manner that will not cause soil erosion or the re-suspension of settled sediment.

Install a sediment storage level marker post with a cross member set just below the top of the sediment storage zone (as specified on the approved plans). Use at least a 75mm wide post firmly set into the basin floor.

If specified, install internal settling pond baffles. Ensure the crest of these baffles is set level with, or just below, the elevation of the emergency spillway crest.

Install all appropriate measures to minimise safety risk to on-site personnel and the public caused by the presence of the settling pond. Avoid steep, smooth internal slopes. Appropriately fence the settling pond and post warning a sign if unsupervised public access is likely, or there is considered to be an unacceptable risk to the public.

4.2.4 Maintenance

Inspect the sediment basin during the following periods:

During construction, to determine whether machinery, falling trees, or construction activity has damaged any components of the sediment basin. If damage has occurred, repair it.

After each runoff event. Inspect for erosion damage at flow entry and exit points. If damage has occurred, make the necessary repairs.

At least weekly during the nominated wet season (if any), otherwise at least fortnightly.

Prior to, and immediately after, periods of “stop work” or site “shutdown”.



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Clean out accumulated sediment when it reaches the marker board/post, and restore the original storage volume. Place sediment in a disposal area or, if appropriate, mix with dry soil on the site.

Do not dispose of sediment in a manner that will create an erosion or pollution hazard.

Check all visible pipe connections for leaks, and repair as necessary.

Check fill material in the dam for excessive settlement, slumping of the slopes, or piping between the conduit and the embankment; make all necessary repairs.

Remove all trash and other debris from the basin.

Submerged inflow pipes must be inspected and de-silted (as required) after each inflow event.

4.2.5 Removal of Sediment Basin

When grading and construction in the drainage area above a temporary sediment basin is completed, and the disturbed areas are adequately stabilised, the basin must be removed or otherwise incorporated into the permanent stormwater drainage system. In either case, sediment should be cleared and properly disposed of and the basin area stabilised.

All water and sediment must be removed from the basin prior to the basin removal. Dispose of sediment and water in a manner that will not create an erosion or pollution hazard.

Bring the disturbed area to a proper grade, then smooth, compact, and stabilise and/or revegetate, as required, to establish a stable land surface.



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5 DRAINAGE CONTROL DEVICES

All drainage control measures must be applied and maintained as detailed herein.

During the construction period, all reasonable and practicable measures must be implemented to control flow velocities in a manner that prevents soil erosion along drainage paths, and at the entrance and exit of all drains and drainage pipes, during all storms up to the relevant design storm discharge.

To the maximum degree reasonable and practicable, all waters discharged during the construction phase must discharge onto stable land, in a non-erosive manner, and at a legal point of discharge.

During the construction period, stormwater must be managed in a manner that minimises soil erosion throughout the site, and site wetness within active work areas.

The following drainage control devices may be used during the construction of the proposed works.

5.1 CATCH DRAIN

Used to collect and divert flows around a disturbance or across a slope. A channel liner is to be used with this device.

5.2 DIVERSION CHANNEL

Used for larger concentrated flows to divert flows around the work area.

5.3 SLOPE DRAIN

Used to discharge minor flows down steep slopes. To be sized and lined as appropriate for its design use and duration. Various lining options are available in the form of PVC, jute mate or other RECP products.

5.4 LEVEL SPREADER

Used at the end of flow diversion to discharge flows evenly across vegetated stable slopes.

5.5 OUTLET STRUCTURE

Structures are provided to dissipate energy at the end of chutes and slope drains or permanent stormwater outlets to dissipate energy from discharged runoff and to limit scour potential of flows. To be constructed out of hard angular rock, placed over a geofbaric layer. Depth and diameter of rock is to be confirmed and based on the design velocity of the drainage outlet discharge.



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6 EROSION AND SEDIMENT CONTROL PHASING

6.1 PHASE 1 – PRIOR TO COMMENCEMENT OF EARTHWORKS

With the initial phase of construction commencing in an area, bunds and cut-off drains are to be constructed on the lower extremity of the area to direct flows to the proposed sediment basin.

Sediment basins, cut-off drains and bunds are to be constructed, as indicated on the proposed erosion and sediment control plans contained herein, (refer to Appendix F).

Rock check dams, as per the erosion and sediment control plans, are to be installed along the cut-off drain to trap sediment, as close to the source as possible.

A stabilised access point at the existing entry onto Sarina Beach Road is to be constructed. The fences delineating the “No Go” areas of the required clearing areas are to be installed.

