Erosion and Sediment Control Plan - Creek to Coral Plan2010.pdf · The Erosion and Sediment Control Plan should consider a method of stabilising the structure(s) used to conduct the

0

KAOS KONSULTING

November 2010 Authored by: Kaos

Erosion and Sediment Control Plan

Proposed 32 Lot Subdivision GIFFORD STREET, HORSESHOE BAY

1

Erosion and Sediment Control Plan | November 2010

EEEEROSION AND ROSION AND ROSION AND ROSION AND SSSSEDIMENT EDIMENT EDIMENT EDIMENT CCCCONTROL ONTROL ONTROL ONTROL PPPPLANLANLANLAN

Proposed 32 Lot Subdivision GIFFORD STREET, HORSESHOE BAY

IntroductionIntroductionIntroductionIntroduction

This Erosion and Sediment Control Plan has been prepared to provide a set of Best Practice site management procedures to control the severity and extent of soil erosion for the 32 lot development on Gifford Street, Horseshoe Bay.

IntentIntentIntentIntent

The purpose of this Plan is to minimise soil erosion and the discharge of sediment to land and waterways as a result of the residential development. It is also designed to restrict pollutant transport during the earthworks and construction phase.

The Plan will meet this objective by ensuring that best practice environmental management measures are incorporated into all stages of the operations of construction of the development.

ScopeScopeScopeScope

The Plan applies to all construction operations that disturb material or has the potential to result in environmental harm as a result of the migration of material from its original location. This includes operations undertaken on both private or crown land.

General conditions applying to the development siteGeneral conditions applying to the development siteGeneral conditions applying to the development siteGeneral conditions applying to the development site

1. No water is to be allowed to pool on site, but this does not prohibit the use of sediment basins or similar structures to trap sediment, if appropriate. Finished slopes on the job site must have a minimum fall of 0.01% (1 mm fall in 10 m).

2. All of the site drainage waters must eventually go to kerb and channel on an adjacent road. This may involve cutting, filling, or possibly sub-surface stormwater drainage at the site.

3. Waters collected in kerb and channel will be conveyed by open swale drainage paths to a nearby stream or river. The permanent drainage swale is on the northern side of the road on the north side of the Magnetic Island development.

4. The Erosion and Sediment Control Plan should consider a method of stabilising the structure(s) used to conduct the discharge waters from the site into the receiving waters of the stream or river, and the incorporation of temporary controls into long-term site management.

5. A maintenance plan should be included for each permanent erosion, drainage, or sediment control measure adopted.

2


Site ConditionsSite ConditionsSite ConditionsSite Conditions

Nature of the siteNature of the siteNature of the siteNature of the site

The site of 5.98 ha (260 x 230 m) lies between 22 m and 17 m AHD on a granitic hill with a gentle slope. Site drainage is into a short coastal stream that discharges into marine receiving waters with fringing coral reefs; environmental conditions on the development of the site stipulate that no nutrient or sediment will leave the site in drainage waters or in leachates entering the groundwater system. The vegetation of the site was originally open eucalypt woodland that has been cleared and now consists of native tree and shrub regrowth with a thick ground cover of herbaceous weeds.

Nature of the soi lsNature of the soi lsNature of the soi lsNature of the soi ls

Soil profiles were described from 18 hand-augured boreholes that were drilled over the site. The soils are remarkably similar and have formed in coarse sandy or gritty, weathered granitic sediments (‘deco’) that make up a large, low angle, alluvial fan at the foot of the eastern hills. The soil profiles are of light (sandy) textures and their whole coloured (non-mottled), brown to reddish brown subsoils provide no indication of impeded drainage in the soil profile.

Soil samples were collected from two of the described soil boreholes and were submitted to a commercial laboratory for chemical analysis. Refer to Appendix A for the Soil Analysis provided.

Nature of the Cl imateNature of the Cl imateNature of the Cl imateNature of the Cl imate

The Townsville area has a tropical climate with two distinct seasons; one wet, the other dry. According to the Bureau of Meteorology the average annual rainfall is 1143mm through an average 91 rain days, most of which falls in the six-month "wet season" November to April. Due to the "hit or miss" nature of tropical lows and thunderstorms, there is considerable variation from year to year. Construction activities during this wet season will be unavoidable.

3


Performance CriteriaPerformance CriteriaPerformance CriteriaPerformance Criteria Water discharged from the site is to comply with Environmental Protection Water Policy, 2009 to ensure that no detrimental impacts on water quality and the environment occur during the construction phase.

The quality of discharge from the site to satisfy the following Water Quality Objectives (WQOs):

Release Criteria:

• An increase in suspended solids within surface waters contained in [insert name] – upstream of site to downstream of site – of less than 10%.

• Water pH released from a controlled sediment basin outflow must be within the range 6.5 to 8.5.

• Suspended Solids released from controlled sediment basin outflows must be no greater than 50mg/L.

• Oils and Grease – no visible films or odour.

• Litter – no visible litter washed or blown from the site.

ResponsibilityResponsibilityResponsibilityResponsibility The owner of the property will be responsible for the implementation of the Water Quality Monitoring Program (WQMP) during the course of all construction activities. They will:

• Have overall responsibility for the on-site implementation of the erosion and sediment control plan,

• Oversee the erosion and sediment control monitoring program and advise of the need to upgrade on-site works, where appropriate,

• Have authority to expend Contingency Funds, as needed on-site.

The Construction Contractor will be responsible for the implementation of the Stormwater Management Plan (SWMP) during the course of all construction activities. They must hold a Certificate of Attainment in erosion and sediment control works (a 2-day industry course).

Prior to the commencement of any work on site, all operators and site workers will receive a site induction on the erosion and sediment control plan.

4


Implementation StrategyImplementation StrategyImplementation StrategyImplementation Strategy

Erosion and Sediment Control PlanErosion and Sediment Control PlanErosion and Sediment Control PlanErosion and Sediment Control Plan

The permanent and temporary SESC measures required during the construction of the development and beyond are shown in the plans contained in Appendix B. As the construction will be done in three stages, a plan has been drawn showing the required measures for each stage. The details and Standard Drawings for each SESC measure used can be found in Appendix C.

Soil AmeliorationSoil AmeliorationSoil AmeliorationSoil Amelioration

Due to the existing topsoil being infested with herbaceous weeds and this topsoil having a general lack of macronutrients. The top 100mm of soil is to be stripped and buried onsite to a minimum depth of 300mm.

The development has a negative cut/fill balance; as such fill will be required to be imported to achieve the designed surface levels. With a lack of appropriate topsoil in the Townsville area and for economic reasons, it is intended for this imported fill to only be of sub soil quality. The topsoil that is to be replaced to a comparable depth of the current site will be obtained through on-site treatment of the existing sub soils with gypsum, organic material and nutrient fertilizers to bring this soil up to topsoil standard.

Any exposed sub-soils will be ripped to assist in the incorporation of gypsum. The gypsum is required to improve the physical and chemical properties of the sub-soils and to reduce the risk of erosion.

General General General General Detai lsDetai lsDetai lsDetai ls

Clean up of general site litter on a weekly basis, prior to anticipated heavy rainfall and after significant rainfall events (>25mm/24hours).

Landscaping activities and revegetation to occur as soon as practical after completion of earthworks and construction activities within the immediate area and must achieve a minimum 70% coverage of all erodible surfaces.

Only appropriate herbicides and fertilisers to be used.

The storage and handling of flammable and combustible liquids is managed in accordance with AS1940–1993.

Dust SuppressionDust SuppressionDust SuppressionDust Suppression

The control of dust will primarily be achieved through the use of water carts. However any area expected to be untouched for a period of fourteen days or more will be vegetated with a quick growing sterile millet or similar plantings.

Inspection Test PlanInspection Test PlanInspection Test PlanInspection Test Plan

An inspection test plan will be used to monitor the installation of each ESC structure. The Site Foreman will complete the plan. The plan can be found in Appendix E.

5


MonitoringMonitoringMonitoringMonitoring Erosion and sediment control (ESC) measures to be inspected daily by the site manager (or nominated representative) during periods of runoff-producing rainfall, and de-silted, repaired and amended as appropriate to maintain the WQOs. The monitoring checklist can be found in Appendix F.

1. Daily site inspections, during periods of runoff-producing rainfall must include:

• all drainage, erosion and sediment control measures;

• occurrences of excessive sediment deposition (whether on-site or off-site);

• all site discharge points.

2. Weekly site inspections must include:



• occurrences of construction materials, litter or sediment placed, deposited, washed or blown from the site, including deposition by vehicular movements;

• litter and waste receptors;

• oil, fuel and chemical storage facilities.

3. Site inspections immediately prior to anticipated runoff-producing rainfall must include:


• all temporary (e.g. over-night) flow diversion and drainage works.

4. Site inspections immediately following runoff-producing rainfall must include:

• treatment and de-watering requirements of sediment basins;

• sediment deposition within sediment basins and the need for its removal;



• occurrences of construction materials, litter or sediment placed, deposited, washed or blown from the site, including deposition by vehicular movements;

• occurrences of excessive erosion, sedimentation, or mud generation around the site office, car park and material storage areas.

5. In addition to the above, monthly site inspections must include:

• surface coverage of finished surfaces (both area and percentage cover);

• health of recently established vegetation;

• proposed staging of future site clearing, earthworks and site/soil stabilisation.

6


Water quality monitoring must be carried out on any controlled discharge of water from a sediment basin, including water pH and suspended solids.

• Water quality monitoring at the nominated monitoring stations must be carried out monthly and following significant rainfall (>25mm in 72hrs).

The parameters to be tested for waters collected at monitoring stations must include: temperature, dissolved oxygen, pH, specific conductance, salinity, turbidity, suspended solids, and litter.

Note that additional water quality monitoring maybe required if the WQOs are not being met.

AuditingAuditingAuditingAuditing ESCP reviews are to be carried out on a monthly basis to assess the implementation strategy. A checklist is to be completed which assesses the strategies listed above. Refer to Appendix F.

Identification of Incident or FailureIdentification of Incident or FailureIdentification of Incident or FailureIdentification of Incident or Failure Non-compliance with agreed performance criteria will be identified by:

1. Visual inspections identifying:

• build-up of sediment off the site;

• excessive sediment build-up on the site;

• excessive erosion on the site;

• release of construction material from the site;

• poor vegetation establishment;

• poorly maintained, damaged or failed ESC devices.

2. Deteriorated water quality identified by the Environmental Consultant as being attributable to the construction activities.

Corrective ActionCorrective ActionCorrective ActionCorrective Action After any identification of incident or failure, the source/cause is to be immediately located and the following measures implemented:

• Build-up of sediment off the site – the material must be collected and disposed of in a manner that will not cause ongoing environmental nuisance or harm; then on-site ESC measures amended, where appropriate, to reduce the risk of further sedimentation.

• Excessive sediment build-up on the site – collect and dispose of material, then amend up-slope drainage and/or erosion control measures as appropriate to reduce further occurrence.

• Severe or excessive rill erosion – investigate cause, control up-slope water movement, re-profile surface, cover dispersive soils with a minimum 100mm layer of non-dispersive soil, and stabilise with erosion control blankets and vegetation as necessary.

• Off-stream erosion – fill rills, vegetate and install velocity control measures.

• In-stream erosion – consult appropriate hydraulic/waterway consultant for advice.

7


• Release of construction material from the site – collected and disposed of in a manner that will not cause ongoing environmental nuisance or harm; then inspect litter and waste receptors.

• Poor vegetation growth or soil coverage – plant new vegetation and/or mulch as required. Newly planted and previously planted areas may require supplementary watering and replanting.

• Sediment fence failure – replace and monitor more frequently. Regular failures may mean that the sediment fence location, alignment or installation may need to be amended.

If the release of excessive sediment and/or other materials off the site occurs, or water quality monitoring indicates levels are not within the WQOs, clean up deposition, and inspect all control measures.

If the release of excessive sediment and/or other materials off the site is identified during two consecutive site inspections, or water quality monitoring indicates levels not within the WQOs on two consecutive monthly tests, then review and revise the ESCP, or otherwise reduce the rate, extent and/or duration of soil exposure.

If monitored levels within any sediment basin does not conform to the release criteria for:

• suspended solids – flocculate and retest;

• pH – add acid if pH is too high, or add hydrated lime if pH is too low, and retest.

ReportingReportingReportingReporting Reports will be submitted monthly during the construction at each stage. The reporting will include:

• Construction Contractor site manager’s report; and

• Environmental Consultant’s water quality monitoring report.

Reporting will conform to Townsville City Council standards and identify performance of the implementation strategy, monitoring, identification of incidents and failure, and necessary/adopted corrective action. Reports will be submitted to the owner (or their appointed representative) monthly for submission to the Townsville City Council.

8


Signed StatementSigned StatementSigned StatementSigned Statement

I have reviewed the attached Soil Erosion and Sediment Control Plan.

I certify that it adequately meets the above key requirements (with

stated qualifications, where appropriate).

Name …………………………..…………….

Signed ……………..………………………..

TCC / CPESC Accreditation No. ………123456789………..

Date …………12th December 2010...................

1


APPENDIXAPPENDIXAPPENDIXAPPENDIX A:A:A:A: SSSSOIL OIL OIL OIL AAAANALYSISNALYSISNALYSISNALYSIS

Ap

pe

nd

ix A

| N

ove

mb

er

20

10

Table 1: MainTable 1: MainTable 1: MainTable 1: Main f ield morphological properties f ield morphological properties f ield morphological properties f ield morphological properties of of of of two two two two soil profi lesoil profi lesoil profi lesoil profi lessss from the planned from the planned from the planned from the planned 32323232---- lot lot lot lot residential residential residential residential

developmentdevelopmentdevelopmentdevelopment , Magnetic Isla, Magnetic Isla, Magnetic Isla, Magnetic Islannnndddd. . . .

0-25 Ap 25 Dark brown 7.5YR 3/2 light sandy loam gritty clear

25-43 A1 18 Dark brown 7.5YR 3/3 loamy sand gritty clear

43-75 B1 32 Reddish brown 5YR 4/4 sand gritty diffuse

75-130 B2 55 Reddish brown 5YR 4/6 light sandy loam gritty diffuse

130-220 + C 90 + Strong brown 7.5YR 5/6 sand gritty

0-25 Ap 25 Dark brown 7.5YR 3/2 light sandy loam gritty clear

25-53 A1 28 Dark brown 7.5YR 3/3 light loamy sand gritty diffuse

53-94 B2 41 Dark reddish brown 5YR 3/4 loamy sand gritty diffuse Light texture, strong colour B

94-150 C1 56 Strong brown 7.5YR 4/6 sand gritty clear

150-187 + C2 37 + Reddish brown 5YR 4/4 sandy clay loam gritty Minor manganese stains on some grit

Profile B3: Lot 48, southeastern corner of planned development

Comments

Profile A1: Lot 15, northwestern corner of planned development

Some coarse subangular quartz gravel

Well sorted granitic sand

Sample

depth

(cm)

Field

Texture

> 2 mm

fraction

Lower

boundary

Horizon

name

Horizon

thickness

(cm)

Soil colour (moist)Munsell colour

code (moist)

Ap

pe

nd

ix A

| N

ove

mb

er

20

10

Table Table Table Table 2222: Main chemical propert ies of : Main chemical propert ies of : Main chemical propert ies of : Main chemical propert ies of a typical a typical a typical a typical soi l profi le from the planned soi l profi le from the planned soi l profi le from the planned soi l profi le from the planned 32323232---- lot lot lot lot residential develresidential develresidential develresidential developmentopmentopmentopment , , , ,

Magnetic IslaMagnetic IslaMagnetic IslaMagnetic Islannnndddd....

Values shown in the shaded cel ls l ie outside the range of desirable values for revegetation works.

pH

(1:5

Water)

Electrical

Conductivit

y

ChlorideOrganic

Carbon

Phosphoru

s (Colwell)

Phosphorus

Buffer Index

Sulfate

Sulfur

MCP

Cation

Exchange

Capacity

Exch.

Calcium

Exch.

Magnesiu

m

Exch.

Potassium

Exch.

Sodium

Exch.

Calcium

Exch.

Magnesiu

m

Exch.

Potassium

Exch.

Sodium

dS/m mg/kg % mg/kg mg/kg meq/100g meq/100g meq/100g meq/100g meq/100g % % % %

Desirable

value 6.5 - 7.0 < 0.25 dS/m

< 300

mg/kg > 2 % > 40 mg/kg < 100 10 - 80 mg/kg

> 4

meq/100g >1 meq/100g

> 0.15

meq/100g

> 0.3

meq/100g meq/100g 60 - 80 % 15 -25 % 2 - 4 % < 6 %

Profile A1: Lot 15, northwestern corner of planned development

A1.1 0-15 cm 6.7 0.05 17 1.1 6 28 4 7.65 5.5 1.60 0.35 0.20 72 21 5 3

A1.2 15-30 cm 6.9 0.04 19 0.7 5 28 3 5.21 3.5 1.20 0.23 0.28 67 23 4 5

A1.3 45-60 cm 7.1 0.04 18 0.4 5 26 3 3.86 2.5 0.77 0.21 0.38 65 20 5 10

A1.6 165-180 6.8 0.02 10 0.2 6 19 10 3.07 2.1 0.68 0.12 0.17 68 22 4 6

Profile B3: Lot 48, southeastern corner of planned development

B1.1 0-15 cm 6.7 0.04 10 1.2 8 21 3 8.76 6.0 2.10 0.35 0.31 68 24 4 4

B1.2 15-30 cm 6.8 0.03 10 0.6 8 26 2 4.95 3.2 1.20 0.25 0.30 65 24 5 6

B1.3 50-60 cm 7.0 0.02 10 0.2 5 39 6 3.19 1.4 1.10 0.28 0.31 44 34 9 10

B1.6 165-180

cm

6.6 0.01 10 0.2 5 15 2 2.83 1.7 0.77 0.11 0.15 60 27 4 5

Exchangeable cations (%)

Sample

No.

Sample

depth

Acidity, alkalinity, and salinity Macronutrients Exchangeable cations (meq / 100 g soil)

2


AAAAPPENDIXPPENDIXPPENDIXPPENDIX BBBB:::: ESCPESCPESCPESCP DDDDRAWINGSRAWINGSRAWINGSRAWINGS

GIFFORD STREET

HO

RS

ES

HO

E B

AY R

OA

D

SO

ME

RS

ET S

TRE

ET

Dark Brown Light Sandy Loam

Dark Brown Light Sandy Loam

Legend

A1 Full Size

3 November 2010Acad No. SESC Assign.dwg

SESC - SK01

GIFFORD STREET, HORSEHOE BAY

Sheet 1 of 6

Proposed 32 Lot Subdivision

1:1000

EXISTING SITE CONDITIONS

GIFFORD STREET

HO

RS

ES

HO

E B

AY R

OA

D

SO

ME

RS

ET S

TRE

ET

Earthworks

Legend

General

A1 Full Size


SESC - SK02


Sheet 2 of 6


1:1000

SITE MODIFICATIONS

GIFFORD STREET

HO

RS

ES

HO

E B

AY R

OA

D

SO

ME

RS

ET S

TRE

ET

Area A27,220 m2

Area B31,890 m2

CD01

CD02

CD03CD04

CD05

CD06

DC01

EXITa

EXITb

SB02

SB01

RP01

SF01SF02 Legend

A1 Full Size


SESC - SK03


Sheet 3 of 6


1:1000

ESCP STAGE ONE

GIFFORD STREET

HO

RS

ES

HO

E B

AY R

OA

D

SO

ME

RS

ET S

TRE

ET

ESC1

ESC2

Legend

A1 Full Size


SESC - SK04


Sheet 4 of 6


1:1000

ESCP STAGE TWO

GIFFORD STREET

HO

RS

ES

HO

E B

AY R

OA

D

SO

ME

RS

ET S

TRE

ETESC3

ESC4

ESC5

ESC6

Legend

A1 Full Size


SESC - SK05


Sheet 5 of 6


1:1000

ESCP STAGE THREE

GIFFORD STREET

HO

RS

ES

HO

E B

AY R

OA

D

SO

ME

RS

ET S

TRE

ET

Legend

A1 Full Size


SESC - SK06


Sheet 6 of 6


1:1000

COMPLETED DEVELOPEMENT

3


APPENDIXAPPENDIXAPPENDIXAPPENDIX CCCC:::: ESCPESCPESCPESCP DDDDETAILSETAILSETAILSETAILS

MATERIALS

ROCK: WELL GRADED, HARD, ANGULAR,EROSION RESISTANT ROCK, NOMINALDIAMETER OF 50 TO 75mm (SMALLDISTURBANCES) OR 100 TO 150mm(LARGE DISTURBANCES). ALLREASONABLE MEASURES MUST BETAKEN TO OBTAIN ROCK OF NEARUNIFORM SIZE.

FOOTPATH STABILISING AGGREGATE: 25TO 50mm GRAVEL OR AGGREGATE.

GEOTEXTILE FABRIC: HEAVY-DUTY,NEEDLE-PUNCHED, NON-WOVEN FILTERCLOTH (’BIDIM’ A24 OR EQUIVALENT).

INSTALLATION

1. REFER TO APPROVED PLANS FORLOCATION AND DIMENSIONAL DETAILS. IFTHERE ARE QUESTIONS OR PROBLEMSWITH THE LOCATION, DIMENSIONS, ORMETHOD OF INSTALLATION, CONTACTTHE ENGINEER OR RESPONSIBLEON-SITE OFFICER FOR ASSISTANCE.

2. CLEAR THE LOCATION OF THE ROCKPAD, REMOVING STUMPS, ROOTS ANDOTHER VEGETATION TO PROVIDE A FIRMFOUNDATION SO THAT THE ROCK IS NOTPRESSED INTO SOFT GROUND. CLEARSUFFICIENT WIDTH TO ALLOW PASSAGEOF LARGE VEHICLES, BUT CLEAR ONLYTHAT NECESSARY FOR THE EXIT. DO NOTCLEAR ADJACENT AREAS UNTIL THEREQUIRED EROSION AND SEDIMENTCONTROL DEVICES ARE IN PLACE.

3. IF THE EXPOSED SOIL IS SOFT,PLASTIC OR CLAYEY, PLACE A SUB-BASEOF CRUSHED ROCK OR A LAYER OFHEAVY-DUTY FILTER CLOTH TO PROVIDEA FIRM FOUNDATION.

4. PLACE THE ROCK PAD FORMING AMINIMUM 200mm THICK LAYER OF CLEAN,OPEN-VOID ROCK.

5. IF THE ASSOCIATED CONSTRUCTIONSITE IS UP-SLOPE OF THE ROCK PAD,THUS CAUSING STORMWATER RUNOFFTO FLOW TOWARDS THE ROCK PAD,THEN FORM A MINIMUM 300mm HIGHFLOW CONTROL BERM ACROSS THEROCK PAD TO DIVERT SUCH RUNOFF TOA SUITABLE SEDIMENT TRAP.

6. THE LENGTH OF THE ROCK PADSHOULD BE AT LEAST 15m WHEREPRACTICABLE, AND AS WIDE AS THE FULLWIDTH OF THE ENTRY OR EXIT AND ATLEAST 3m. THE ROCK PAD SHOULDCOMMENCE AT THE EDGE OF THEOFF-SITE SEALED ROAD OR PAVEMENT.

7. FLARE THE END OF THE ROCK PADWHERE IT MEETS THE PAVEMENT SOTHAT THE WHEELS OF TURNINGVEHICLES DO NOT TRAVEL OVERUNPROTECTED SOIL.

8. IF THE FOOTPATH IS OPEN TOPEDESTRIAN MOVEMENT, THEN COVERTHE COARSE ROCK WITH FINEAGGREGATE OR GRAVEL, OROTHERWISE TAKE WHATEVER MEASURESARE NEEDED TO MAKE THE AREA SAFE.

MAINTENANCE

1. INSPECT ALL SITE ENTRY AND EXITPOINTS PRIOR TO FORECAST RAIN, DAILYDURING EXTENDED PERIODS OFRAINFALL, AFTER RUNOFF-PRODUCINGRAINFALL, OR OTHERWISE ATFORTNIGHTLY INTERVALS.

2. IF SAND, SOIL, SEDIMENT OR MUD ISTRACKED OR WASHED ONTO THEADJACENT SEALED ROADWAY, THENSUCH MATERIAL MUST BE PHYSICALLYREMOVED, FIRST USING ASQUARE-EDGED SHOVEL, AND THEN ASTIFF-BRISTLED BROOM, AND THEN BY AMECHANICAL VACUUM UNIT, IFAVAILABLE.

3. IF NECESSARY FOR SAFETY REASONS,THE ROADWAY SHALL ONLY BE WASHEDCLEAN AFTER ALL REASONABLEEFFORTS HAVE BEEN TAKEN TO SHOVELAND SWEEP THE MATERIAL FROM THEROADWAY.

4. WHEN THE VOIDS BETWEEN THE ROCKBECOMES FILLED WITH MATERIAL ANDTHE EFFECTIVENESS OF THE ROCK PADIS REDUCED TO A POINT WHERESEDIMENT IS BEING TRACKED OFF THESITE, A NEW 100mm LAYER OF ROCKMUST BE ADDED AND/OR THE ROCK PADMUST BE EXTENDED.

5. ENSURE ANY ASSOCIATED DRAINAGECONTROL MEASURES (e.g. FLOWCONTROL BERM) ARE MAINTAINED INACCORDANCE WITH THEIR DESIREDOPERATIONAL CONDITIONS.

6. DISPOSE OF SEDIMENT AND DEBRIS INA MANNER THAT WILL NOT CREATE ANEROSION OR POLLUTION HAZARD.

REMOVAL

1. THE ROCK PAD SHOULD BE REMOVEDONLY AFTER IT IS NO LONGER NEEDEDAS A SEDIMENT TRAP.

2. REMOVE MATERIALS AND COLLECTEDSEDIMENT AND DISPOSE OF IN ASUITABLE MANNER THAT WILL NOTCAUSE AN EROSION OR POLLUTIONHAZARD.3. RE-GRADE AND STABILISE THEDISTURBED GROUND AS NECESSARY TOMINIMISE THE EROSION HAZARD.