6.2 PHASE 2 – BULK EARTHWORKS

It is initially proposed to establish a bund to the extremities of the roadworks fill platform. This will contain any, and all, potentially contaminated flows and direct them to the proposed sediment basins.

A sediment fence is to be placed approximately 2m from the toe of the bund batter to assist in sediment control during the bund construction phase. Below the proposed extent of works, all mulched material is to be stockpiled, to act as additional sediment filter control, and is to be reused to cover batters as the works are completed.

The outer face of the bund is to be topsoiled and covered immediately to prevent wash from this surface. Once this outer face of the bund is stabilised, internal fill works may commence.

As the bulk earthworks construction progresses, bunds and cut-off drains will be established to cater for the specific earthworks area and to direct contaminated flows to the proposed sediment basin.

Each area of earthworks will be prepped, topsoiled and seeded, as soon as it is complete and then fenced off to prevent vehicle access. As batters are complete, they are to be topsoiled, mulched and vegetated, as soon as practical.

6.3 PHASE 3 - CIVIL CONSTRUCTION

Site contour drains/cut off banks will direct flows to the appropriate sediment basin.

As the roadways and pipe systems are installed, appropriate inlet filters will be provided as inlets are constructed.

As civil works construction proceeds, the areas for house sites and their respective firebreak areas are to be cleared. Clearing is to be undertaken by excavator mounted mulching equipment, or equivalent processes. Mulched material is to be spread over cleared areas, to prevent erosion and to protect topsoil.

6.4 PHASE 4 – POST CONSTRUCTION

On completion of all hardstand areas, the site will be established with appropriate water quality controls, prior to discharge to the swale to the north of the building platform.

As all areas are established and finalised, the sediment basins may be decommissioned and removed. The area of disturbance from the decommissioned basin is to be topsoiled, left in a roughened condition, and seeded.



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7 MAINTENANCE AND MANAGEMENT

7.1 MAINTENANCE CONSIDERATIONS

Maintenance inspections of all erosion and sediment control devices must be carried out at least weekly, and prior to, and after, rainfall events. The site foreman is responsible for the maintenance of all sediment and erosion control devices. Any issues with devices are to be noted and rectified or altered as necessary. The sediment basins are to be flocked and emptied as required. It is the responsibility of the contractor to ensure that verification testing of the water prior to discharge is undertaken and that the water quality complies with the requirements of the approvals.

7.2 SITE MANAGEMENT

All site office facilities and operational activities must be located such that any liquid effluent (e.g. process water, wash-down water, effluent from equipment cleaning, or plant watering), can be totally contained and treated within the site.

The construction schedule must aim to minimise the duration that any, and all, areas of soil are exposed to the erosive effects of wind, rain and surface water.

Land-disturbing activities must be undertaken in accordance with the Erosion and Sediment Control Plan (ESCP) and associated development conditions.

Land-disturbing activities must be undertaken in such a manner that allows all reasonable and practicable measures to be undertaken to:

allow stormwater to pass through the site in a controlled manner and at non-erosive flow velocities, up to the specified design storm discharge;

minimise soil erosion resulting from rain, water flow and/or wind;

minimise adverse effects of sediment runoff, including safety issues;

prevent, or at least minimise, environmental harm resulting from work-related soil erosion and sediment runoff;

ensure that the value and use of land/properties adjacent to the development (including roads) are not diminished as a result of the adopted ESC measures.

All erosion and sediment control measures must conform to the standards and specifications contained in:

the development approval conditions issued by Council and

this ESCP and supporting documentation; or

the latest version of IECA Best Practice Erosion and Sediment Control Guideline, if the standards and specifications are not contained in the approved ESCP.

Additional and/or alternative ESC measures must be implemented in the event that site inspections, the site Monitoring and Maintenance Program, or the regulatory authority, that unacceptable off-site sedimentation is occurring as a result of the work activities.

Sediment (including clay, silt, sand, gravel, soil, mud, cement and ceramic waste) deposited off the site, as a direct result of an on-site activity, must be collected and the area appropriately cleaned/rehabilitated, as soon as reasonable and practicable, and in a manner that gives appropriate consideration to the safety and environmental risks associated with the sediment deposition.



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Site spoil must be lawfully disposed of, in a manner that does not result in ongoing soil erosion or environmental harm.