CONSTRUCTION NOTES:

MATERIALS

ROCK: WELL GRADED, HARD, ANGULAR,EROSION RESISTANT ROCK, NOMINALDIAMETER OF 40 TO 75mm.

FOOTPATH STABILISING AGGREGATE: 25 TO50mm GRAVEL OR AGGREGATE (IF REQUIRED).

GEOTEXTILE FABRIC: HEAVY-DUTY,NEEDLE-PUNCHED, NON-WOVEN FILTERCLOTH (‘BIDIM’ A24 OR EQUIVALENT).

INSTALLATION

1. INSPECT ALL SITE ENTRY AND EXIT POINTSPRIOR TO FORECAST RAIN, DAILY DURINGEXTENDED PERIODS OF RAINFALL, AFTERRUNOFF-PRODUCING RAINFALL, OROTHERWISE AT FORTNIGHTLY INTERVALS.

2. IF SAND, SOIL, SEDIMENT OR MUD ISTRACKED OR WASHED ONTO THE ADJACENTSEALED ROADWAY, THEN SUCH MUST BEPHYSICALLY REMOVED, FIRST USING ASQUARE-EDGED SHOVEL, AND THEN A

STIFF-BRISTLED BROOM, AND THEN BY AMECHANICAL VACUUM UNIT, IF AVAILABLE.

3. IF NECESSARY FOR SAFETY REASONS, THEROADWAY SHALL ONLY BE WASHED CLEANAFTER ALL REASONABLE EFFORTS HAVE BEENTAKEN TO SHOVEL AND SWEEP THE MATERIALFROM THE ROADWAY.

4. WHEN THE VOIDS BETWEEN THE ROCKBECOMES FILLED WITH MATERIAL AND THEEFFECTIVENESS OF THE ROCK PAD ISREDUCED TO A POINT WHERE SEDIMENT ISBEING TRACKED OFF THE SITE, A NEW 100mmLAYER OF ROCK MUST BE ADDED AND/OR THEROCK PAD MUST BE EXTENDED.

5. ENSURE ANY ASSOCIATED DRAINAGECONTROL MEASURES (e.g. FLOW CONTROLBERM) ARE MAINTAINED IN ACCORDANCEWITH THEIR DESIRED OPERATIONALCONDITION.

6. DISPOSE OF SEDIMENT AND DEBRIS IN AMANNER THAT WILL NOT CREATE AN EROSIONOR POLLUTION HAZARD.

INSTALLATIONTHE METHOD OF INSTALLATION VARIES WITHTHE TYPE OF TURF REINFORCEMENT MAT(TRM). INSTALLATION PROCEDURES SHOULDBE PROVIDED BY THE MANUFACTURER ORDISTRIBUTOR OF THE PRODUCT. A TYPICALINSTALLATION PROCEDURE FOR NONPRE-GROWN TRMs IS DESCRIBED BELOW, BUTSHOULD BE CONFIRMED WITH THE PRODUCTMANUFACTURER OR DISTRIBUTOR.

1. REFER TO APPROVED PLANS FORLOCATION, EXTENT AND CONSTRUCTIONDETAILS. IF THERE ARE QUESTIONS ORPROBLEMS WITH THE LOCATION, EXTENT, ORMETHOD OF INSTALLATION CONTACT THEENGINEER OR RESPONSIBLE ON-SITEOFFICER FOR ASSISTANCE.

2. TURF REINFORCEMENT MATS SHALL BESTORED AWAY FROM DIRECT SUNLIGHT ORCOVERED WITH ULTRAVIOLET LIGHTPROTECTIVE SHEETING UNTIL THE SITE ISREADY FOR THEIR INSTALLATION.

3. REMOVE ALL TREES, BRUSH, STUMPS, ANDOTHER OBJECTIONABLE MATERIAL FROM THEPROPOSED CHANNEL AREA AND DISPOSE OFPROPERLY.

4. EXCAVATE THE CHANNEL AND SHAPE IT TONEAT LINES AND DIMENSIONS AS SHOWN ONTHE APPROVED PLANS. OVER-CUT THECHANNEL 50mm IN DEPTH TO ALLOW FORBULKING DURING SEEDBED PREPARATIONSAND TURF BUILD-UP.

5. ENSURE ANY SURFACE IRREGULARITIESARE REMOVED.

6. IF THE CHANNEL IS TO BE GRASSED,PREPARE A SMOOTH SEED BED OFAPPROXIMATELY 75mm OF TOPSOIL, SEED,FERTILISE, WATER AND RAKE TO REMOVE ANYREMAINING SURFACE IRREGULARITIES.

7. REFER TO MANUFACTURER’S ADVICEREGARDING PLACEMENT OF SEED BEFOREOR AFTER PLACEMENT OF THE MATS.

8. EXCAVATE A 300mm DEEP BY 150mm WIDETRENCH ALONG THE FULL WIDTH OF THEUPSTREAM END OF THE AREA TO BE TREATED.

9. AT LEAST 300mm OF THE MAT IS ANCHOREDINTO THE TRENCH WITH THE ROLL OF

MATTING RESTING ON THE GROUNDUP-SLOPE OF THE TRENCH.

10. STAPLE THE FABRIC WITHIN THE TRENCHAT 200 TO 250mm SPACING USING 100mm WIDEBY 150mm PENETRATION LENGTH U-SHAPED, 8TO 11 GAUGE WIRE STAPLES. NARROWERU-SECTIONS MAY EASILY TEAR THE MATTINGWHEN PLACED UNDER STRESS.

11. IN LARGE DRAINAGE CHANNEL WHERE THEWIDTH OF THE CHANNEL IS MORE THAN THEWIDTH OF ONE MAT, INSTALL EACH PARALLELMAT SUCH THAT MAT HIGHER UP THECHANNEL BANK ALWAYS OVERLAPS THE MATLOWER DOWN THE BANK BY AT LEAST 300mm.THIS USUALLY REQUIRES THE MATS LOCATEDALONG THE CHANNEL BED TO BE UNROLLEDFIRST, FOLLOWED BY EACH CONSECUTIVEPARALLEL MAT LOCATED HIGHER UP THECHANNEL BANK.

12. WHEN ALL MATS HAVE BEEN ANCHOREDWITHIN THE TRENCH ACROSS THE FULL WIDTHOF THE TREATED AREA, THEN THE TRENCH ISBACKFILLED AND COMPACTED. THE MATS ARETHEN UNROLLED DOWN THE SLOPE SUCHTHAT EACH MAT COVERS AND PROTECTS THEBACKFILLED TRENCH.

13. WHEN SPREADING THE MATS, AVOIDSTRETCHING THE FABRIC. THE MATS SHOULDREMAIN IN GOOD CONTACT WITH THE SOIL.

14. IF THE CHANNEL CURVES, THEN SUITABLYFOLD (DOWNSTREAM DIRECTION) AND STAPLETHE FABRIC MAINTAINING THE FABRICPARALLEL TO THE DIRECTION OF FLOW.

15. STAPLE THE SURFACE OF THE MATTING AT1m CENTRES. ON IRREGULAR GROUND,ADDITIONAL STAPLES WILL BE REQUIREDWHEREVER THE MAT DOES NOT INITIALLYCONTACT THE GROUND SURFACE.

16. AT THE END OF EACH LENGTH OF MAT, ANEW TRENCH IS FORMED AT LEAST 300mmUP-SLOPE OF THE END OF THE MAT SUCHTHAT THE END OF THE MAT WILL BE ABLE TOFULLY COVER THE TRENCH. A NEW ROLL OFMATTING IS THEN ANCHORED WITHIN THISTRENCH AS PER THE FIRST MAT. AFTER THISNEW MAT HAS BEEN UNROLLED DOWN THESLOPE, THE UP-SLOPE MAT MAY BE PINNED INPLACE FULLY COVERING THE NEW TRENCH

AND AT LEAST 300mm OF THE DOWN-SLOPEMAT. THE PROCESS IS CONTINUED DOWN THESLOPE UNTIL THE DESIRED AREA IS FULLYCOVERED.

17. IN HIGH-VELOCITY CHANNELS, ADDITIONALANCHOR SLOTS MAY BE REQUIRED AT 10mINTERVALS DOWN THE CHANNEL.

18. ANCHOR THE OUTER MOST EDGES (TOPAND UPPER MOST SIDES) OF THE TREATEDAREA IN A 300mm DEEP TRENCH AND STAPLEAT 200 TO 250mm CENTRES.

19. ENSURE THE TURF EXTENDS UP THE SIDESOF THE CHANNEL AT LEAST 100mm ABOVE THEELEVATION OF THE CHANNEL BED, OR ATLEAST TO A SUFFICIENT ELEVATION TO FULLYCONTAIN EXPECTED ANY CHANNEL FLOWTHAT IS CONSIDERED LIKELY TO OCCURWITHIN THE FIRST MONTH AFTER PLACEMENT.

20. ON SLOPES OF 3:1(H:V) OR GREATER, ORWHEREVER EROSION MAY BE A PROBLEM, ORIN SITUATIONS WHERE HIGH FLOWVELOCITIES ARE LIKELY WITHIN 2-WEEKS OFPLACEMENT, SECURE THE INDIVIDUAL STRIPSWITH WOODEN PEGS.

21. IF SEEDING IS REQUIRED POSTPLACEMENT OF THE MATS, THEN APPLY SEEDAS PER SUPPLIER’S INSTRUCTIONS.

22. IF PRE-GROWN TURF IS USED, THENENSURE THAT INTIMATE CONTACT ISACHIEVED AND MAINTAINED BETWEEN THETURF REINFORCEMENT AND THE SOIL SUCHTHAT SEEPAGE FLOW BENEATH THE TURF ISAVOIDED. ONCE FIXED IN PLACE, THE MATSSHOULD BE ROLLED WITH A ROLLERWEIGHING 60 TO 90 kg/m WIDTH, THENWATERED AFTER GRASS SEEDING.

23. ENSURE THAT WATER ENTERING THECHANNEL WILL FLOW FREELY OVER THEFINISHED GRASS SURFACE.

24. ENSURE SURFACE WATER FLOWINGLATERALLY INTO THE CHANNEL WILL NOT BEDEFLECTED ALONG THE UP-SLOPE EDGE OFTHE TURF CAUSING SOIL EROSION.

25. DAMAGED MATTING SHALL BE REPAIREDOR REPLACED.

ADDITIONAL REQUIREMENTS ASSOCIATEDWITH USE NEAR AIRPORT PAVEMENTS1. ONLY EROSION MATS THAT ARE DOUBLENETTED SHALL BE ALLOWED WITHIN 3.0m OFANY AIRPORT PAVEMENT USED BY AIRCRAFTWITH THE EXCEPTION OF AIRPORTSCLASSIFIED AS AIR CARRIER ORCORPORATE/TRANSPORT. IF THE AIRPORT ISCLASSIFIED AS AN AIR CARRIER ORCORPORATE/TRANSPORT, THERE WILL BE NOEROSION MATS ALLOWED WITHIN 9.0m OFPAVEMENT USED BY AIRCRAFT.

2. ONLY BIODEGRADABLE ANCHORINGDEVICES SHALL BE ALLOWED IN THEINSTALLATION OF ANY EROSION MAT FORAIRPORT APPLICATIONS. NO METAL STAPLESWILL BE ALLOWED.

MAINTENANCE1. DURING THE INITIAL ROOT ESTABLISHMENTPERIOD, CHECK THE TREATED CHANNELAFTER EVERY RUNOFF-PRODUCING RAINFALLEVENT.

2. IF DAMAGE HAS OCCURRED, IMMEDIATELYINITIATE REPAIRS WITH TURF OR BY SEEDINGAS APPROPRIATE.

3. REMOVE ALL SIGNIFICANT SEDIMENT ORDEBRIS DEPOSITION TO MAINTAIN THEREQUIRED HYDRAULIC CAPACITY OF THECHANNEL.

4. MAINTAIN A HEALTHY AND VIGOROUS GRASSCONDITION WHENEVER AND WHEREVERPOSSIBLE, INCLUDING WATERING ANDFERTILISING AS NEEDED.

5. MAINTAIN A MINIMUM GRASS BLADE LENGTHOF 50mm.

6. MOWING SHOULD NOT BE ATTEMPTED UNTILTHE TURF IS FIRMLY ROOTED, USUALLY 2 TO 3WEEKS AFTER LAYING.

7. ALL REASONABLE MEASURES SHALL BETAKEN TO COLLECT GRASS CLIPPINGSIMMEDIATELY AFTER MOWING IF THEIRREMOVAL BY SUBSEQUENT CHANNEL FLOWSWOULD CONTAMINATE SENSITIVEDOWNSTREAM WATERWAYS OR OTHERWISECAUSE UNDESIRABLE ENVIRONMENTAL HARM.

Drain type Formed top width with or without bank Formed depth with or without bank

Type-AV 2.0 m 0.30 m

Type-BV 2.7 m 0.45 m

Type-CV 3.9 m 0.65 m

Constructed dimensions of triangular V-drains

Drain type Formed top width with or without bank Formed depth with or without bank

Type-A 1.6 m 0.30 m

Type-B 2.4 m 0.45 m

Type-C 3.6 m 0.65 m

Constructed dimensions of parabolic catch drains

Formed top width

Formed top width

Formed top width

INSTALLATION

1. REFER TO APPROVED PLANS FORLOCATION, EXTENT, AND CONSTRUCTIONDETAILS. IF THERE ARE QUESTIONS ORPROBLEMS WITH THE LOCATION, EXTENT,OR METHOD OF INSTALLATION, CONTACTTHE ENGINEER OR RESPONSIBLEON-SITE OFFICER FOR ASSISTANCE.

2. ENSURE ALL NECESSARY SOILTESTING (e.g. SOIL pH, NUTRIENTLEVELS) AND ANALYSIS HAS BEENCOMPLETED, AND REQUIRED SOILADJUSTMENTS PERFORMED PRIOR TOPLANTING.

3. CLEAR THE LOCATION FOR THE CATCHDRAIN, CLEARING ONLY WHAT IS NEEDEDTO PROVIDE ACCESS FOR PERSONNELAND EQUIPMENT FOR INSTALLATION.

4. REMOVE ROOTS, STUMPS, AND OTHERDEBRIS AND DISPOSE OF THEMPROPERLY. DO NOT USE DEBRIS TOBUILD THE BANK.

5. GRADE THE DRAIN TO THE SPECIFIEDSLOPE AND FORM THE ASSOCIATEDEMBANKMENT WITH COMPACTED FILL.NOTE THAT THE DRAIN INVERT MUSTFALL 10cm EVERY 10m FOR EACH 1% OFCHANNEL GRADIENT.

6. ENSURE THE SIDES OF THE CUT DRAINARE NO STEEPER THAN A 1.5:1 (H:V)SLOPE AND THE EMBANKMENT FILLSLOPES NO STEEPER THAN 2:1.

7. ENSURE THE COMPLETED DRAIN HASSUFFICIENT DEEP (AS SPECIFIED FORTHE TYPE OF DRAIN) MEASURED FROMTHE DRAIN INVERT TO THE TOP OF THEEMBANKMENT. WHERE NECESSARY, CUTTHE DRAIN SLIGHTLY DEEPER THAN THATSPECIFIED ON THE PLANS SUCH THAT

THE CORRECT CHANNEL DIMENSIONSARE ACHIEVED FOLLOWING PLACEMENTOF THE TURF.

8. ENSURE THE DRAIN HAS A CONSTANTFALL IN THE DESIRED DIRECTION FREEOF OBSTRUCTIONS.

9. TURF SHOULD BE USED WITHIN12-HOURS OF DELIVERY, OTHERWISEENSURE THE TURF IS STORED INCONDITIONS APPROPRIATE FOR THEWEATHER CONDITIONS (e.g. A SHADEDAREA).

10. MOISTENING THE TURF AFTER IT ISUNROLLED WILL HELP MAINTAIN ITSVIABILITY.

11. TURF SHOULD BE LAID ON A MINIMUM75mm BED OF ADEQUATELY FERTILISEDTOPSOIL. RAKE THE SOIL SURFACE TOBREAK THE CRUST JUST BEFORE LAYINGTHE TURF.

12. DURING THE WARMER MONTHS,LIGHTLY IRRIGATE THE SOILIMMEDIATELY BEFORE LAYING THE TURF.

13. ENSURE THE TURF IS NOT LAID ONGRAVEL, HEAVILY COMPACTED SOILS, ORSOILS THAT HAVE BEEN RECENTLYTREATED WITH HERBICIDES.

14. FOR WIDE DRAINS AND HIGHVELOCITY CHUTES, LAY THE FIRST ROWOF TURF IN A STRAIGHT LINE DIAGONALTO THE DIRECTION OF FLOW. STAGGERSUBSEQUENT ROWS IN A BRICK-LIKE(STRETCHER BOND) PATTERN. THE TURFSHOULD NOT BE STRETCHED OROVERLAPPED. USE A KNIFE OR SHARPSPADE TO TRIM AND FIT IRREGULARLYSHAPED AREAS.

15. FOR NARROW DRAINS, LAY THE TURFALONG THE DIRECTION OF THE DRAIN,ENSURING, WHEREVER PRACTICABLE,THAT A LONGITUDINAL JOINT BETWEENTWO STRIPS OF TURF IS NOTPOSITIONED ALONG THE INVERT OF THEDRAIN.

16. ENSURE THE TURF EXTENDS UP THESIDES OF THE DRAIN AT LEAST 100mmABOVE THE ELEVATION OF THE CHANNELINVERT, OR AT LEAST TO A SUFFICIENTELEVATION TO FULLY CONTAINEXPECTED CHANNEL FLOW.

17. ON CHANNEL GRADIENTS OF 3:1(H:V)OR STEEPER, OR IN SITUATIONS WHEREHIGH FLOW VELOCITIES (i.e. VELOCITY>1.5m/s) ARE LIKELY WITHIN THE FIRST2-WEEKS FOLLOWING PLACEMENT,SECURE THE INDIVIDUAL TURF STRIPSWITH WOODEN OR PLASTIC PEGS.

18. ENSURE THAT INTIMATE CONTACT ISACHIEVED AND MAINTAINED BETWEENTHE TURF AND THE SOIL SUCH THATSEEPAGE FLOW BENEATH THE TURF ISAVOIDED.

19. WATER UNTIL THE SOIL IS WET 100mmBELOW THE TURF. THEREAFTER,WATERING SHOULD BE SUFFICIENT TOMAINTAIN AND PROMOTE HEALTHYGROWTH.

20. ENSURE THE DRAIN DISCHARGES TOA STABLE OUTLET SUCH THATDOWN-SLOPE SOIL EROSION WILL BEPREVENTED FROM OCCURRING.ENSURE THE DRAIN DOES NOTDISCHARGE TO AN UNSTABLE FILLSLOPE.

MAINTENANCE

1. INSPECT ALL CATCH DRAINS AT LEASTWEEKLY AND AFTERRUNOFF-PRODUCING STORM EVENTSAND REPAIR ANY SLUMPS, BANKDAMAGE, OR LOSS OF FREEBOARD.

2. ENSURE FILL MATERIAL OR SEDIMENTIS NOT PARTIALLY BLOCKING THE DRAIN.WHERE NECESSARY, REMOVE ANYDEPOSITED MATERIAL TO ALLOW FREEDRAINAGE.

3. DISPOSE OF ANY SEDIMENT OR FILL INA MANNER THAT WILL NOT CREATE ANEROSION OR POLLUTION HAZARD.

REMOVAL

1. WHEN THE SOIL DISTURBANCE ABOVETHE CATCH DRAIN IS FINISHED AND THEAREA IS STABILISED, THE DRAIN AND ANYASSOCIATED BANKS SHOULD BEREMOVED, UNLESS IT IS TO REMAIN AS APERMANENT DRAINAGE FEATURE.

2. DISPOSE OF ANY SEDIMENT OR EARTHIN A MANNER THAT WILL NOT CREATE ANEROSION OR POLLUTION HAZARD.

3. GRADE THE AREA AND SMOOTH IT OUTIN PREPARATION FOR STABILISATION.

4. STABILISE THE AREA BY GRASSING ORAS SPECIFIED WITHIN THE APPROVEDPLAN.

INSTALLATION OF RISER PIPE

1. DRILL DE-WATERING HOLES IN THERISER AS SPECIFIED ON THE PLAN.

2. EXCAVATE ANTI-FLOTATION PIT.

3. SECURELY ATTACH THE RISER TOTHE CONDUIT OR CONDUIT STUB TOMAKE A WATERTIGHT STRUCTURALCONNECTION. SECURE ALLCONNECTIONS BETWEEN CONDUITSECTIONS BY APPROVEDWATERTIGHT ASSEMBLIES.

4. ATTACH THE ANTI-SEEP COLLARSTO THE CONDUIT AS SHOWN ON THEAPPROVED PLAN, OR OTHERWISE ASSPECIFIED.

5. PLACE THE CONDUIT AND RISERON A FIRM, SMOOTH FOUNDATION OFIMPERVIOUS SOIL. DO NOT USEPERVIOUS MATERIAL SUCH AS SAND,GRAVEL, OR CRUSHED ROCK ASBACKFILL AROUND THE CONDUIT ORANTI-SEEP COLLARS.

6. PLACE FILL MATERIAL AROUNDTHE CONDUIT IN 100mm LAYERS ANDCOMPACT AROUND THE PIPE TO ATLEAST THE SAME DENSITY AS THEADJACENT EMBANKMENT. ENSUREAPPROPRIATE CARE IS TAKEN NOTTO RAISE THE PIPE FROM FIRMCONTACT WITH ITS FOUNDATIONWHEN COMPACTING UNDER THEPIPE HAUNCHES.

7. PLACE A MINIMUM DEPTH OF600mm OF LIGHTLY COMPACTEDBACKFILL OVER THE CONDUITBEFORE CROSSING IT WITHCONSTRUCTION EQUIPMENT.

8. ANCHOR THE RISER IN PLACE BYCONCRETE OR OTHERSATISFACTORY MEANS TO PREVENTFLOTATION. ENSURE THEANTI-FLOTATION MASS IS AT LEAST110% OF WATER MASS DISPLACED BYTHE RISER PIPE OUTLET SYSTEM,INCLUDING THE VOLUME DISPLACEDBY THE ANTI-FLOTATION WEIGHT.

9. IN NO CASE SHOULD THE CONDUITBE INSTALLED BY CUTTING A TRENCHTHROUGH THE DAM AFTER THEEMBANKMENT IS COMPLETED.

10. ATTACH ANTI-VORTEX DEVICEAND TRASH GUARD TO RISER AND ASREQUIRED (REFER TOSPECIFICATIONS SHOWN ON THEAPPROVED PLANS).

MAINTENANCE

1. CHECK ALL VISIBLE PIPECONNECTIONS FOR LEAKS, ANDREPAIR AS NECESSARY.

2. REMOVE ALL TRASH AND OTHERDEBRIS FROM THE BASIN AND RISER.

3. SUBMERGED INFLOW PIPES MUSTBE INSPECTED AND DE-SILTED (ASREQUIRED) AFTER EACH INFLOWEVENT.

REMOVAL

1. DISPOSE OF ALL MATERIALS IN AMANNER THAT WILL NOT CREATE ANEROSION OR POLLUTION HAZARD.

MATERIALS

EARTH FILL: CLEAN SOIL WITH EMERSONCLASS 2(1), 3, 4, OR 5, AND FREE OF ROOTS,WOODY VEGETATION, ROCKS AND OTHERUNSUITABLE MATERIAL. SOIL WITH EMERSONCLASS 4 AND 5 MAY NOT BE SUITABLEDEPENDING ON PARTICLE SIZE DISTRIBUTIONAND DEGREE OF DISPERSION. CLASS 2(1)SHOULD ONLY BE USED UPONRECOMMENDATION FROM GEOTECHNICALSPECIALIST. THIS SPECIFICATION MAYBEREPLACED BY AN EQUIVALENT STANDARDBASED ON THE EXCHANGEABLE SODIUMPERCENTAGE.

RISER PIPE: MINIMUM 250mm DIAMETER.

SPILLWAY ROCK: HARD, ANGULAR, DURABLE,WEATHER RESISTANT AND EVENLY GRADEDROCK WITH 50% BY WEIGHT LARGER THANTHE SPECIFIED NOMINAL (d50) ROCK SIZE.LARGE ROCK SHOULD DOMINATE, WITHSUFFICIENT SMALL ROCK TO FILL THE VOIDSBETWEEN THE LARGER ROCK. THE DIAMETEROF THE LARGEST ROCK SIZE SHOULD BE NOLARGER THAN 1.5 TIMES THE NOMINAL ROCKSIZE. THE SPECIFIC GRAVITY SHOULD BE ATLEAST 2.5.

GEOTEXTILE FABRIC: HEAVY-DUTY,NEEDLE-PUNCHED, NON-WOVEN FILTERCLOTH, MINIMUM ‘BIDIM’ A24 OR EQUIVALENT.

CONSTRUCTION

1. NOTWITHSTANDING ANY DESCRIPTIONCONTAINED WITHIN THE APPROVED PLANS ORSPECIFICATIONS, THE CONTRACTOR SHALL BERESPONSIBLE FOR SATISFYING THEMSELVESAS TO THE NATURE AND EXTENT OF THESPECIFIED WORKS AND THE PHYSICAL ANDLEGAL CONDITIONS UNDER WHICH THEWORKS WILL BE CARRIED OUT. THIS SHALLINCLUDE MEANS OF ACCESS, EXTENT OFCLEARING, NATURE OF MATERIAL TO BEEXCAVATED, TYPE AND SIZE OF MECHANICALPLANT REQUIRED, LOCATION AND SUITABILITYOF WATER SUPPLY FOR CONSTRUCTION ANDTESTING PURPOSES, AND ANY OTHER LIKEMATTERS AFFECTING THE CONSTRUCTION OFTHE WORKS.

2. REFER TO APPROVED PLANS FORLOCATION, DIMENSIONS, AND CONSTRUCTIONDETAILS. IF THERE ARE QUESTIONS ORPROBLEMS WITH THE LOCATION, DIMENSIONS,OR METHOD OF INSTALLATION, CONTACT THEENGINEER OR RESPONSIBLE ON-SITEOFFICER FOR ASSISTANCE.