Management of the site is the responsibility of the principal contractor, who is responsible for the appropriate construction and sequence of installation of all devices and measures contained in this document, and as indicated on the Erosion and Sediment Control Plans. The contractor is directed to Section 6 of IECA Best Practice Erosion and Sediment Control Guideline 2008 for compliance with managing the site.

The superintendent may, at their discretion, direct the contractor to carry out additional controls, as and when required. The contractor may also at their discretion opt to include additional devices, as may be required to ensure compliance with the approvals, as they see fit.

It is important to note, that the details contained herein, and on the attached concept erosion and sediment control plans, are not necessarily all the measures that may be necessary to fulfil the development approval requirements, and are to be a guide for the construction contractor.

7.3 SITE MAINTENANCE

All temporary erosion and sediment control measures, including drainage control measures, must be fully operational and maintained in proper working order, at all times during the construction period.

All drainage, erosion and sediment control measures must be inspected:

at least daily (when work is occurring on-site);

at least weekly (when work is not occurring on-site);

within 24 hours of expected rainfall; and

within 18 hours of a rainfall event of sufficient intensity and duration to cause runoff on-site.

Washing/flushing of sealed roadways must only occur where sweeping has failed to remove sufficient sediment and there is a compelling need to remove the remaining sediment (e.g. for safety reasons). In such circumstances, all reasonable and practicable sediment control measures must be used to prevent, or at least minimise, the release of sediment into receiving waters. Only those measures that will not cause safety and property flooding issues shall be employed. Sediment removed from roadways must be disposed of in a lawful manner that does not cause ongoing soil erosion or environmental harm.

Sediment removed from sediment traps and places of sediment deposition must be disposed of in a lawful manner that does not cause ongoing soil erosion or environmental harm.

7.4 MAINTENANCE PROGRAM

During the construction period, the contractor is to inspect all constructed erosion and sediment control devices to ensure that they are operational at all times. Refer to the attached inspection and testing plan. It is proposed to carry out weekly inspections of all erosion and sediment control devices.

Specific inspections of all devices are required prior to any significant rainfall event, and afterwards, to ensure that devices are operational at all times.

7.5 POST CONSTRUCTION

When works are complete and final inspections carried out, the monitoring program will reduce to monthly inspections and before and after significant rainfall events.



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7.6 EROSION AND SEDIMENT CONTROL PLAN REVIEW

The plans and reports comprising the erosion and sediment control plan are to be reviewed and updated, as required by the Superintendent, following consultation with the Contractor, Client and Council’s representative. This may be due to changes in construction sequencing or unforseen issues that may occur during the construction of the works. No change in the proposed erosion and sediment control devices is to increase the risk of potential environmental harm.

7.7 SITE MONITORING

All water quality data, including dates of rainfall, dates of testing, testing results and dates of water release, must be kept in an on-site register. The register is to be maintained up to date for the duration of the approved works and be available on-site for inspection by request.

All environmentally relevant incidents must be recorded in a field log, that must remain accessible to all relevant regulatory authorities.



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8 SITE REHABILITATION

No completed earthwork surface must remain denuded for longer than 30 days.

The type of ground cover / stabilisation method applied to completed earthworks is to be compatible with the anticipated long-term land use, environmental risk, and site rehabilitation measures.

8.1 SEDIMENT BASIN REHABILITATION

Required drainage, erosion and sediment control measures during the decommissioning and rehabilitation or a sediment basin must comply with same standards specified for the normal construction works.

Upon decommissioning of a sediment basin, all water and sediment must be removed from the basin prior to removal of the embankment (if any). Any such material, liquid or solid, must be disposed of in a manner that will not create an erosion or pollution hazard.

Basin catchment conditions associated with the staged decommissioning of the basin must comply with the specified sediment control standard.

A sediment basin must not be decommissioned until all up-slope site stabilisation measures have been implemented and are appropriately working to control soil erosion and sediment runoff, in accordance with the specified ESC standard.