3. BEFORE STARTING ANY CLEARING ORCONSTRUCTION, ENSURE ALL THENECESSARY MATERIALS AND COMPONENTSARE ON THE SITE TO AVOID DELAYS INCOMPLETING THE POND ONCE WORKS BEGIN.

4. INSTALL REQUIRED SHORT-TERM SEDIMENTCONTROL MEASURES DOWNSTREAM OF THEPROPOSED EARTHWORKS TO CONTROLSEDIMENT RUNOFF DURING CONSTRUCTIONOF THE BASIN.

5. THE AREA TO BE COVERED BY THEEMBANKMENT, BORROW PITS AND INCIDENTALWORKS, TOGETHER WITH AN AREAEXTENDING BEYOND THE LIMITS OF EACH FORA DISTANCE NOT EXCEEDING FIVE (5) METRESALL AROUND MUST BE CLEARED OF ALLTREES, SCRUB, STUMPS, ROOTS, DEADTIMBER AND RUBBISH AND DISPOSED OF IN ASUITABLE MANNER. DELAY CLEARING THEMAIN POND AREA UNTIL THE EMBANKMENT ISCOMPLETE.

6. ENSURE ALL HOLES MADE BY GRUBBINGWITHIN THE EMBANKMENT FOOTPRINT AREFILLED WITH SOUND MATERIAL, ADEQUATELYCOMPACTED, AND FINISHED FLUSH WITH THENATURAL SURFACE.CUT-OFF TRENCH:

7. BEFORE CONSTRUCTION OF THE CUT-OFFTRENCH OR ANY ANCILLARY WORKS WITHINTHE EMBANKMENT FOOTPRINT, ALL GRASSGROWTH AND TOPSOIL MUST BE REMOVEDFROM THE AREA TO BE OCCUPIED BY THEEMBANKMENT AND MUST BE DEPOSITEDCLEAR OF THIS AREA AND RESERVED FORTOPDRESSING THE COMPLETING THEEMBANKMENT.

8. EXCAVATE A CUT-OFF TRENCH ALONG THECENTRE LINE OF THE EARTH FILLEMBANKMENT. CUT THE TRENCH TO STABLE

SOIL MATERIAL, BUT IN NO CASE MAKE IT LESSTHAN 600mm DEEP. THE CUT-OFF TRENCHMUST EXTEND INTO BOTH ABUTMENTS TO ATLEAST THE ELEVATION OF THE RISER PIPECREST. MAKE THE MINIMUM BOTTOM WIDTHWIDE ENOUGH TO PERMIT OPERATION OFEXCAVATION AND COMPACTION EQUIPMENT,BUT IN NO CASE LESS THAN 600mm. MAKE THESIDE SLOPES OF THE TRENCH NO STEEPERTHAN 1:1 (H:V).

9. ENSURE ALL WATER, LOOSE SOIL, ANDROCK ARE REMOVED FROM THE TRENCHBEFORE BACKFILLING COMMENCES. THECUT-OFF TRENCH MUST BE BACKFILLED WITHSELECTED EARTH-FILL OF THE TYPESPECIFIED FOR THE EMBANKMENT, AND THISSOIL MUST HAVE A MOISTURE CONTENT ANDDEGREE OF COMPACTION THE SAME AS THATSPECIFIED FOR THE SELECTED CORE ZONE.

10. MATERIAL EXCAVATED FROM THE CUT-OFFTRENCH MAY BE USED IN CONSTRUCTION OFTHE EMBANKMENT PROVIDED IT IS SUITABLEAND IT IS PLACED IN THE CORRECT ZONEACCORDING TO ITS CLASSIFICATION.

EMBANKMENT:

11. SCARIFY AREAS ON WHICH FILL IS TO BEPLACED BEFORE PLACING THE FILL.

12. ENSURE ALL FILL MATERIAL USED TO FORMTHE EMBANKMENT MEETS THESPECIFICATIONS CERTIFIED BY A SOILSCIENTIST OR GEOTECHNICAL SPECIALIST.

13. THE FILL MATERIAL MUST CONTAINSUFFICIENT MOISTURE SO IT CAN BE FORMEDBY HAND INTO A BALL WITHOUT CRUMBLING.IF WATER CAN BE SQUEEZED OUT OF THEBALL, IT IS TOO WET FOR PROPERCOMPACTION. PLACE FILL MATERIAL IN 150 TO250mm CONTINUOUS LAYERS OVER THEENTIRE LENGTH OF THE FILL AREA AND THENCOMPACT BEFORE PLACEMENT OF FURTHERFILL.

14. PLACE RISER PIPE OUTLET SYSTEM, IFSPECIFIED, IN APPROPRIATE SEQUENCE WITHTHE EMBANKMENT FILLING. REFER TOSEPARATE INSTALLATION SPECIFICATIONS.

15. UNLESS OTHERWISE SPECIFIED ON THEAPPROVED PLANS, COMPACT THE SOIL ATABOUT 1% TO 2% WET OF OPTIMUM AND TO95% MODIFIED OR 100% STANDARDCOMPACTION.

16. WHERE BOTH DISPERSIVE ANDNON-DISPERSIVE CLASSIFIED EARTH-FILLMATERIALS ARE AVAILABLE, NON-DISPERSIVEEARTH-FILL MUST BE USED IN THE COREZONE. THE REMAINING CLASSIFIEDEARTH-FILL MATERIALS MUST ONLY BE USEDAS DIRECTED BY [INSERT TITLE].

17. WHERE SPECIFIED, CONSTRUCT THEEMBANKMENT TO AN ELEVATION 10% HIGHERTHAN THE DESIGN HEIGHT TO ALLOW FORSETTLING; OTHERWISE FINISHED DIMENSIONSOF THE EMBANKMENT AFTER SPREADING OFTOPSOIL MUST CONFORM TO THE DRAWINGWITH A TOLERANCE OF 75mm FROM THESPECIFIED DIMENSIONS.

18. ENSURE DEBRIS AND OTHER UNSUITABLEBUILDING WASTE IS NOT PLACED WITHIN THEEARTH EMBANKMENT.

19. AFTER COMPLETION OF THE EMBANKMENTALL LOOSE UNCOMPACTED EARTH-FILLMATERIAL ON THE UPSTREAM ANDDOWNSTREAM BATTER MUST BE REMOVEDPRIOR TO SPREADING OF TOPSOIL.

20. TOPSOIL AND REVEGETATE/STABILISED ALLEXPOSED EARTH AS DIRECTED WITHIN THEAPPROVED PLANS.

(continued on SB-06)

SPILLWAY CONSTRUCTION: 21. THE SPILLWAY MUST BE EXCAVATED ASSHOWN ON THE PLANS, AND THE EXCAVATEDMATERIAL IF CLASSIFIED AS SUITABLE, MUSTBE USED IN THE EMBANKMENT, AND IF NOTSUITABLE IT MUST BE DISPOSED OF INTOSPOIL HEAPS.

22. ENSURE EXCAVATED DIMENSIONS ALLOWADEQUATE BOXING-OUT SUCH THAT THESPECIFIED ELEVATIONS, GRADES, CHUTEWIDTH, AND ENTRANCE AND EXIT SLOPES FORTHE EMERGENCY SPILLWAY WILL BEACHIEVED AFTER PLACEMENT OF THE ROCKOR OTHER SCOUR PROTECTION MEASURESAS SPECIFIED IN THE PLANS.

23. PLACE SPECIFIED SCOUR PROTECTIONMEASURES ON THE EMERGENCY SPILLWAY.ENSURE THE FINISHED GRADE BLENDS WITHTHE SURROUNDING AREA TO ALLOW ASMOOTH FLOW TRANSITION FROM SPILLWAYTO DOWNSTREAM CHANNEL.

24. IF A SYNTHETIC FILTER FABRIC UNDERLAYIS SPECIFIED, PLACE THE FILTER FABRICDIRECTLY ON THE PREPARED FOUNDATION. IFMORE THAN ONE SHEET OF FILTER FABRIC ISREQUIRED, OVERLAP THE EDGES BY AT LEAST300mm AND PLACE ANCHOR PINS AT MINIMUM1m SPACING ALONG THE OVERLAP. BURY THEUPSTREAM END OF THE FABRIC A MINIMUM300mm BELOW GROUND AND WHERENECESSARY, BURY THE LOWER END OF THEFABRIC OR OVERLAP A MINIMUM 300mm OVERTHE NEXT DOWNSTREAM SECTION ASREQUIRED. ENSURE THE FILTER FABRICEXTENDS AT LEAST 1000mm UPSTREAM OFTHE SPILLWAY CREST.

25. TAKE CARE NOT TO DAMAGE THE FABRICDURING OR AFTER PLACEMENT. IF DAMAGEOCCURS, REMOVE THE ROCK AND REPAIR THESHEET BY ADDING ANOTHER LAYER OF FABRICWITH A MINIMUM OVERLAP OF 300mm AROUNDTHE DAMAGED AREA. IF EXTENSIVE DAMAGEIS SUSPECTED, REMOVE AND REPLACE THEENTIRE SHEET.

26. WHERE LARGE ROCK IS USED, ORMACHINE PLACEMENT IS DIFFICULT, AMINIMUM 100mm LAYER OF FINE GRAVEL,

AGGREGATE, OR SAND MAY BE NEEDED TOPROTECT THE FABRIC.

27. PLACEMENT OF ROCK SHOULD FOLLOWIMMEDIATELY AFTER PLACEMENT OF THEFILTER FABRIC. PLACE ROCK SO THAT ITFORMS A DENSE, WELL-GRADED MASS OFROCK WITH A MINIMUM OF VOIDS. THEDESIRED DISTRIBUTION OF ROCKTHROUGHOUT THE MASS MAY BE OBTAINEDBY SELECTIVE LOADING AT THE QUARRY ANDCONTROLLED DUMPING DURING FINALPLACEMENT.

28. THE FINISHED SLOPE SHOULD BE FREE OFPOCKETS OF SMALL ROCK OR CLUSTERS OFLARGE ROCKS. HAND PLACING MAY BENECESSARY TO ACHIEVE THE PROPERDISTRIBUTION OF ROCK SIZES TO PRODUCE ARELATIVELY SMOOTH, UNIFORM SURFACE.THE FINISHED GRADE OF THE ROCK SHOULDBLEND WITH THE SURROUNDING AREA. NOOVERFALL OR PROTRUSION OF ROCK SHOULDBE APPARENT.

29. ENSURE THAT THE FINAL ARRANGEMENTOF THE SPILLWAY CREST WILL NOT PROMOTEEXCESSIVE FLOW THROUGH THE ROCK SUCHTHAT THE WATER CAN BE RETAINED WITHINTHE SETTLING BASIN AN ELEVATION NO LESSTHAN 50mm ABOVE OR BELOW THENOMINATED SPILLWAY CREST ELEVATION.ESTABLISHMENT OF SETTLING POND:

30. THE AREA TO BE COVERED BY THESTORED WATER OUTSIDE THE LIMITS OF THEBORROW PITS MUST BE CLEARED OF ALLSCRUB AND RUBBISH. TREES MUST BE CUTDOWN STUMP HIGH AND REMOVED FROM THEIMMEDIATE VICINITY OF THE WORK.

31. ESTABLISH ALL REQUIRED INFLOW CHUTESAND INLET BAFFLES, IF SPECIFIED, TO ENABLEWATER TO DISCHARGE INTO THE BASIN IN AMANNER THAT WILL NOT CAUSE SOIL EROSIONOR THE RE-SUSPENSION OF SETTLEDSEDIMENT.

32. INSTALL A SEDIMENT STORAGE LEVELMARKER POST WITH A CROSS MEMBER SETJUST BELOW THE TOP OF THE SEDIMENTSTORAGE ZONE (AS SPECIFIED ON THE

APPROVED PLANS). USE AT LEAST A 75mmWIDE POST FIRMLY SET INTO THE BASINFLOOR.

33. IF SPECIFIED, INSTALL INTERNAL SETTLINGPOND BAFFLES. ENSURE THE CREST OFTHESE BAFFLES IS SET LEVEL WITH, OR JUSTBELOW, THE ELEVATION OF THE EMERGENCYSPILLWAY CREST.

34. INSTALL ALL APPROPRIATE MEASURES TOMINIMISE SAFETY RISK TO ON-SITEPERSONNEL AND THE PUBLIC CAUSED BY THEPRESENCE OF THE SETTLING POND. AVOIDSTEEP, SMOOTH INTERNAL SLOPES.APPROPRIATELY FENCE THE SETTLING PONDAND POST WARNING SIGNS IF UNSUPERVISEDPUBLIC ACCESS IS LIKELY OR THERE ISCONSIDERED TO BE AN UNACCEPTABLE RISKTO THE PUBLIC.

MAINTENANCE OF SEDIMENT BASIN1. INSPECT THE SEDIMENT BASIN DURING THEFOLLOWING PERIODS:

(i) DURING CONSTRUCTION TO DETERMINEWHETHER MACHINERY, FALLING TREES, ORCONSTRUCTION ACTIVITY HAS DAMAGED ANYCOMPONENTS OF THE SEDIMENT BASIN. IFDAMAGE HAS OCCURRED, REPAIR IT.

(ii) AFTER EACH RUNOFF EVENT. INSPECT THEEROSION DAMAGE AT FLOW ENTRY AND EXITPOINTS. IF DAMAGE HAS OCCURRED, MAKETHE NECESSARY REPAIRS.

(iii) AT LEAST WEEKLY DURING THE NOMINATEDWET SEASON (IF ANY) OTHERWISE AT LEASTFORTNIGHTLY.

(iv) PRIOR TO, AND IMMEDIATELY AFTER,PERIODS OF ‘STOP WORK’ OR SITESHUTDOWN.

2. CLEAN OUT ACCUMULATED SEDIMENTWHEN IT REACHES THE MARKER BOARD/POST,AND RESTORE THE ORIGINAL STORAGEVOLUME. PLACE SEDIMENT IN A DISPOSALAREA OR, IF APPROPRIATE, MIX WITH DRY SOILON THE SITE.

3. DO NOT DISPOSE OF SEDIMENT IN AMANNER THAT WILL CREATE AN EROSION ORPOLLUTION HAZARD.

4. CHECK ALL VISIBLE PIPE CONNECTIONSFOR LEAKS, AND REPAIR AS NECESSARY.

5. CHECK ALL EMBANKMENTS FOR EXCESSIVESETTLEMENT, SLUMPING OF THE SLOPES ORPIPING BETWEEN THE CONDUIT AND THEEMBANKMENT; MAKE ALL NECESSARYREPAIRS.

6. REMOVE ALL TRASH AND OTHER DEBRISFROM THE BASIN AND RISER.

7. SUBMERGED INFLOW PIPES MUST BEINSPECTED AND DE-SILTED (AS REQUIRED)AFTER EACH INFLOW EVENT.

REMOVAL OF SEDIMENT BASIN1. WHEN GRADING AND CONSTRUCTION INTHE DRAINAGE AREA ABOVE A TEMPORARYSEDIMENT BASIN IS COMPLETED AND THEDISTURBED AREAS ARE ADEQUATELYSTABILISED, THE BASIN MUST BE REMOVEDOR OTHERWISE INCORPORATED INTO THEPERMANENT STORMWATER DRAINAGESYSTEM. IN EITHER CASE, SEDIMENT SHOULDBE CLEARED AND PROPERLY DISPOSED OFAND THE BASIN AREA STABILISED.

2. BEFORE STARTING ANY MAINTENANCEWORK ON THE BASIN OR SPILLWAY, INSTALLALL NECESSARY SHORT-TERM SEDIMENTCONTROL MEASURES DOWNSTREAM OF THESEDIMENT BASIN.

3. ALL WATER AND SEDIMENT MUST BEREMOVED FROM THE BASIN PRIOR TO THEDAM’S REMOVAL. DISPOSE OF SEDIMENT ANDWATER IN A MANNER THAT WILL NOT CREATEAN EROSION OR POLLUTION HAZARD.

4. BRING THE DISTURBED AREA TO A PROPERGRADE, THEN SMOOTH, COMPACT, ANDSTABILISE AND/OR REVEGETATE AS REQUIREDTO ESTABLISH A STABLE LAND SURFACE.

MATERIALS

FABRIC: POLYPROPYLENE, POLYAMIDE,NYLON, POLYESTER, OR POLYETHYLENEWOVEN OR NON-WOVEN FABRIC, AT LEAST700mm IN WIDTH AND A MINIMUM UNIT WEIGHTOF 140GSM. ALL FABRICS TO CONTAINULTRAVIOLET INHIBITORS AND STABILISERSTO PROVIDE A MINIMUM OF 6 MONTHS OFUSEABLE CONSTRUCTION LIFE (ULTRAVIOLETSTABILITY EXCEEDING 70%).

FABRIC REINFORCEMENT: WIRE OR STEELMESH MINIMUM 14-GAUGE WITH A MAXIMUMMESH SPACING OF 200mm.

SUPPORT POSTS/STAKES: 1500mm2 (MIN)HARDWOOD, 2500mm2 (MIN) SOFTWOOD, OR1.5kg/m (MIN) STEEL STAR PICKETS SUITABLEFOR ATTACHING FABRIC.

INSTALLATION

1. REFER TO APPROVED PLANS FOR LOCATION,EXTENT, AND REQUIRED TYPE OF FABRIC (IFSPECIFIED). IF THERE ARE QUESTIONS ORPROBLEMS WITH THE LOCATION, EXTENT,FABRIC TYPE, OR METHOD OF INSTALLATIONCONTACT THE ENGINEER OR RESPONSIBLEON-SITE OFFICER FOR ASSISTANCE.

2. TO THE MAXIMUM DEGREE PRACTICAL, ANDWHERE THE PLANS ALLOW, ENSURE THEFENCE IS LOCATED:(i) TOTALLY WITHIN THE PROPERTYBOUNDARIES;(ii) ALONG A LINE OF CONSTANT ELEVATIONWHEREVER PRACTICAL;(iii) AT LEAST 2m FROM THE TOE OF ANYFILLING OPERATIONS THAT MAY RESULT INSHIFTING SOIL/FILL DAMAGING THE FENCE.

3. INSTALL RETURNS WITHIN THE FENCE ATMAXIMUM 20m INTERVALS IF THE FENCE ISINSTALLED ALONG THE CONTOUR, OR 5 TO10m MAXIMUM SPACING (DEPENDING ONSLOPE) IF THE FENCE IS INSTALLED AT ANANGLE TO THE CONTOUR. THE ‘RETURNS’SHALL CONSIST OF EITHER:(i) V-SHAPED SECTION EXTENDING AT LEAST1.5m UP THE SLOPE; OR(ii) SANDBAG OR ROCK/AGGREGATE CHECK

DAM A MINIMUM 1/3 AND MAXIMUM 1/2 FENCEHEIGHT, AND EXTENDING AT LEAST 1.5m UPTHE SLOPE.

4. ENSURE THE EXTREME ENDS OF THEFENCE ARE TURNED UP THE SLOPE AT LEAST1.5m, OR AS NECESSARY, TO MINIMISE WATERBYPASSING AROUND THE FENCE.

5. ENSURE THE SEDIMENT FENCE ISINSTALLED IN A MANNER THAT AVOIDS THECONCENTRATION OF FLOW ALONG THEFENCE, AND THE UNDESIRABLE DISCHARGEOF WATER AROUND THE ENDS OF THE FENCE.

6. IF THE SEDIMENT FENCE IS TO BEINSTALLED ALONG THE EDGE OF EXISTINGTREES, ENSURE CARE IS TAKEN TO PROTECTTHE TREES AND THEIR ROOT SYSTEMSDURING INSTALLATION OF THE FENCE. DONOT ATTACH THE FABRIC TO THE TREES.

7. UNLESS DIRECTED BY THE SITESUPERVISOR OR THE APPROVED PLANS,EXCAVATE A 200mm WIDE BY 200mm DEEPTRENCH ALONG THE PROPOSED FENCE LINE,PLACING THE EXCAVATED MATERIAL ON THEUP-SLOPE SIDE OF THE TRENCH.

8. ALONG THE LOWER SIDE OF THE TRENCH,APPROPRIATELY SECURE THE STAKES INTOTHE GROUND SPACED NO GREATER THAN 3mIF SUPPORTED BY A TOP SUPPORT WIRE ORWEIR MESH BACKING, OTHERWISE NOGREATER THAN 2m.

9. IF SPECIFIED, SECURELY ATTACH THESUPPORT WIRE OR MESH TO THE UP-SLOPESIDE OF THE STAKES WITH THE MESHEXTENDING AT LEAST 200mm INTO THEEXCAVATED TRENCH. ENSURE THE MESH ANDFABRIC IS ATTACHED TO THE UP-SLOPE SIDEOF THE STAKES EVEN WHEN DIRECTING AFENCE AROUND A CORNER OR SHARPCHANGE OF DIRECTION.

10. WHEREVER POSSIBLE, CONSTRUCT THESEDIMENT FENCE FROM A CONTINUOUS ROLLOF FABRIC. TO JOIN FABRIC EITHER:(i) ATTACH EACH END TO TWO OVERLAPPINGSTAKES WITH THE FABRIC FOLDING AROUNDTHE ASSOCIATED STAKE ONE TURN, AND WITH

THE TWO STAKES TIED TOGETHER WITH WIRE;OR(ii) OVERLAP THE FABRIC TO THE NEXTADJACENT SUPPORT POST.

11. SECURELY ATTACH THE FABRIC TO THESUPPORT POSTS USING 25 X 12.5mm STAPLES,OR TIE WIRE AT MAXIMUM 150mm SPACING.

12. SECURELY ATTACH THE FABRIC TO THESUPPORT WIRE/MESH (IF ANY) AT A MAXIMUMSPACING OF 1m.

13. ENSURE THE COMPLETED SEDIMENTFENCE IS AT LEAST 450mm, BUT NOT MORETHAN 700mm HIGH. IF A SPILL-THOUGH WEIRIS INSTALLED, ENSURE THE CREST OF THEWEIR IS AT LEAST 300mm ABOVE GROUNDLEVEL.

14. BACKFILL THE TRENCH AND TAMP THE FILLTO FIRMLY ANCHOR THE BOTTOM OF THEFABRIC AND MESH TO PREVENT WATER FROMFLOWING UNDER THE FENCE.

ADDITIONAL REQUIREMENTS FOR THEINSTALLATION OF A SPILL-THROUGH WEIR

1. LOCATE THE SPILL-THROUGH WEIR SUCHTHAT THE WEIR CREST WILL BE LOWER THANTHE GROUND LEVEL AT EACH END OF THEFENCE.

2. ENSURE THE CREST OF THESPILL-THROUGH WEIR IS AT LEAST 300mm THEGROUND ELEVATION.

3. SECURELY TIE A HORIZONTAL CROSSMEMBER (WEIR) TO THE SUPPORT POSTS/STAKES EACH SIDE OF THE WEIR. CUT THEFABRIC DOWN THE SIDE OF EACH POST ANDFOLD THE FABRIC OVER THE CROSS MEMBERAND APPROPRIATELY SECURE THE FABRIC.

4. INSTALL A SUITABLE SPLASH PAD AND/ORCHUTE IMMEDIATELY DOWN-SLOPE OF THESPILL-THROUGH WEIR TO CONTROL SOILEROSION AND APPROPRIATELY DISCHARGETHE CONCENTRATED FLOW PASSING OVERTHE WEIR.

MAINTENANCE

1. INSPECT THE SEDIMENT FENCE AT LEASTWEEKLY AND AFTER ANY SIGNIFICANT RAIN.MAKE NECESSARY REPAIRS IMMEDIATELY.

2. REPAIR ANY TORN SECTIONS WITH ACONTINUOUS PIECE OF FABRIC FROM POSTTO POST.

3. WHEN MAKING REPAIRS, ALWAYS RESTORETHE SYSTEM TO ITS ORIGINALCONFIGURATION UNLESS AN AMENDEDLAYOUT IS REQUIRED OR SPECIFIED.

4. IF THE FENCE IS SAGGING BETWEENSTAKES, INSTALL ADDITIONAL SUPPORTPOSTS.

5. REMOVE ACCUMULATED SEDIMENT IF THESEDIMENT DEPOSIT EXCEEDS A DEPTH OF 1/3THE HEIGHT OF THE FENCE.

6. DISPOSE OF SEDIMENT IN A SUITABLEMANNER THAT WILL NOT CAUSE AN EROSIONOR POLLUTION HAZARD.

7. REPLACE THE FABRIC IF THE SERVICE LIFEOF THE EXISTING FABRIC EXCEEDS6-MONTHS.

REMOVAL

1. WHEN DISTURBED AREAS UP-SLOPE OF THESEDIMENT FENCE ARE SUFFICIENTLYSTABILISED TO RESTRAIN EROSION, THEFENCE MUST BE REMOVED.

2. REMOVE MATERIALS AND COLLECTEDSEDIMENT AND DISPOSE OF IN A SUITABLEMANNER THAT WILL NOT CAUSE AN EROSIONOR POLLUTION HAZARD.

3. REHABILITATE/REVEGETATE THEDISTURBED GROUND AS NECESSARY TOMINIMISE THE EROSION HAZARD.

Sedimentpond

MATERIALS

SOCKS: MINIMUM 200mm DIAMETERSYNTHETIC OR BIODEGRADABLE TUBESMANUFACTURED FROM NON-WOVEN ORCOMPOSITE FABRIC SUITABLE FOR THE‘FILTRATION’ OF COARSE SEDIMENTS.

FILL MATERIAL: STRAW, CANE MULCH,COMPOSTED MATERIAL (AS4454),COARSE SAND, OR CLEAN AGGREGATE.

STAKES: MINIMUM 25 x 25mm TIMBER.

INSTALLATION1. REFER TO APPROVED PLANS FORLOCATION AND INSTALLATION DETAILS.IF THERE ARE QUESTIONS OR PROBLEMSWITH THE LOCATION, DIMENSIONS ORMETHOD OF INSTALLATION CONTACT THEENGINEER OR RESPONSIBLE ON-SITEOFFICER FOR ASSISTANCE.