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249803 130301 ESCP.docx Commercial in Confidence

Appendix A

Erosion Hazard Assessment



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Controlling factor Points Score

AVERAGE SLOPE OF THE DISTURBANCE AREA PRIOR TO OPERATIONAL

WORKS

< 2%

More than or equal to 2% but < 5%



More than or equal to 15%

0

1

2

4

5

4

SOIL type (to be disturbed)

Gravels and sandy soils

Sandy Loam

Clays on flood plains

Shallow soils on slopes

Clays on slopes >5% / imported fill or untested

1

2

3

4

5

1

DURATION OF SOIL DISTURBANCE

Duration < 2 weeks

more than 2 weeks but< 3 months

more than 3 months but < 6 months

more than 6 months

0

2

4

5

2

ANTICIPATED EROSIVE RAINFALL RISK DURING SITE DISTURBANCE

Low (Monthly average rainfall <45mm)

Moderate (monthly average rainfall 46 – 100mm)

High (monthly average rainfall 101-225mm)

Very High (monthly average rainfall 226 – 1500mm)

Extreme (monthly average rainfall >1500mm)

0

1

2

4

5

1

Off-site sediment control (down slope of the soil disturbance)

Score 1 point if stormwater run-off not diverted from entering the site or away from soil disturbance

1

0

Run-off entering the site

Score 1 point if stormwater run-off not diverted from entering the site or away from soil disturbance

1

0

Extent of Site disturbance:

Score 2 points if building works requires reshaping of the ground surface

2

2

(High erosion risk – if score 11 or greater, or 5 for any factor)

Total Score

10

Note: Hazard assessment table based on Table 4 EPA Best practice Urban Stormwater management – Erosion and Sediment

Control Guideline



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Appendix B

Inspection and Test Plan



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INSPECTION AND TEST PLAN

Area Reference: _________________ Sheet Number: ______ Location Description: ____________________________________________

Construction Activity

Specification Description

Testing Standard

Product / Service Responsibility

Person Responsible

Testing Frequency

Test Result

(Pass/Fail)

Hold Point

(Yes/No)

Date Hold/Witness Point Signature

Site establishment

Establishment works installed

Code XX.XXX Civil contractor John Citizen 1 per water source

No

Prior to earthworks commencement

Phase 1 controls installed and operational

Code XX.XXX Civil contractor Operator Each area Yes

Earthworks Phase 2 controls progressively installed and operational


Civil Works Phase 3 controls in place

Code XX.XXX Civil contractor Operator Each load No

Top Soil Prepared and rehabilitation appropriately

Code XX.XXX Civil contractor John Citizen 1 per water source

No

Road Works Prepared to specification


Rehabilitation / revegetation


Hydromulch Code XX.XXX Civil contractor Operator Each load No

Mulch Code XX.XXX Civil contractor Operator Each load No

Turf Code XX.XXX Civil contractor Operator Each load No



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Appendix C

Non Conformance Report



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NON-CONFORMANCE REPORT

Job Name: Job No:

Date: Client:

Details of non-conformance:

Details of specification/procedure not conforming to:

Non-conformance raised by:

Date:

Short-term preventative action:

Estimated cost of rework/re-training/waste:

Long-term preventative action:

Accepted/rejected by the Client:

Signed:

Date:

Non-conformance resolved:

Signed:

Date:



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Appendix D

Construction Checklists



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SEDIMENTATION BASIN CONSTRUCTION CHECKLIST

Site: Inspected By:

Construction By: Date / Time:

Contact During site

visit:

Weather:

Items Inspected Checked

Y/N

Satisfactory

Y/N


Y/N

Satisfactory

Y/N

DURING CONSTRUCTION

A. FUNCTIONAL INSTALLATION Structural Components (continued)

Preliminary Works 19. No seepage through banks

1. Erosion and sediment control plan

adopted 20. Inlet energy dissipation installed

2. Limit public access 21. No seepage through banks

3. Location same as plans 22. Ensure spillway is level

4. Site protection from existing flows 23. Provision of maintenance drain

B. Earthworks 24. Collar installed on pipes

5. Integrity of banks Vegetation

6. Batter slopes as plans 25. Stabilisation immediately following earthworks

7. Impermeable (eg. clay) base installed 26. Weed removal prior to planting

8. Maintenance access (eg. ramp)

installed 27. Planting as designed (species and densities)

9. Compaction process as designed 28. Vegetation layout and densities as designed

10. Level of base, banks/ spillway as

designed

11. Check for groundwater intrusion B. EROSION AND SEDIMENT

CONTROL

12. Stabilisation with sterile grass 29. Sediment bains to be used during construction

Structural Components 30. Stabilisation immediately following earthworks

and planting of terrestrial landscape around basin

13. Location and levels of outlet as

designed 31. Silt fences and traffic control in place

14. Safety protection provided

15. Pipe joints and connections as

designed C. OPERATIONAL ESTABLISHMENT

16. Concrete and reinforcement as

designed

32. Sediment basin desilted

17. Inlets appropriately installed

18. Inlet energy dissipation installed



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SWALE CONSTRUCTION CHECKLIST