2. ENSURE THE SOCKS ARE PLACEDINDIVIDUALLY OR COLLECTIVELY (AS ASINGLE SEDIMENT TRAP) SUCH THAT:(i) LEAKAGE AROUND OR UNDER THESOCKS IS MINIMISED;(ii) ADJOINING SOCKS ARE TIGHTLYBUTTED OR OVERLAPPED AT LEAST450mm;(iii) THE SURFACE AREA OF POTENTIALWATER PONDING UP-SLOPE OF EACHSEDIMENT TRAP IS MAXIMISED;(iv) TO THE MAXIMUM DEGREEPRACTICAL, ALL SEDIMENT-LADENWATER WILL PASS THROUGH THEFORMED POND BEFORE FLOWING OVERTHE DOWN-SLOPE END OF THESEDIMENT TRAP.

3. WHEN PLACED ACROSS THE INVERTOF MINOR DRAINS, ENSURE THE SOCKSARE PLACED SUCH THAT:(i) THE CREST OF THE DOWNSTREAMSOCK IS LEVEL WITH THE CHANNELINVERT AT THE IMMEDIATE UPSTREAMSOCK (IF ANY);

(ii) EACH SOCK EXTENDS UP THECHANNEL BANKS SUCH THAT THE CRESTOF THE SOCK AT ITS LOWEST POINT ISLOWER THAN GROUND LEVEL AT EITHEREND OF THE SOCK.

4. IF STAKES ARE REQUIRED TO ANCHORTHE SOCKS, THEIR SPACING DOES NOTEXCEEDING 1.2m OR SIX TIMES THESOCK DIAMETER (WHICHEVER IS THELESSER). A MAXIMUM STAKE SPACING OF0.3m APPLIES WHEN USED TO FORMCHECK DAMS.

MAINTENANCE1. INSPECT ALL FILTER SOCKS PRIOR TOFORECAST RAIN, DAILY DURINGEXTENDED PERIODS OF RAINFALL,AFTER SIGNIFICANT RUNOFFPRODUCING STORMS OR OTHERWISE ATWEEKLY INTERVALS.

2. REPAIR OR REPLACE DAMAGEDSOCKS.

3. THE BULK OF THE SEDIMENTCOLLECTED BEHIND THE FILTER SOCKSSHOULD BE REMOVED BY SHOVEL AFTEREACH STORM EVENT.

4. REMOVE COLLECTED SEDIMENT ANDDISPOSE OF IN A SUITABLE MANNERTHAT WILL NOT CAUSE AN EROSION ORPOLLUTION HAZARD.

REMOVAL1. ALL SAND, SOIL, SEDIMENT OR MUDMUST BE PHYSICALLY REMOVED FROMSEALED SURFACES, FIRST USING ASQUARE-EDGED SHOVEL, AND THEN ASTIFF-BRISTLED BROOM, AND THEN BY AMECHANICAL VACUUM UNIT, IFAVAILABLE.

2. IF NECESSARY FOR SAFETY REASONS,THE SEALED SURFACE SHALL ONLY BE

WASHED CLEAN AFTER ALL REASONABLEEFFORTS HAVE BEEN TAKEN TO SHOVELAND SWEEP THE MATERIAL FROM THESURFACE.

3. DISPOSE OF COLLECTED SEDIMENT INA SUITABLE MANNER THAT WILL NOTCAUSE AN EROSION OR POLLUTIONHAZARD.

4. ALL SYNTHETIC (PLASTIC) MESH OROTHER NON READILY BIODEGRADABLEMATERIAL MUST BE REMOVED FROM THESITE ONCE THE SLOPE OR DRAIN ISSTABILISED, OR THE SOCKS HAVEDETERIORATED TO A POINT WHERE THEYARE NO LONGER PROVIDING THEIRINTENDED DRAINAGE OR SEDIMENTCONTROL FUNCTION.

INSTALLATION

1. REFER TO APPROVED PLANS FORLOCATION, EXTENT AND CONSTRUCTIONDETAILS. IF THERE ARE QUESTIONS ORPROBLEMS WITH THE LOCATION, EXTENT,OR METHOD OF INSTALLATION CONTACTTHE ENGINEER OR RESPONSIBLEON-SITE OFFICER FOR ASSISTANCE.

2. ENSURE ALL NECESSARY SOILTESTING (e.g. SOIL pH, NUTRIENTLEVELS) HAS BEEN COMPLETED, ANDREQUIRED SOIL ADJUSTMENTSPERFORMED, PRIOR TO PLANTING.

3. REMOVE ALL OBJECTIONABLEMATERIAL FROM THE AREA TO BETURFED.

4. ALL TURF SHOULD BE USED WITHIN12-HOURS OF DELIVERY, OTHERWISEENSURE THE TURF IS STORED INCONDITIONS APPROPRIATE FOR THEWEATHER CONDITIONS.

5. MOISTENING THE TURF AFTER IT ISUNROLLED WILL HELP MAINTAIN ITSVIABILITY.

6. TURF SHOULD BE LAID ON A MINIMUM75mm BED OF ADEQUATELY FERTILISEDTOPSOIL. RAKE THE SOIL SURFACE TOBREAK THE CRUST JUST BEFORE LAYINGTHE TURF.

7. ENSURE THE TURF IS NOT LAID ONGRAVEL, HEAVILY COMPACTED SOILS, ORSOILS THAT HAVE BEEN RECENTLYTREATED WITH HERBICIDES.

8. ENSURE THAT INTIMATE CONTACT ISACHIEVED AND MAINTAINED BETWEENTHE TURF AND THE SOIL SUCH THATSEEPAGE FLOW BENEATH THE TURF ISAVOIDED.9. IF THE FILTER STRIPS ARE REQUIRED

TO BE PLACED ALONG THE CONTOUR,THEN ENSURE EACH ROW OF TURF ISPLACED ALONG A LINE OF CONSTANTLAND ELEVATION.

10. IF THE FILTER STRIPS ARE PLACED ATAN ANGLE TO THE LAND SLOPE (i.e. SUCHTHAT UP-SLOPE RUNOFF WILL BEDEFLECTED ALONG THE UPPER EDGE OFTHE TURF), THEN LATERAL STRIPS OFTURF MUST BE PLACED AT MAXIMUM 5mINTERVALS AND EXTENDING AT LEAST400mm UP-SLOPE OF THE FILTER STRIP.

11. WATER UNTIL THE SOIL IS WET 100mmBELOW THE TURF. THEREAFTER,WATERING SHOULD BE SUFFICIENT TOMAINTAIN AND PROMOTE HEALTHYGROWTH.

MAINTENANCE

1. INSPECT THE GRASS FILTER STRIPSAFTER EACH RUNOFF EVENT. CHECKFOR EVIDENCE OF CONCENTRATEDRILL-FORMING FLOW ALONG THE UPPEREDGE OF THE TURF.

2. IF EXCESSIVE EROSION IS OCCURRINGALONG THE UP-SLOPE EDGE OF THETURF, THEN PLACE ADDITIONALDIAGONAL TURF STRIPS. ALTERNATIVELY,USE SANDBAGS TO APPROPRIATELYDIVERT RUNOFF THROUGH THE GRASS.

3. MAINTAIN A HEALTHY AND VIGOROUSGRASS CONDITION WHENEVER ANDWHEREVER POSSIBLE, INCLUDINGWATERING AND FERTILISING AS NEEDED.

4. WHERE PRACTICABLE, MAINTAIN AMINIMUM LEAF LENGTH OF 50mm.MOWING SHOULD NOT BE ATTEMPTEDUNTIL THE TURF IS FIRMLY ROOTED,USUALLY 2 TO 3 WEEKS AFTER LAYING.

4


APPENDIXAPPENDIXAPPENDIXAPPENDIX DDDD:::: CCCCALCULATIONSALCULATIONSALCULATIONSALCULATIONS

Appendix D | November 2010

Clean Water Diversion Drain Design CalcClean Water Diversion Drain Design CalcClean Water Diversion Drain Design CalcClean Water Diversion Drain Design Calculationsulationsulationsulations

Overal l Design CriteriaOveral l Design CriteriaOveral l Design CriteriaOveral l Design Criteria

• Upstream Catchment Area = 16 Ha

• Length of Flow = 580 m

• Upstream Grade = 6% (Estimated from Topographical Map)

• Time of Concentration = 10 mins (Calculated using the Common Slope Method velocity of 0.9 m/s)

• AFD for Townsville 10min 5 year = 156 mm

• Minimum depth 300mm

• Minimum width 1.5m

• Mannings value = 0.19 to 0.023 (0.02 adopted)

Runnoff CalculationRunnoff CalculationRunnoff CalculationRunnoff Calculation

Qy = k Cy Itcy A

Where:

y = Reccurance Interval in years

Qy = peak flow rate for y years

Cy = runoff coefficient for y years

Itcy = average rainfall intensity for tc hours and y years

k = dimensionless conversion factor (0.00278 for Ha)


Sizing of Clean Water Diversion DrainSizing of Clean Water Diversion DrainSizing of Clean Water Diversion DrainSizing of Clean Water Diversion Drain

Runnoff CalculationRunnoff CalculationRunnoff CalculationRunnoff Calculation

Qy = k Cy Itcy A

Qy = 4.16 m³/sec

Drain SizingDrain SizingDrain SizingDrain Sizing –––– Flat Bottom Trapezoidal Flat Bottom Trapezoidal Flat Bottom Trapezoidal Flat Bottom Trapezoidal

F inal Channel DimensionFinal Channel DimensionFinal Channel DimensionFinal Channel Dimensionssss::::

Discharge Q = 4.16 m3/sec

Channel Slope S = 4%

Bank Slope m = 6 or 6:1 H:V

Maximum design flow depth y = 0.24m

Freeboard = 0.15m

Excavated Channel Depth = 0.25m + 0.15m = 0.4m

Total width of Channel = 2.4m + 4m + 2.4 = 8.8m

Velocity (Calculated) = 3.1m/s

Due to the Velocity – Reinforce Turf will be required to reinforce the channel

and prevent and scouring etc. The Turf needs to be pegged to the soil

surface and treatment may be required to ensure the underlying soils are

suitable for growing vegetation.


Sediment Basin Design Calc’s

Overal l Design CriteriaOveral l Design CriteriaOveral l Design CriteriaOveral l Design Criteria

• As some dispersive soils will be encountered a Type D sediment basin will be required.

• Expected design life of the sediment basins is 6 months or less.

• The basin will be discharging to the reef which is considered sensitive receiving waters.

o Y% = 85%

o K1 = 23.2

o K2 = 12.6

(as per Table B4 – Best Practice Erosion and Sediment Control)

• Townsville rainfall intensity (1yr, 120hr) = 1.92 mm/hr (as per Table B5 – Best Practice Erosion and Sediment Control)

• Default 5-day rainfall depth = 57.1 mm (85th%) (as per Table B5 – Best Practice Erosion and Sediment Control)

• The Job Site is described as Sandy Loam so a runoff coefficient of 0.48 will be adopted. (as per Table B7 – Best Practice Erosion and Sediment Control)

• Sediment Storage Volume for Type D = 50% of Settling Volume

• Adopt a Sediment Pond Depth 3m

o Settling Zone Height of 1.6m (minimum 600mm)

o Sediment Storage Zone Height of 1.4m

Minimum Volume of the upper settling zone is defined by:

Vs = 10. R(y%,5-day).Cv.A

Where:

Vs = Volume of the settling Zone (m3)

R(Y%,5-day) = Y%, five day rainfall depth (mm)

Cv = Volumetric runoff co-efficient

A = Effective catchment surface area connected to the basin (Ha)


Sediment Basin ASediment Basin ASediment Basin ASediment Basin A

• Catchment Area = 2.7 Ha

Sizing of Sett lement ZoneSizing of Sett lement ZoneSizing of Sett lement ZoneSizing of Sett lement Zone

Vs = 10 x 57.1 x 0.48 x 2.7

Vs = 740 m3

Sizing of Sediment StorageSizing of Sediment StorageSizing of Sediment StorageSizing of Sediment Storage

740 m3 x 50%= 370m3

Sizing of Sediment BasinSizing of Sediment BasinSizing of Sediment BasinSizing of Sediment Basin

Total Storage Volume = 740 + 370 = 1110 m3

Length to Width Ratio = 1:3

Adopted Length = 34m

Adopted Width = 11m

Adopted Depth = 3m

Due to the adopted Depth – Fencing is required to be installed around the

perimeter of the sediment basin for safety reasons.


Sediment Basin BSediment Basin BSediment Basin BSediment Basin B

• Catchment Area = 3.2 Ha

Sizing of Sett lement ZoneSizing of Sett lement ZoneSizing of Sett lement ZoneSizing of Sett lement Zone

Vs = 10 x 57.1 x 0.48 x 3.2

Vs = 877 m3

Sizing of Sediment StorageSizing of Sediment StorageSizing of Sediment StorageSizing of Sediment Storage

877 m3 x 50%= 439 m3

Sizing of Sediment BasinSizing of Sediment BasinSizing of Sediment BasinSizing of Sediment Basin

Total Storage Volume = 877 + 439 = 1316 m3

Length to Width Ratio = 1:3

Adopted Length = 37m

Adopted Width = 12m

Adopted Depth = 3m

Due to the adopted Depth – Fencing is required to be installed around the

perimeter of the sediment basin for safety reasons.

5


APPENDIXAPPENDIXAPPENDIXAPPENDIX EEEE::::

IIIINSPECTION NSPECTION NSPECTION NSPECTION TTTTEST EST EST EST PPPPLANLANLANLAN

Appendix E | N

ove

mber 2010

INSPECTION AND TEST PLANINSPECTION AND TEST PLANINSPECTION AND TEST PLANINSPECTION AND TEST PLAN

Construction Activity

Specification Description

Item Number

To be installed To be removed Hold Point (Yes/N

o)

Date Hold/Witness Point Signature

Construction

Exit

SD-ESC ESCa Start of Project Upon Primer Sealing

of all Roadways

Yes

Construction

Exit

SD-ESC ESCb Start of Project Upon Primer Sealing

of all Roadways

Yes

Diversion

Channel

SD-TRM DC01 Start of Project Just prior to Stage 3 Yes

Catch Drain SD-CD CD01 Start of Project Just prior to Stage 3 Yes






Sediment Basin SD-SB SB01 Start of Project Just prior to Stage 3 Yes

Sediment Basin SD-SB SB02 Start of Project Just prior to Stage 3 Yes

Rock

Protection

MRS11.03 RP01 Start of Project Permanent Yes

Appendix E | N

ove

mber 2010

Silt Fencing SD-SF SF01 Start of Project After Completion of

project

Yes

Silt Fencing SD-SF SF02 Start of Project After Completion of

project

Yes

Kerb Inlet

Sediment Trap

SD-ESC ESC1 Immediately after

installation of Kerb

Inlet

After Completion of

project

Yes

Kerb Inlet

Sediment Trap



Inlet

After Completion of

project

Yes

Kerb Inlet

Sediment Trap



Inlet

After Completion of

project

Yes

Kerb Inlet

Sediment Trap



Inlet

After Completion of

project

Yes

Kerb Inlet

Sediment Trap



Inlet

After Completion of

project

Yes

Kerb Inlet

Sediment Trap



Inlet

After Completion of

project

Yes

6


APPENDIXAPPENDIXAPPENDIXAPPENDIX FFFF::::

MMMMOOOONITORING NITORING NITORING NITORING CCCCHECKLISTHECKLISTHECKLISTHECKLIST

Appendix F | November 2010

Weekly Site InspectionWeekly Site InspectionWeekly Site InspectionWeekly Site Inspection

LOCATIONLOCATIONLOCATIONLOCATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

INSPECTION OFFICERINSPECTION OFFICERINSPECTION OFFICERINSPECTION OFFICER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . DATEDATEDATEDATE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SIGNATURESIGNATURESIGNATURESIGNATURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ....

I temItemItemItem ConsiderationConsiderationConsiderationConsideration AssessAssessAssessAssessmmmmentententent

1 Public roadways clear of sediment. . . . . . . . . . . .

2 Entry/exit pads clear of excessive sediment deposition. . . . . . . . . . . .

3 Entry/exit pads have adequate void spacing to trap sediment.

. . . . . . . . . . .

4 The construction site is clear of litter and unconfined rubbish. . . . . . . . . . . .

5 Adequate stockpiles of emergency ESC materials exist on site.

. . . . . . . . . . .

6 Site dust is being adequately controlled. . . . . . . . . . . .

7 Appropriate drainage and sediment controls have been installed prior to new areas being cleared or disturbed.

. . . . . . . . . . .

8 Up-slope “clean” water is being appropriately diverted around/through the site.

. . . . . . . . . . .

9 Drainage lines are free of soil scour and sediment deposition.

. . . . . . . . . . .

10 No areas of exposed soil are in need of erosion control. . . . . . . . . . . .

11 Earth batters are free of “rill” erosion. . . . . . . . . . . .

12 Erosion control mulch is not being displaced by wind or water.

. . . . . . . . . . .

13 Long-term soil stockpiles are protected from wind, rain and stormwater flow with appropriate drainage and erosion controls.

. . . . . . . . . . .

14 Sediment fences are free from damage. . . . . . . . . . . .

15 Sediment-laden stormwater is not simply flowing “around” the sediment fences or other sediment traps.

. . . . . . . . . . .

16 Sediment controls placed up-slope/around stormwater inlets are appropriate for the type of inlet structure.

. . . . . . . . . . .

17 All sediment traps are free of excessive sediment deposition. . . . . . . . . . . .

18 The settled sediment layer within a sediment basin is clearly

Appendix F | November 2010

visible through the supernatant prior to discharge such water.

. . . . . . . . . . .

19 All reasonable and practicable measures are being taken to control sediment runoff from the site.

. . . . . . . . . . .

20 All soil surfaces are being appropriately prepared (i.e. pH, nutrients, roughness and density) prior to revegetation.

. . . . . . . . . . .

21 Stabilised surfaces have a minimum 70% soil coverage. . . . . . . . . . . .

22 The site is adequately prepared for imminent storms. . . . . . . . . . . .

23 All ESC measures are in proper working order. . . . . . . . . . . .

7


APPENDIXAPPENDIXAPPENDIXAPPENDIX G:G:G:G:

TCCTCCTCCTCC PPPPLAN LAN LAN LAN EEEEVALUATION VALUATION VALUATION VALUATION SSSSHEETHEETHEETHEET

Appendix G | November 2010

Townsville City CouncilTownsville City CouncilTownsville City CouncilTownsville City Council

Draft Soil Erosion and Sediment Control Plan: ChecklistDraft Soil Erosion and Sediment Control Plan: ChecklistDraft Soil Erosion and Sediment Control Plan: ChecklistDraft Soil Erosion and Sediment Control Plan: Checklist

Project Name:Project Name:Project Name:Project Name: Proposed 32 Lot Subdivision

Site Address:Site Address:Site Address:Site Address: GIFFORD STREET, HORSESHOE BAY

Name of the 'Qualified Professional' submitting this form: Karl Adebahr

Company / Business name: Kaos Konsulting

Address: 12 Empire Street, Coruscant

Phone: TCC ESC Accreditation no.: 123456789

Responsible Person: Mace Windu

TCC ESC Accreditation no.: 987654321

Trained Site Foreman: Mon Mothma

TCC ESC Accreditation no.: 456789123

I temItemItemItem Qualif icationQualif icationQualif icationQualif ication (where appropriate)(where appropriate)(where appropriate)(where appropriate)

1111

A summary statement is provided of the scope of the work to be performed. �

2222

The plan shows project site boundaries, easement boundaries, adjoining roadways, a scale, north direction, and a legend using standard ESC symbols.

�

3333

Existing topographic contours over the site and existing water movement pathways are shown on a plan.

�

4444

Locations of stabilised construction access points and associated drainage and sediment controls are shown.

�

5555

Locations of site office, car park(s), and stockpiles and associated drainage and sediment controls are shown.

�


6666

Proposed limits of disturbance during construction activities; fencing or other protection provided for non-disturbance areas; remnant ground cover vegetation, trees, and grass buffer zones specified.

�

7777

Locations of areas of high erosion risk and/or critical environmental values are shown. N/A

8888

Evidence is provided that a site risk assessment has been completed, including the time of disturbance relative to climatic, soil, and site conditions; earthworks are avoided during the wet season; site earthworks are staged to minimise the impact of site disturbance; a design storm and local background water quality have been considered in the design.

�

9999

Site preparation, initial land clearing, and topsoil handling strategies are described, including ESC controls to be installed prior to disturbance.

�

10101010

General soil description as identified from published soil maps used in the soil investigation for the site; evidence that acid sulphate soils have been considered.

�

11111111

Local soil types are provided, identifying the limitations of both topsoils and subsoils determined through soil testing; soil test result sheets are appended for chemical analyses of topsoil and subsoil samples.

�

12121212

Evidence is provided that areas of potentially problem topsoils and subsoils have been considered in the design, including strategies to deal with: steep slopes, saline soils, dispersive soils, and strongly acidic or alkaline soils.

�

Drainage, erosion, and sediment control Drainage, erosion, and sediment control Drainage, erosion, and sediment control Drainage, erosion, and sediment control measures required:measures required:measures required:measures required:

13131313

A unique identifying code has been assigned to each ESC structure (to be shown on the plan and used as labels at the site)

�

14141414

Clean water is diverted around the site; clean and contaminated water flowing over the site are separated; temporary and permanent drainage and erosion controls are specified; stormwater is diverted away from site entrances and exits; use of hay bales is minimised / avoided.

�


15151515

Measures to control drainage discharge from the site have been specified. Site plans must show that no water flowing across a disturbed surface is allowed to leave the site without passing through a sediment control structure or process. Sediment basins, sediment fences, or other measures have been specified to trap sediment on site; by-pass flows from sediment control structures are discharged onto stable areas; access to ESC structures is specified for sediment removal and maintenance; flocculants are specified for dispersive soil materials trapped in sediment basins.

�

16161616

Construction and drainage plans are provided for each stage of site works, including: locations of cut and fill areas, temporary or permanent sediment basins, modifications to site contours and water movement pathways, and incorporation of temporary measures into the permanent drainage layout.

�

17171717

Full design and construction details (e.g. minimum channel grades, water velocities, channel linings, basin sizes, ...) are specified for all ESC measures, including calculation sheets for the sizing of erosion and sediment control measures.

�

18181818

An Implementation Schedule is given, specifying the timeframe and sequence of works to be carried out. The Schedule includes: the layout and staging of proposed works to minimise the area and duration of exposure of disturbed surfaces; the installation and removal sequences for all ESC measures; hold and end points nominated for each measure; areas requiring temporary cover or revegetation during construction delays.

�

19191919

Specifications are included for temporary erosion and sediment control measures to be adopted: dust suppression techniques to be used during construction; measures to be installed at the end of each working day; measures to be used in case of impending storms or emergency situations; temporary stabilising measures (mulching, revegetation, or other) for disturbed surfaces if work is delayed on those surfaces for more than 14 days.

�


Site revegetation, rehabil itation, Site revegetation, rehabil itation, Site revegetation, rehabil itation, Site revegetation, rehabil itation, maintenance, and monitorimaintenance, and monitorimaintenance, and monitorimaintenance, and monitoring ng ng ng requirements:requirements:requirements:requirements:

20202020

A Progressive Site Revegetation and Rehabilitation Plan is included, listing methods for: topsoi placement, depth, and amendments (if needed); subsoil management; selection of grass, legume, or other plant varieties; planting methods; rates are given for seeding, fertiliser, irrigation, mulch, and other planting and establishment strategies to be used.

�

21212121

A Site Maintenance Plan is included listing performance standards for temporary and permanent ESC structures and the maintenance of vegetation covers (e.g. irrigation, weeding, fertilising, …).

�

22222222

A Plan for Monitoring Site Condition is provided for a nominated period after the construction phase, including: a draft Inspection Test Plan for assessing the erosional status of all disturbed lands; the condition of ESC structures; the discharge water quality target specified (e.g. suspended sediment load less than 250 mg/L), locations of discharge water monitoring stations; measures of revegetation success.

�

OperationalOperationalOperationalOperational requirements: requirements: requirements: requirements:

23232323

Statements of Intent are included for key operations �

24242424

A 'Qualified Professional', accredited by Townsville City Council, has been nominated to prepare the ESC plan, provide on-going advice, approve of any changes required in the Plan, act as the principal contact with Council, and fulfil reporting requirements.

�

25252525

A 'Responsible Person' has been nominated to be accountable for the on-site implementation of the ESC Plan, monitors site activities, and expends funds for installation, emergency repair, and upgrade of ESC works, as required. This person will normally be the Project Manager, land developer, or site owner.

�


26262626

A 'Trained Site Foreman', accredited by Townsville City Council, has been nominated to oversee the installation and maintenance of all ESC works, prepares for wet weather, and reports to the Responsible Person on potential erosion risks and active erosion hazards at the site.

�

27272727

A Contingency Fund (minimum of $3000 per incident) has been established to cover the cost of emergency repairs to ESC measures.

�

28282828

Hold Points and End Points are defined and list the personnel or site management roles involved; verification methods (photo, site inspection, …) have been specified.

�

29292929

A checklist for Weekly Site Inspections is provided. �

30303030

A mechanism has been set in place to provide Monthly Reports to Townsville City Council by the ‘Qualified Professional’, in consultation with the ‘Responsible Person’.

�

31313131

A Completion Report will be submitted to Townsville City Council by the ‘Qualified Professional’ in consultation with the ‘Responsible Person’.

�

32323232

Any other relevant information required by Townsville City Council has been provided in order to alliow a proper assessment of this Erosion and Sediment Control Plan.

�

I have reviewed the attached Erosion and Sediment Control Plan. I certify that it meets the above key requirements (with stated qualifications, where appropriate).

Signature: ………………………………………………….…………………..

Name: ……………………………………………………………………..……

Townsville City Council ESC accreditation number: ……123456789…

Documents

Erosion and Sediment Control Plan - Creek to Coral Plan2010.pdf · The Erosion and Sediment Control Plan should consider a method of stabilising the structure(s) used to conduct the