Site: Inspected By:

Construction By: Date / Time:

Contact During site

visit:

Weather:


Y/N

Satisfactory

Y/N


Y/N

Satisfactory

Y/N

DURING CONSTRUCTION

A. FUNCTIONAL INSTALLATION Structural Components

Preliminary Works 13. Location and levels of pits as designed

1. Erosion and sediment control plan

adopted 14. Safety protection provided

2. Traffic control measures 15. Location of check dams as designed

3. Location same as plans 16. Swale crossings located/built as designed

4. Site protection from existing flows 17.Pipe joints/connections as designed

5. Critical root zones (0.5m beyond drip

line) of nominated trees are protected 18. Concrete and reinforcement as designed

B. Earthworks 19. Inlets appropriately installed

6. Existing topsoil is stockpiled for reuse 20. Inlet erosion protection installed

7. Level bed of swale 21. Set down to correct level for flush kerbs

8. Batter slopes as plans B. EROSION AND SEDIMENT

CONTROL

9. Longitudinal slope in design range 22. Silt fences and traffic control in place

10. Provision of sub-soil drainage for

mild slopes (<1%) 23. Stabilisation immediately following earthworks

11.Compaction process as designed C. OPERATIONAL ESTABLISHMENT

12. Appropriate topsoil on swale Vegetation

24. Test and ameliorate topsoil, if required

25. Planting as designed (species/densities)

26. Weed removal and watering as required

FINAL INSPECTION



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Appendix E

Maintenance Checklists



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SEDIMENTATION BASIN MAINTENANCE CHECKLISTS

Inspection Frequency Date of Visit:

Location

Description

Site Visit by

Inspections Items Y N Action Required (Details)

Litter accumulation

Sediment accumulation at inflow

points?

Sediment requires removal (record

depth, remove if >50%)?

All structures in satisfactory condition

(pits, pipes, ramps etc)?

Evidence of dumping (Building Waste,

Oils etc)?

Littoral vegetation condition

satisfactory (density, weeds etc)?

Replanting required?

Weeds require removal from within

basin?

Settling or erosion of bunds/batters

present?

Damage/Vandalism to structures

present?

Outlet structure free of debris?

Maintenance drain operational?

Resetting of system required?

COMMENTS



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EROSION AND SEDIMENT CONTROL INSPECTION CHECKLIST

Site Inspected

By:

Contractor Date /

Time:


Y/N

Satisfactory

Y/N

Comments

Public roadways clear of sediment

Entry/Exits clear of sediment

Construction site clear of litter or

unconfined rubbish

Adequate Stockpiles of emergency ESC

materials exist

Site dust controlled

Stabilised clean water diversions in place

and operational

Sediment Fences clean and operational

Check Dams clean and operational

Sediment traps clean and operational

Sediment controls to stormwater inlets in

place and operational

Sediment Basin Outlets stable and free

from erosion

Sediment basin cleaned out and

operational

Contour Banks and cutoff drains free

from scour and sediment

Seeding/Hydromulch to completed areas

underway/complete

Site is free from obvious rill erosion

No areas of exposed soil are in need of

erosion control

Site Compound

Stock Piles

Long term – protected from wind rain

Short term – protected from runoff

All completed surfaces are appropriately

prepared prior to vegetation

Stabilised surfaces have adequate

coverage

All reasonable and practical measures

are being taken to control sediment runoff

from the site

The site is adequately prepared for

imminent storms

All ESC measures are in proper working

order

Satisfactory water quality confirmation

testing of discharges recorded



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SWALE (AND BUFFER) MAINTENANCE CHECKLIST

Asset I.D.:

Inspection Frequency:

Date of visit:

Location:

Description:

Site Visit by:

INSPECTION ITEMS Y N ACTION REQUIRED (DETAILS)

Sediment accumulation at inflow points?

Litter within swale?

Erosion at inlet or other key structures

(eg. crossovers)?

Traffic damage present?

Evidence of dumping (eg. building

waste)?

Vegetation condition satisfactory (density,

weeds etc)?

Replanting required?

Mowing required?

Sediment accumulation at outlets?

Clogging of drainage points (sediment or

debris)?

Evidence of ponding?

Set down from kerb still present?

Soil additives or amendments required?

Pruning and/or removal of dead or

diseased vegetation required?

COMMENTS



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Appendix F

Conceptual Erosion and Sediment Control Plans

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